CVE-2026-21908 (GCVE-0-2026-21908)
Vulnerability from cvelistv5
Published
2026-01-15 20:21
Modified
2026-02-26 15:04
CWE
Summary
A Use After Free vulnerability was identified in the 802.1X authentication daemon (dot1xd) of Juniper Networks Junos OS and Junos OS Evolved that could allow an authenticated, network-adjacent attacker flapping a port to crash the dot1xd process, leading to a Denial of Service (DoS), or potentially execute arbitrary code within the context of the process running as root. The issue is specific to the processing of a change in authorization (CoA) when a port bounce occurs. A pointer is freed but was then referenced later in the same code path. Successful exploitation is outside the attacker's direct control due to the specific timing of the two events required to execute the vulnerable code path. This issue affects systems with 802.1X authentication port-based network access control (PNAC) enabled. This issue affects: Junos OS:  * from 23.2R2-S1 before 23.2R2-S5,  * from 23.4R2 before 23.4R2-S6,  * from 24.2 before 24.2R2-S3,  * from 24.4 before 24.4R2-S1,  * from 25.2 before 25.2R1-S2, 25.2R2;  Junos OS Evolved:  * from 23.2R2-S1 before 23.2R2-S5-EVO,  * from 23.4R2 before 23.4R2-S6-EVO,  * from 24.2 before 24.2R2-S3-EVO,  * from 24.4 before 24.4R2-S1-EVO,  * from 25.2 before 25.2R1-S2-EVO, 25.2R2-EVO.
References
Impacted products
Vendor Product Version
Juniper Networks Junos OS Version: 23.2R2-S1   
Version: 23.4R2   
Version: 24.2   
Version: 24.4   
Version: 25.2   
Create a notification for this product.
   Juniper Networks Junos OS Evolved Version: 23.2R2-S1   
Version: 23.4R2   
Version: 24.2   
Version: 24.4   
Version: 25.2   
Create a notification for this product.
Show details on NVD website


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Successful exploitation is outside the attacker\u0027s direct control due to the specific timing of the two events required to execute the vulnerable code path.\u003cbr\u003e\u003cbr\u003eThis issue affects systems with 802.1X authentication port-based network access control (PNAC) enabled.\u003cbr\u003e\u003cp\u003eThis issue affects:\u003c/p\u003e\u003cp\u003eJunos OS:\u0026nbsp;\u003c/p\u003e\u003cp\u003e\u003c/p\u003e\u003cul\u003e\u003cli\u003efrom 23.2R2-S1 before 23.2R2-S5,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 23.4R2 before 23.4R2-S6,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 24.2 before 24.2R2-S3,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 24.4 before 24.4R2-S1,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 25.2 before 25.2R1-S2, 25.2R2;\u0026nbsp;\u003c/li\u003e\u003c/ul\u003e\u003cp\u003e\u003c/p\u003e\u003cp\u003eJunos OS Evolved:\u0026nbsp;\u003c/p\u003e\u003cp\u003e\u003c/p\u003e\u003cul\u003e\u003cli\u003efrom 23.2R2-S1 before 23.2R2-S5-EVO,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 23.4R2 before 23.4R2-S6-EVO,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 24.2 before 24.2R2-S3-EVO,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 24.4 before 24.4R2-S1-EVO,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 25.2 before 25.2R1-S2-EVO, 25.2R2-EVO.\u003c/li\u003e\u003c/ul\u003e\u003cp\u003e\u003c/p\u003e\"}], \"value\": \"A Use After Free vulnerability was identified in the 802.1X authentication daemon (dot1xd) of\\u00a0Juniper Networks Junos OS and Junos OS Evolved that could allow an authenticated, network-adjacent attacker flapping a port to crash the dot1xd process, leading to a Denial of Service (DoS), or potentially execute arbitrary code within the context of the process running as root.\\n\\nThe issue is specific to the processing of a change in authorization (CoA) when a port bounce occurs. A pointer is freed but was then referenced later in the same code path. Successful exploitation is outside the attacker\u0027s direct control due to the specific timing of the two events required to execute the vulnerable code path.\\n\\nThis issue affects systems with 802.1X authentication port-based network access control (PNAC) enabled.\\nThis issue affects:\\n\\nJunos OS:\\u00a0\\n\\n\\n\\n  *  from 23.2R2-S1 before 23.2R2-S5,\\u00a0\\n  *  from 23.4R2 before 23.4R2-S6,\\u00a0\\n  *  from 24.2 before 24.2R2-S3,\\u00a0\\n  *  from 24.4 before 24.4R2-S1,\\u00a0\\n  *  from 25.2 before 25.2R1-S2, 25.2R2;\\u00a0\\n\\n\\n\\n\\nJunos OS Evolved:\\u00a0\\n\\n\\n\\n  *  from 23.2R2-S1 before 23.2R2-S5-EVO,\\u00a0\\n  *  from 23.4R2 before 23.4R2-S6-EVO,\\u00a0\\n  *  from 24.2 before 24.2R2-S3-EVO,\\u00a0\\n  *  from 24.4 before 24.4R2-S1-EVO,\\u00a0\\n  *  from 25.2 before 25.2R1-S2-EVO, 25.2R2-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\": \"HIGH\", \"attackVector\": \"ADJACENT_NETWORK\", \"availabilityImpact\": \"HIGH\", \"baseScore\": 7.1, \"baseSeverity\": \"HIGH\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"scope\": \"UNCHANGED\", \"userInteraction\": \"NONE\", \"vectorString\": \"CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"version\": \"3.1\"}, \"format\": \"CVSS\", \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}, {\"cvssV4_0\": {\"Automatable\": \"NOT_DEFINED\", \"Recovery\": \"NOT_DEFINED\", \"Safety\": \"NOT_DEFINED\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"PRESENT\", \"attackVector\": \"ADJACENT\", \"baseScore\": 7.5, \"baseSeverity\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"providerUrgency\": \"GREEN\", \"subAvailabilityImpact\": \"LOW\", \"subConfidentialityImpact\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L/RE:M/U:Green\", \"version\": \"4.0\", \"vulnAvailabilityImpact\": \"HIGH\", \"vulnConfidentialityImpact\": \"HIGH\", \"vulnIntegrityImpact\": \"HIGH\", \"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\": \"2026-01-15T20:21:41.576Z\"}, \"references\": [{\"tags\": [\"vendor-advisory\"], \"url\": \"https://supportportal.juniper.net/JSA106007\"}, {\"tags\": [\"vendor-advisory\"], \"url\": \"https://kb.juniper.net/JSA106007\"}], \"solutions\": [{\"lang\": \"en\", \"supportingMedia\": [{\"base64\": false, \"type\": \"text/html\", \"value\": \"The following software releases have been updated to resolve this specific issue:\u003cbr\u003eJunos OS 23.2R2-S5, 23.4R2-S6, 24.2R2-S3, 24.4R2-S1, 25.2R1-S2, 25.2R2, 25.4R1, and all subsequent releases.\u003cbr\u003eJunos OS Evolved:\u0026nbsp;23.2R2-S5-EVO, 23.4R2-S6-EVO, 24.2R2-S3-EVO, 24.4R2-S1-EVO, 25.2R1-S2-EVO, 25.2R2-EVO, 25.4R1-EVO,\"}], \"value\": \"The following software releases have been updated to resolve this specific issue:\\nJunos OS 23.2R2-S5, 23.4R2-S6, 24.2R2-S3, 24.4R2-S1, 25.2R1-S2, 25.2R2, 25.4R1, and all subsequent releases.\\nJunos OS Evolved:\\u00a023.2R2-S5-EVO, 23.4R2-S6-EVO, 24.2R2-S3-EVO, 24.4R2-S1-EVO, 25.2R1-S2-EVO, 25.2R2-EVO, 25.4R1-EVO,\"}], \"source\": {\"advisory\": \"JSA106007\", \"defect\": [\"1896371\"], \"discovery\": \"INTERNAL\"}, \"title\": \"Junos OS and Junos OS Evolved: Use after free vulnerability In 802.1X authentication daemon can cause crash of the dot1xd process\", \"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\": {\"id\": \"CVE-2026-21908\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-01-16T04:55:55.863089Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-01-15T20:45:01.036Z\"}, \"title\": \"CISA ADP Vulnrichment\"}]}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-21908\", \"assignerOrgId\": \"8cbe9d5a-a066-4c94-8978-4b15efeae968\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"juniper\", \"dateReserved\": \"2026-01-05T17:32:48.710Z\", \"datePublished\": \"2026-01-15T20:21:41.576Z\", \"dateUpdated\": \"2026-01-16T04:55:55.090Z\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
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