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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.

PUBLISHED Reserved 2026-06-23 | Published 2026-07-09 | Updated 2026-07-10 | Assigner juniper




HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

HIGH: 8.7CVSS: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

Problem types

CWE-1286 Improper Validation of Syntactic Correctness of Input

Product status

Default status
unaffected

Any version before 23.2R2-S7
affected

23.4 (custom) before 23.4R2-S8
affected

24.2 (custom) before 24.2R2-S5
affected

24.4 (custom) before 24.4R2-S4
affected

25.2 (custom) before 25.2R2
affected

25.4 (custom) before 25.4R1-S2
affected

References

supportportal.juniper.net/JSA110086 vendor-advisory

cve.org (CVE-2026-57026)

nvd.nist.gov (CVE-2026-57026)

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