282 lines
14 KiB
JSON
282 lines
14 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-21901",
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"assignerOrgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968",
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"state": "PUBLISHED",
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"assignerShortName": "juniper",
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"dateReserved": "2026-01-05T17:32:48.709Z",
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"datePublished": "2026-07-09T21:01:31.334Z",
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"dateUpdated": "2026-07-10T14:21:31.624Z"
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},
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"containers": {
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"cna": {
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"affected": [
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{
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"defaultStatus": "unaffected",
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"product": "Junos OS",
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"vendor": "Juniper Networks",
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"versions": [
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{
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"lessThan": "22.3R3-S5",
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"status": "affected",
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"version": "22.3",
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"versionType": "custom"
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},
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{
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"lessThan": "22.4R3-S10",
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"status": "affected",
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"version": "22.4",
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"versionType": "custom"
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},
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{
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"lessThan": "23.2R2-S7",
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"status": "affected",
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"version": "23.2",
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"versionType": "custom"
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},
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{
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"lessThan": "23.4R2-S8",
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"status": "affected",
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"version": "23.4",
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"versionType": "custom"
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},
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{
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"lessThan": "22.3R1",
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"status": "unaffected",
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"version": "0",
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"versionType": "custom"
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}
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]
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},
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{
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"defaultStatus": "unaffected",
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"product": "Junos OS Evolved",
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"vendor": "Juniper Networks",
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"versions": [
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{
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"lessThan": "23.2R2-S7-EVO",
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"status": "affected",
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"version": "23.2",
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"versionType": "custom"
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},
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{
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"lessThan": "23.4R2-S8-EVO",
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"status": "affected",
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"version": "23.4",
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"versionType": "custom"
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},
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{
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"lessThan": "22.3R1-EVO",
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"status": "unaffected",
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"version": "0",
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"versionType": "custom"
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}
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]
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}
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],
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"credits": [
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{
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"lang": "en",
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"type": "finder",
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"value": "Juniper SIRT would like to acknowledge and thank Orange CERT-CC from the Orange group for responsibly reporting this vulnerability."
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}
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],
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"datePublic": "2026-07-08T16:00:00.000Z",
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"descriptions": [
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "A NULL Pointer Dereference vulnerability in the management daemon (mgd) of Juniper Networks Junos OS and Junos OS Evolved allows a local, high-privileged attacker setting or deactivating a specific SSH configuration parameter to create a Denial of Service (DoS).<br><br>A local high-privileged user configuring or deactivating a specific 'system services ssh' configuration parameter can exploit a null pointer dereference in one of the functions used by SSH. The function attempts to dereference a null pointer when accessing certain configuration data, resulting in an mgd process crash and restart. Continued execution of these configuration commands will create a sustained Denial of Service (DoS) condition.<br><p><br>This issue affects:<br>Junos OS:<br></p><ul><li>from 22.3 before 22.3R3-S5;</li><li>from 22.4 before 22.4R3-S10;</li><li>from 23.2 before 23.2R2-S7;</li><li>from 23.4 before 23.4R2-S8.</li></ul>\n\nThis issue does not affect Junos OS before 22.3R1.\n\n<br><br>Junos OS Evolved:<br><ul><li>from 22.3R1-EVO before 23.2R2-S7-EVO;</li><li>from 23.4 before 23.4R2-S8-EVO.</li></ul>This issue does not affect Junos OS Evolved before 22.3R1-EVO.<p></p>"
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}
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],
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"value": "A NULL Pointer Dereference vulnerability in the management daemon (mgd) of Juniper Networks Junos OS and Junos OS Evolved allows a local, high-privileged attacker setting or deactivating a specific SSH configuration parameter to create a Denial of Service (DoS).\n\nA local high-privileged user configuring or deactivating a specific 'system services ssh' configuration parameter can exploit a null pointer dereference in one of the functions used by SSH. The function attempts to dereference a null pointer when accessing certain configuration data, resulting in an mgd process crash and restart. Continued execution of these configuration commands will create a sustained Denial of Service (DoS) condition.\n\nThis issue affects:\nJunos OS:\n\n\n * from 22.3 before 22.3R3-S5;\n * from 22.4 before 22.4R3-S10;\n * from 23.2 before 23.2R2-S7;\n * from 23.4 before 23.4R2-S8.\n\n\n\n\nThis issue does not affect Junos OS before 22.3R1.\n\n\n\nJunos OS Evolved:\n * from 22.3R1-EVO before 23.2R2-S7-EVO;\n * from 23.4 before 23.4R2-S8-EVO.\n\n\nThis issue does not affect Junos OS Evolved before 22.3R1-EVO."
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}
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],
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"exploits": [
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."
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}
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],
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"value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"attackComplexity": "LOW",
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"attackVector": "LOCAL",
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"availabilityImpact": "HIGH",
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"baseScore": 4.4,
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"baseSeverity": "MEDIUM",
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"confidentialityImpact": "NONE",
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"integrityImpact": "NONE",
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"privilegesRequired": "HIGH",
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"scope": "UNCHANGED",
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"userInteraction": "NONE",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H",
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"version": "3.1"
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},
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"format": "CVSS",
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"scenarios": [
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{
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"lang": "en",
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"value": "GENERAL"
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}
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]
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},
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{
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"cvssV4_0": {
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"Automatable": "YES",
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"Recovery": "AUTOMATIC",
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"Safety": "NOT_DEFINED",
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"attackComplexity": "LOW",
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"attackRequirements": "NONE",
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"attackVector": "LOCAL",
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"baseScore": 6.7,
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"baseSeverity": "MEDIUM",
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"privilegesRequired": "HIGH",
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"providerUrgency": "GREEN",
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"subAvailabilityImpact": "NONE",
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"subConfidentialityImpact": "NONE",
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"subIntegrityImpact": "NONE",
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"userInteraction": "NONE",
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"valueDensity": "DIFFUSE",
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"vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/AU:Y/R:A/V:D/RE:M/U:Green",
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"version": "4.0",
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"vulnAvailabilityImpact": "HIGH",
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"vulnConfidentialityImpact": "NONE",
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"vulnIntegrityImpact": "NONE",
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"vulnerabilityResponseEffort": "MODERATE"
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},
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"format": "CVSS",
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"scenarios": [
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{
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"lang": "en",
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"value": "GENERAL"
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}
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]
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"cweId": "CWE-476",
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"description": "CWE-476 NULL Pointer Dereference",
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"lang": "en",
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"type": "CWE"
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}
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]
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}
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],
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"providerMetadata": {
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"orgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968",
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"shortName": "juniper",
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"dateUpdated": "2026-07-09T21:01:31.334Z"
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},
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"references": [
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{
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"tags": [
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"third-party-advisory"
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],
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"url": "https://github.com/orangecertcc/security-research/security/advisories/GHSA-g4f7-w2rc-hpj6"
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},
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{
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"tags": [
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"vendor-advisory"
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],
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"url": "https://supportportal.juniper.net/JSA110072"
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}
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],
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"solutions": [
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "The following software releases have been updated to resolve this specific issue:<br>Junos OS: 22.3R3-S5, 22.4R3-S10, 23.2R2-S7, 23.4R2-S8, 24.2R1, and all subsequent releases.\n<br>\nJunos OS Evolved: 23.2R2-S7-EVO, 23.4R2-S8-EVO, 24.2R1-EVO, and all subsequent releases."
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}
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],
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"value": "The following software releases have been updated to resolve this specific issue:\nJunos OS: 22.3R3-S5, 22.4R3-S10, 23.2R2-S7, 23.4R2-S8, 24.2R1, and all subsequent releases.\n\n\nJunos OS Evolved: 23.2R2-S7-EVO, 23.4R2-S8-EVO, 24.2R1-EVO, and all subsequent releases."
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}
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],
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"source": {
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"advisory": "JSA110072",
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"defect": [
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"1779319"
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],
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"discovery": "EXTERNAL"
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},
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"title": "Junos OS and Junos OS Evolved: Configuration of a specific SSH option results in mgd crash",
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"workarounds": [
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "<span style=\"background-color: rgb(255, 255, 255);\">There are no direct workarounds for this issue.<br><br>\n\n<span style=\"background-color: rgb(255, 255, 255);\">One of the following mitigations will prevent malicious exploitation:</span><br><ul></ul><ul></ul><ul><li>Use access lists or firewall filters to limit access to the CLI only from trusted hosts and administrators.</li><li>Utilize command authorization to limit the ability to enter config mode to trusted administrators.</li></ul></span>"
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}
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],
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"value": "There are no direct workarounds for this issue.\n\n\n\nOne of the following mitigations will prevent malicious exploitation:\n\n\n\n\n * Use access lists or firewall filters to limit access to the CLI only from trusted hosts and administrators.\n * Utilize command authorization to limit the ability to enter config mode to trusted administrators."
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}
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],
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"x_generator": {
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"engine": "Vulnogram 0.1.0-dev"
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}
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},
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"adp": [
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{
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"references": [
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{
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"url": "https://github.com/orangecertcc/security-research/security/advisories/GHSA-g4f7-w2rc-hpj6",
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"tags": [
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"exploit"
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]
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}
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],
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-07-10T14:21:27.704515Z",
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"id": "CVE-2026-21901",
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"options": [
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{
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"Exploitation": "poc"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-07-10T14:21:31.624Z"
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}
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}
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]
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}
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} |