Riskcovery

CVE-2026-57026

Junos OS: MX Series with SPC3, SRX Series: Processing of a specifically malformed SIP invite causes a flowd crash

State
Published
Severity
8.7 High
Published
Jul 9, 2026
Updated
Jul 10, 2026
Reserved
Jun 23, 2026

Read the record on cve.org

Description

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.

Scores

CVSSScoreVectorSource
4.08.7 HighCVSS: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:Mjuniper
3.17.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hjuniper

Weaknesses

  • CWE-1286 Improper Validation of Syntactic Correctness of Input

Affected Products

ProductVersions
Junos OSJuniper Networks
  • before 23.2R2-S7Affected
  • 23.4 to before 23.4R2-S8Affected
  • 24.2 to before 24.2R2-S5Affected
  • 24.4 to before 24.4R2-S4Affected
  • 25.2 to before 25.2R2Affected
  • 25.4 to before 25.4R1-S2Affected

References

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