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vuln-cve/data/2026/21xxx/CVE-2026-21921.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-21921",
"assignerOrgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968",
"state": "PUBLISHED",
"assignerShortName": "juniper",
"dateReserved": "2026-01-05T17:32:48.712Z",
"datePublished": "2026-01-15T20:28:29.656Z",
"dateUpdated": "2026-01-15T20:55:25.182Z"
},
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Junos OS",
"vendor": "Juniper Networks",
"versions": [
{
"lessThan": "22.4R3-S8",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "23.2R2-S5",
"status": "affected",
"version": "23.2",
"versionType": "semver"
},
{
"lessThan": "23.4R2",
"status": "affected",
"version": "23.4",
"versionType": "semver"
}
]
},
{
"defaultStatus": "unaffected",
"product": "Junos OS Evolved",
"vendor": "Juniper Networks",
"versions": [
{
"lessThan": "22.4R3-S8-EVO",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "23.2R2-S5-EVO",
"status": "affected",
"version": "23.2",
"versionType": "semver"
},
{
"lessThan": "23.4R2-EVO",
"status": "affected",
"version": "23.4",
"versionType": "semver"
}
]
}
],
"configurations": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "A device is only exposed to this issue if GRPC services are configured:<br><br><tt>[ system services extension-service request-response grpc ]</tt>\n\n<br>"
}
],
"value": "A device is only exposed to this issue if GRPC services are configured:\n\n[ system services extension-service request-response grpc ]"
}
],
"datePublic": "2026-01-14T17:00:00.000Z",
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "A Use After Free vulnerability in the chassis daemon (chassisd) of Juniper Networks Junos OS and Junos OS Evolved allows a network-based attacker authenticated with low privileges to cause a Denial-of-Service (DoS).<br><br>When telemetry collectors are frequently subscribing and unsubscribing to sensors continuously over a long period of time, telemetry-capable processes like chassisd, rpd or mib2d will crash and restart, which - depending on the process - can cause a complete outage until the system has recovered.<br><br><p>This issue affects:</p><p>&nbsp;Junos OS:&nbsp;</p><p></p><ul><li>all versions before 22.4R3-S8,</li><li>23.2 versions before 23.2R2-S5,</li><li>23.4 versions before 23.4R2;</li></ul><p></p><p>Junos OS Evolved:</p><p></p><ul><li>all versions before 22.4R3-S8-EVO,</li><li>23.2 versions before 23.2R2-S5-EVO,</li><li>23.4 versions before 23.4R2-EVO.</li></ul><p></p>"
}
],
"value": "A Use After Free vulnerability in the chassis daemon (chassisd) of Juniper Networks Junos OS and Junos OS Evolved allows a network-based attacker authenticated with low privileges to cause a Denial-of-Service (DoS).\n\nWhen telemetry collectors are frequently subscribing and unsubscribing to sensors continuously over a long period of time, telemetry-capable processes like chassisd, rpd or mib2d will crash and restart, which - depending on the process - can cause a complete outage until the system has recovered.\n\nThis issue affects:\n\n Junos OS: \n\n\n\n * all versions before 22.4R3-S8,\n * 23.2 versions before 23.2R2-S5,\n * 23.4 versions before 23.4R2;\n\n\n\n\nJunos OS Evolved:\n\n\n\n * all versions before 22.4R3-S8-EVO,\n * 23.2 versions before 23.2R2-S5-EVO,\n * 23.4 versions before 23.4R2-EVO."
}
],
"exploits": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."
}
],
"value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
},
{
"cvssV4_0": {
"Automatable": "YES",
"Recovery": "AUTOMATIC",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"privilegesRequired": "LOW",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "LOW",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/RE:M",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "MODERATE"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-416",
"description": "CWE-416 Use After Free",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"orgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968",
"shortName": "juniper",
"dateUpdated": "2026-01-15T20:28:29.656Z"
},
"references": [
{
"tags": [
"vendor-advisory"
],
"url": "https://supportportal.juniper.net/JSA106021"
},
{
"tags": [
"vendor-advisory"
],
"url": "https://kb.juniper.net/JSA106021"
}
],
"solutions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "The following software releases have been updated to resolve this specific issue:<br>Junos OS Evolved: 22.4R3-S8-EVO, 23.2R2-S5-EVO, 23.4R2-EVO, 24.2R1-EVO,&nbsp;and all subsequent releases;<br>Junos OS: 22.4R3-S8, 23.2R2-S5, 23.4R2, 24.2R1, and all subsequent releases."
}
],
"value": "The following software releases have been updated to resolve this specific issue:\nJunos OS Evolved: 22.4R3-S8-EVO, 23.2R2-S5-EVO, 23.4R2-EVO, 24.2R1-EVO, and all subsequent releases;\nJunos OS: 22.4R3-S8, 23.2R2-S5, 23.4R2, 24.2R1, and all subsequent releases."
}
],
"source": {
"advisory": "JSA106021",
"defect": [
"1791928"
],
"discovery": "INTERNAL"
},
"title": "Junos OS and Junos OS Evolved: When telemetry collectors are frequently subscribing and unsubscribing to sensors chassisd or rpd will crash",
"workarounds": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "There are no known workarounds for this issue."
}
],
"value": "There are no known workarounds for this issue."
}
],
"x_generator": {
"engine": "Vulnogram 0.1.0-dev"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-01-15T20:54:58.001808Z",
"id": "CVE-2026-21921",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-01-15T20:55:25.182Z"
}
}
]
}
}
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