CVE-2026-57026 (GCVE-0-2026-57026)

Vulnerability from cvelistv5 – Published: 2026-07-09 21:07 – Updated: 2026-07-10 14:33
VLAI
Title
Junos OS: MX Series with SPC3, SRX Series: Processing of a specifically malformed SIP invite causes a flowd crash
Summary
An Improper Validation of Syntactic Correctness of Input vulnerability in the SIP plugin of Juniper Networks Junos OS on MX Series with SPC3 and SRX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).If the SIP ALG is enabled on an affected device, the processing of a malformed SIP invite packet will cause a flow processing daemon (flowd) crash and restart. This leads to a complete service outage until the system has automatically recovered. This issue affects Junos OS on MX Series with SPC3 and SRX Series: * all versions before 23.2R2-S7, * 23.4 versions before 23.4R2-S8, * 24.2 versions before 24.2R2-S5, * 24.4 versions before 24.4R2-S4, * 25.2 versions before 25.2R2, * 25.4 versions before 25.4R1-S2.
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/RE:M
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-1286 - Improper Validation of Syntactic Correctness of Input
Assigner
References
Impacted products
Vendor Product Version
Juniper Networks Junos OS Affected: 0 , < 23.2R2-S7 (custom)
Affected: 23.4 , < 23.4R2-S8 (custom)
Affected: 24.2 , < 24.2R2-S5 (custom)
Affected: 24.4 , < 24.4R2-S4 (custom)
Affected: 25.2 , < 25.2R2 (custom)
Affected: 25.4 , < 25.4R1-S2 (custom)
Create a notification for this product.
Date Public
2026-07-08 16:00
Show details on NVD website
To clipboard 

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[{\"lang\": \"en\", \"value\": \"An Improper Validation of Syntactic Correctness of Input vulnerability in the SIP plugin of Juniper Networks Junos OS on MX Series with SPC3 and SRX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).If the SIP ALG is enabled on an affected device, the processing of a malformed SIP invite packet will cause a flow processing daemon (flowd) crash and restart. This leads to a complete service outage until the system has automatically recovered.\\n\\n\\n\\nThis issue affects Junos OS on MX Series with SPC3 and SRX Series:\\n\\n\\n  *  all versions before 23.2R2-S7,\\n  *  23.4 versions before 23.4R2-S8,\\n  *  24.2 versions before 24.2R2-S5,\\n  *  24.4 versions before 24.4R2-S4,\\n  *  25.2 versions before 25.2R2,\\n  *  25.4 versions before 25.4R1-S2.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"An Improper Validation of Syntactic Correctness of Input vulnerability in the SIP plugin of Juniper Networks Junos OS on MX Series with SPC3 and SRX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).\u003cp\u003eIf the SIP ALG is enabled on an affected device, the processing of a malformed SIP invite packet will cause a flow processing daemon (flowd) crash and restart. This leads to a complete service outage until the system has automatically recovered.\u003cbr\u003e\u003c/p\u003e\u003cp\u003e\u003cbr\u003eThis issue affects Junos OS on MX Series with SPC3 and SRX Series:\u003cbr\u003e\u003c/p\u003e\u003cul\u003e\u003cli\u003eall versions before 23.2R2-S7,\u003c/li\u003e\u003cli\u003e23.4 versions before 23.4R2-S8,\u003c/li\u003e\u003cli\u003e24.2 versions before 24.2R2-S5,\u003c/li\u003e\u003cli\u003e24.4 versions before 24.4R2-S4,\u003c/li\u003e\u003cli\u003e25.2 versions before 25.2R2,\u003c/li\u003e\u003cli\u003e25.4 versions before 25.4R1-S2.\u003c/li\u003e\u003c/ul\u003e\u003cbr\u003e\u003cp\u003e\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-1286\", \"description\": \"CWE-1286 Improper Validation of Syntactic Correctness of Input\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"To be affected the SIP ALG needs to be enabled, either implicitly / by default or by way of configuration. Please verify with:\\n\\nuser@host\u003e show security alg status | match sip\\nSIP : Enabled\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"To be affected the SIP ALG needs to be enabled, either implicitly / by default or by way of configuration. Please verify with:\u003cbr\u003e\u003cbr\u003e\u003ctt\u003euser@host\u0026gt; show security alg status | match sip\u003cbr\u003eSIP : Enabled\u003c/tt\u003e\", \"base64\": false}]}], \"providerMetadata\": {\"orgId\": \"8cbe9d5a-a066-4c94-8978-4b15efeae968\", \"shortName\": \"juniper\", \"dateUpdated\": \"2026-07-09T21:07:44.855Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-57026\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-10T14:33:07.076Z\", \"dateReserved\": \"2026-06-23T16:27:00.248Z\", \"assignerOrgId\": \"8cbe9d5a-a066-4c94-8978-4b15efeae968\", \"datePublished\": \"2026-07-09T21:07:44.855Z\", \"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.