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CVE-2026-21905 (GCVE-0-2026-21905)

Vulnerability from cvelistv5 – Published: 2026-01-15 20:19 – Updated: 2026-01-16 16:26
VLAI
Title
Junos OS: SRX Series, MX Series with MX-SPC3 or MS-MPC: Receipt of multiple specific SIP messages results in flow management process crash
Summary
A Loop with Unreachable Exit Condition ('Infinite Loop') vulnerability in the SIP application layer gateway (ALG) of Juniper Networks Junos OS on SRX Series and MX Series with MX-SPC3 or MS-MPC allows an unauthenticated network-based attacker sending specific SIP messages over TCP to crash the flow management process, leading to a Denial of Service (DoS). On SRX Series, and MX Series with MX-SPC3 or MS-MPC service cards, receipt of multiple SIP messages causes the SIP headers to be parsed incorrectly, eventually causing a continuous loop and leading to a watchdog timer expiration, crashing the flowd process on SRX Series and MX Series with MX-SPC3, or mspmand process on MX Series with MS-MPC. This issue only occurs over TCP. SIP messages sent over UDP cannot trigger this issue. This issue affects Junos OS on SRX Series and MX Series with MX-SPC3 and MS-MPC: * all versions before 21.2R3-S10,  * from 21.4 before 21.4R3-S12,  * from 22.4 before 22.4R3-S8,  * from 23.2 before 23.2R2-S5,  * from 23.4 before 23.4R2-S6,  * from 24.2 before 24.2R2-S3,  * from 24.4 before 24.4R2-S1,  * from 25.2 before 25.2R1-S1, 25.2R2.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7 (High)
CVSS:4.0/AV:N/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
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-16 16:25 UTC
CWE
  • CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Assigner
References
Impacted products
Vendor Product Version CPE status
Juniper Networks Junos OS Affected: 0 , < 21.2R3-S10 (semver)
Affected: 21.4 , < 21.4R3-S12 (semver)
Affected: 22.4 , < 22.4R3-S8 (semver)
Affected: 23.2 , < 23.2R2-S5 (semver)
Affected: 23.4 , < 23.4R2-S6 (semver)
Affected: 24.2 , < 24.2R2-S3 (semver)
Affected: 24.4 , < 24.4R2-S1 (semver)
Affected: 25.2 , < 25.2R1-S1, 25.2R2 (semver)
guessed Create a notification for this product.
Date Public
2026-01-14 17:00
Show details on NVD website
To clipboard 

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              "value": "A Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027) vulnerability in the SIP application layer gateway (ALG) of Juniper Networks Junos OS on SRX Series and MX Series with MX-SPC3 or MS-MPC allows an unauthenticated network-based attacker sending specific SIP messages over TCP to crash the flow management process, leading to a Denial of Service (DoS).\u003cbr\u003e\u003cbr\u003eOn SRX Series, and MX Series with MX-SPC3 or MS-MPC service cards, receipt of multiple SIP messages causes the SIP headers to be parsed incorrectly, eventually causing a continuous loop and leading to a watchdog timer expiration, crashing the flowd process on SRX Series and MX Series with MX-SPC3, or mspmand process on MX Series with MS-MPC.\u003cbr\u003e\u003cbr\u003eThis issue only occurs over TCP. SIP messages sent over UDP cannot trigger this issue.\u003cbr\u003e\u003cbr\u003e\u003cp\u003eThis issue affects Junos OS on SRX Series and MX Series with MX-SPC3 and MS-MPC:\u003c/p\u003e\u003cp\u003e\u003c/p\u003e\u003cul\u003e\u003cli\u003eall versions before 21.2R3-S10,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 21.4 before 21.4R3-S12,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 22.4 before 22.4R3-S8,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 23.2 before 23.2R2-S5,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 23.4 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-S1, 25.2R2.\u003c/li\u003e\u003c/ul\u003e\u003cp\u003e\u003c/p\u003e"
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      "title": "Junos OS: SRX Series, MX Series with MX-SPC3 or MS-MPC: Receipt of multiple specific SIP messages results in flow management process crash",
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SIP messages sent over UDP cannot trigger this issue.\\n\\nThis issue affects Junos OS on SRX Series and MX Series with MX-SPC3 and MS-MPC:\\n\\n\\n\\n  *  all versions before 21.2R3-S10,\u00a0\\n  *  from 21.4 before 21.4R3-S12,\u00a0\\n  *  from 22.4 before 22.4R3-S8,\u00a0\\n  *  from 23.2 before 23.2R2-S5,\u00a0\\n  *  from 23.4 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-S1, 25.2R2.\"},{\"lang\":\"es\",\"value\":\"Una vulnerabilidad de Bucle con Condici\u00f3n de Salida Inalcanzable (\u0027Bucle Infinito\u0027) en el gateway de capa de aplicaci\u00f3n SIP (ALG) de Juniper Networks Junos OS en las series SRX y MX con MX-SPC3 o MS-MPC permite a un atacante no autenticado basado en red que env\u00eda mensajes SIP espec\u00edficos a trav\u00e9s de TCP bloquear el proceso de gesti\u00f3n de flujo, lo que lleva a una Denegaci\u00f3n de Servicio (DoS).\\n\\nEn las series SRX y MX con tarjetas de servicio MX-SPC3 o MS-MPC, la recepci\u00f3n de m\u00faltiples mensajes SIP provoca que los encabezados SIP se analicen incorrectamente, lo que finalmente causa un bucle continuo y lleva a la expiraci\u00f3n de un temporizador watchdog, bloqueando el proceso flowd en las series SRX y MX con MX-SPC3, o el proceso mspmand en las series MX con MS-MPC.\\n\\nEste problema solo ocurre a trav\u00e9s de TCP. Los mensajes SIP enviados a trav\u00e9s de UDP no pueden desencadenar este problema.\\n\\nEste problema afecta a Junos OS en las series SRX y MX con MX-SPC3 y MS-MPC:\\n\\n  *  todas las versiones anteriores a 21.2R3-S10,\\n  *  desde 21.4 anteriores a 21.4R3-S12,\\n  *  desde 22.4 anteriores a 22.4R3-S8,\\n  *  desde 23.2 anteriores a 23.2R2-S5,\\n  *  desde 23.4 anteriores a 23.4R2-S6,\\n  *  desde 24.2 anteriores a 24.2R2-S3,\\n  *  desde 24.4 anteriores a 24.4R2-S1,\\n  *  desde 25.2 anteriores a 25.2R1-S1, 25.2R2.\"}],\"affected\":[{\"source\":\"sirt@juniper.net\",\"affectedData\":[{\"vendor\":\"Juniper Networks\",\"product\":\"Junos OS\",\"defaultStatus\":\"unaffected\",\"platforms\":[\"SRX Series\",\"MX Series with MX-SPC3\",\"MX Series with 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    "redhat_vex": {
      "current_release_date": "2026-01-16T21:33:34+00:00",
      "cve": "CVE-2026-21905",
      "id": "CVE-2026-21905",
      "initial_release_date": "2026-01-14T17:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "Junos OS: SRX Series, MX Series with MX-SPC3 or MS-MPC: Receipt of multiple specific SIP messages results in flow management process crash",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21905.json",
      "version": "3"
    },
    "vulnrichment": {
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\"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"NONE\", \"vulnerabilityResponseEffort\": \"MODERATE\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"Juniper Networks\", \"product\": \"Junos OS\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"21.2R3-S10\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"21.4\", \"lessThan\": \"21.4R3-S12\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"22.4\", \"lessThan\": \"22.4R3-S8\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"23.2\", \"lessThan\": \"23.2R2-S5\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"23.4\", \"lessThan\": \"23.4R2-S6\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"24.2\", \"lessThan\": \"24.2R2-S3\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"24.4\", \"lessThan\": \"24.4R2-S1\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"25.2\", \"lessThan\": \"25.2R1-S1, 25.2R2\", \"versionType\": \"semver\"}], \"platforms\": [\"SRX Series\", \"MX Series with MX-SPC3\", \"MX Series with MS-MPC\"], \"defaultStatus\": \"unaffected\"}], \"exploits\": [{\"lang\": \"en\", \"value\": \"Juniper SIRT is not aware of any malicious exploitation of this vulnerability.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Juniper SIRT is not aware of any malicious exploitation of this vulnerability.\", \"base64\": false}]}], \"solutions\": [{\"lang\": \"en\", \"value\": \"The following software releases have been updated to resolve this specific issue: 21.2R3-S10, 21.4R3-S12, 22.4R3-S8, 23.2R2-S5, 23.4R2-S6, 24.2R2-S3, 24.4R2-S1, 25.2R1-S1, 25.2R2, 25.4R1, and all subsequent releases.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"The following software releases have been updated to resolve this specific issue: 21.2R3-S10, 21.4R3-S12, 22.4R3-S8, 23.2R2-S5, 23.4R2-S6, 24.2R2-S3, 24.4R2-S1, 25.2R1-S1, 25.2R2, 25.4R1, and all subsequent releases.\", \"base64\": false}]}], \"datePublic\": \"2026-01-14T17:00:00.000Z\", \"references\": [{\"url\": \"https://supportportal.juniper.net/JSA106004\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://kb.juniper.net/JSA106004\", \"tags\": [\"vendor-advisory\"]}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"Where practical, use a firewall filter to limit SIP traffic over TCP.\\n\\nAlternately, if the SIP ALG is not required, it can be explicitly disabled on SRX Series and MX Series with MX-SPC3 via:\\n\\n# set security alg sip disable\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Where practical, use a firewall filter to limit SIP traffic over TCP.\u003cbr\u003e\u003cbr\u003eAlternately, if the SIP ALG is not required, it can be explicitly disabled on SRX Series and MX Series with MX-SPC3 via:\u003cbr\u003e\u003cbr\u003e\u003ctt\u003e# set security alg sip disable\u003c/tt\u003e\u003cbr\u003e\u003cbr\u003e\", \"base64\": false}]}], \"x_generator\": {\"engine\": \"Vulnogram 0.1.0-dev\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"A Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027) vulnerability in the SIP application layer gateway (ALG) of Juniper Networks Junos OS on SRX Series and MX Series with MX-SPC3 or MS-MPC allows an unauthenticated network-based attacker sending specific SIP messages over TCP to crash the flow management process, leading to a Denial of Service (DoS).\\n\\nOn SRX Series, and MX Series with MX-SPC3 or MS-MPC service cards, receipt of multiple SIP messages causes the SIP headers to be parsed incorrectly, eventually causing a continuous loop and leading to a watchdog timer expiration, crashing the flowd process on SRX Series and MX Series with MX-SPC3, or mspmand process on MX Series with MS-MPC.\\n\\nThis issue only occurs over TCP. SIP messages sent over UDP cannot trigger this issue.\\n\\nThis issue affects Junos OS on SRX Series and MX Series with MX-SPC3 and MS-MPC:\\n\\n\\n\\n  *  all versions before 21.2R3-S10,\\u00a0\\n  *  from 21.4 before 21.4R3-S12,\\u00a0\\n  *  from 22.4 before 22.4R3-S8,\\u00a0\\n  *  from 23.2 before 23.2R2-S5,\\u00a0\\n  *  from 23.4 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-S1, 25.2R2.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"A Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027) vulnerability in the SIP application layer gateway (ALG) of Juniper Networks Junos OS on SRX Series and MX Series with MX-SPC3 or MS-MPC allows an unauthenticated network-based attacker sending specific SIP messages over TCP to crash the flow management process, leading to a Denial of Service (DoS).\u003cbr\u003e\u003cbr\u003eOn SRX Series, and MX Series with MX-SPC3 or MS-MPC service cards, receipt of multiple SIP messages causes the SIP headers to be parsed incorrectly, eventually causing a continuous loop and leading to a watchdog timer expiration, crashing the flowd process on SRX Series and MX Series with MX-SPC3, or mspmand process on MX Series with MS-MPC.\u003cbr\u003e\u003cbr\u003eThis issue only occurs over TCP. SIP messages sent over UDP cannot trigger this issue.\u003cbr\u003e\u003cbr\u003e\u003cp\u003eThis issue affects Junos OS on SRX Series and MX Series with MX-SPC3 and MS-MPC:\u003c/p\u003e\u003cp\u003e\u003c/p\u003e\u003cul\u003e\u003cli\u003eall versions before 21.2R3-S10,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 21.4 before 21.4R3-S12,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 22.4 before 22.4R3-S8,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 23.2 before 23.2R2-S5,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 23.4 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-S1, 25.2R2.\u003c/li\u003e\u003c/ul\u003e\u003cp\u003e\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-835\", \"description\": \"CWE-835 Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"The SIP ALG must be enabled to be vulnerable to this issue. The SIP ALG is enabled by default on MX-SPC3 and some SRX Series platforms. For other platforms, the following configuration is required:\\n\\n\\n\\n[security alg sip enable]\\n\\n\\nOn SRX Series and MX Series with MX-SPC3, the SIP ALG status can be confirmed via the \u0027show security alg status\u0027 command:\\n\\n\\n\\nuser@junos\u003e show security alg status\\n\\nALG Status:\\n\\n...\\n\\n\\u00a0 SIP  \\u00a0 \\u00a0 : Enabled\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"The SIP ALG must be enabled to be vulnerable to this issue. The SIP ALG is enabled by default on MX-SPC3 and some SRX Series platforms. For other platforms, the following configuration is required:\u003cbr\u003e\u003cbr\u003e\\n\\n\u003ctt\u003e\u003cspan style=\\\"background-color: rgb(255, 255, 255);\\\"\u003e[security alg sip enable]\u003c/span\u003e\u003c/tt\u003e\u003cbr\u003e\\n\u003cbr\u003eOn SRX Series and MX Series with MX-SPC3, the SIP ALG status can be confirmed via the \u0027show security alg status\u0027 command:\u003cbr\u003e\\n\u003cbr\u003e\\n\u003ctt\u003euser@junos\u0026gt; show security alg status\u003c/tt\u003e\u003cbr\u003e\\n\u003ctt\u003eALG Status:\u003c/tt\u003e\u003cbr\u003e\\n...\u003cbr\u003e\\n\u003ctt\u003e\u0026nbsp; SIP  \u0026nbsp; \u0026nbsp; : Enabled\u003c/tt\u003e\u003cbr\u003e\", \"base64\": false}]}], \"providerMetadata\": {\"orgId\": \"8cbe9d5a-a066-4c94-8978-4b15efeae968\", \"shortName\": \"juniper\", \"dateUpdated\": \"2026-01-15T20:19:22.158Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-21905\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-16T16:26:02.071Z\", \"dateReserved\": \"2026-01-05T17:32:48.710Z\", \"assignerOrgId\": \"8cbe9d5a-a066-4c94-8978-4b15efeae968\", \"datePublished\": \"2026-01-15T20:19:22.158Z\", \"assignerShortName\": \"juniper\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.