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vuln-cve/data/2026/21xxx/CVE-2026-21911.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-21911",
"assignerOrgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968",
"state": "PUBLISHED",
"assignerShortName": "juniper",
"dateReserved": "2026-01-05T17:32:48.710Z",
"datePublished": "2026-01-15T20:23:54.924Z",
"dateUpdated": "2026-01-15T20:51:32.531Z"
},
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Junos OS Evolved",
"vendor": "Juniper Networks",
"versions": [
{
"lessThan": "21.4R3-S7-EVO",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "22.2R3-S4-EVO",
"status": "affected",
"version": "22.2",
"versionType": "semver"
},
{
"lessThan": "22.3R3-S3-EVO",
"status": "affected",
"version": "22.3",
"versionType": "semver"
},
{
"lessThan": "22.4R3-S2-EVO",
"status": "affected",
"version": "22.4",
"versionType": "semver"
},
{
"lessThan": "23.2R2-S1-EVO",
"status": "affected",
"version": "23.2",
"versionType": "semver"
},
{
"lessThan": "23.4R1-S2-EVO, 23.4R2-EVO",
"status": "affected",
"version": "23.4",
"versionType": "semver"
}
]
}
],
"configurations": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "This issue affects label-switched interfaces configured for VPLS. For example:<br><br><tt>[routing-instances &lt;name&gt; instance-type vpls]<br>[routing-instances &lt;name&gt; protocols vpls]</tt>"
}
],
"value": "This issue affects label-switched interfaces configured for VPLS. For example:\n\n[routing-instances <name> instance-type vpls]\n[routing-instances <name> protocols vpls]"
}
],
"datePublic": "2026-01-14T17:00:00.000Z",
"descriptions": [
{
"lang": "en",
"supportingMedia": [
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"type": "text/html",
"value": "<span style=\"background-color: rgb(255, 255, 255);\">An Incorrect Calculation vulnerability in the Layer 2 Control\n\n<span style=\"background-color: rgb(255, 255, 255);\">Protocol </span>\n\n Daemon (l2cpd) of Juniper Networks Junos OS Evolved allows an unauthenticated network-adjacent attacker flapping the management interface to cause the learning of new MACs over label-switched interfaces (LSI) to stop while generating a&nbsp;</span>flood of logs, resulting in high CPU usage.<br><br>When the issue is seen, the following log message will be generated:<br><br><tt>op:1 flag:0x6 mac:xx:xx:xx:xx:xx:xx bd:2 ifl:13302 reason:0(REASON_NONE) i-op:6(INTRNL_OP_HW_FORCE_DELETE) status:10 lstatus:10 err:26(GETIFBD_VALIDATE_FAILED) err-reason 4(IFBD_VALIDATE_FAIL_EPOCH_MISMATCH) hw_wr:0x4 ctxsync:0 fwdsync:0 rtt-id:51 p_ifl:0 fwd_nh:0 svlbnh:0 event:- smask:0x100000000 dmask:0x0 mplsmask 0x1 act:0x5800 extf:0x0 pfe-id 0 hw-notif-ifl 13302 programmed-ifl 4294967295 pseudo-vtep underlay-ifl-idx 0 stack:GET_MAC, ALLOCATE_MAC, GET_IFL, GET_IFF, GET_IFBD, STOP,</tt> <p><br></p><p>This issue affects Junos OS Evolved:&nbsp;</p><ul><li>all versions before 21.4R3-S7-EVO,&nbsp;</li><li>from 22.2 before 22.2R3-S4-EVO,&nbsp;</li><li>from 22.3 before 22.3R3-S3-EVO,&nbsp;</li><li>from 22.4 before 22.4R3-S2-EVO,&nbsp;</li><li>from 23.2 before 23.2R2-S1-EVO,&nbsp;</li><li>from 23.4 before 23.4R1-S2-EVO, 23.4R2-EVO.</li></ul>"
}
],
"value": "An Incorrect Calculation vulnerability in the Layer 2 Control\n\nProtocol \n\n Daemon (l2cpd) of Juniper Networks Junos OS Evolved allows an unauthenticated network-adjacent attacker flapping the management interface to cause the learning of new MACs over label-switched interfaces (LSI) to stop while generating a flood of logs, resulting in high CPU usage.\n\nWhen the issue is seen, the following log message will be generated:\n\nop:1 flag:0x6 mac:xx:xx:xx:xx:xx:xx bd:2 ifl:13302 reason:0(REASON_NONE) i-op:6(INTRNL_OP_HW_FORCE_DELETE) status:10 lstatus:10 err:26(GETIFBD_VALIDATE_FAILED) err-reason 4(IFBD_VALIDATE_FAIL_EPOCH_MISMATCH) hw_wr:0x4 ctxsync:0 fwdsync:0 rtt-id:51 p_ifl:0 fwd_nh:0 svlbnh:0 event:- smask:0x100000000 dmask:0x0 mplsmask 0x1 act:0x5800 extf:0x0 pfe-id 0 hw-notif-ifl 13302 programmed-ifl 4294967295 pseudo-vtep underlay-ifl-idx 0 stack:GET_MAC, ALLOCATE_MAC, GET_IFL, GET_IFF, GET_IFBD, STOP, \n\n\nThis issue affects Junos OS Evolved: \n\n * all versions before 21.4R3-S7-EVO, \n * from 22.2 before 22.2R3-S4-EVO, \n * from 22.3 before 22.3R3-S3-EVO, \n * from 22.4 before 22.4R3-S2-EVO, \n * from 23.2 before 23.2R2-S1-EVO, \n * from 23.4 before 23.4R1-S2-EVO, 23.4R2-EVO."
}
],
"exploits": [
{
"lang": "en",
"supportingMedia": [
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"type": "text/html",
"value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."
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],
"value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/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": "ADJACENT",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"privilegesRequired": "NONE",
"providerUrgency": "AMBER",
"subAvailabilityImpact": "LOW",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "CONCENTRATED",
"vectorString": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/V:C/RE:M/U:Amber",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "MODERATE"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
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],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-682",
"description": "CWE-682 Incorrect Calculation",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"orgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968",
"shortName": "juniper",
"dateUpdated": "2026-01-15T20:23:54.924Z"
},
"references": [
{
"tags": [
"vendor-advisory"
],
"url": "https://supportportal.juniper.net/JSA106010"
},
{
"tags": [
"vendor-advisory"
],
"url": "https://kb.juniper.net/JSA106010"
}
],
"solutions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "The following software releases have been updated to resolve this specific issue: 21.4R3-S7-EVO, 22.2R3-S4-EVO, 22.3R3-S3-EVO, 22.4R3-S2-EVO, 23.2R2-S1-EVO, 23.4R1-S2-EVO, 23.4R2-EVO, 24.2R1-EVO, and all subsequent releases."
}
],
"value": "The following software releases have been updated to resolve this specific issue: 21.4R3-S7-EVO, 22.2R3-S4-EVO, 22.3R3-S3-EVO, 22.4R3-S2-EVO, 23.2R2-S1-EVO, 23.4R1-S2-EVO, 23.4R2-EVO, 24.2R1-EVO, and all subsequent releases."
}
],
"source": {
"advisory": "JSA106010",
"defect": [
"1802153"
],
"discovery": "USER"
},
"title": "Junos OS Evolved: Flapping management interface causes MAC learning on label-switched interfaces to stop",
"workarounds": [
{
"lang": "en",
"supportingMedia": [
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"base64": false,
"type": "text/html",
"value": "There are no known workarounds for this issue.<br>"
}
],
"value": "There are no known workarounds for this issue."
}
],
"x_generator": {
"engine": "Vulnogram 0.1.0-dev"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-01-15T20:51:26.965443Z",
"id": "CVE-2026-21911",
"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": "2026-01-15T20:51:32.531Z"
}
}
]
}
}
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