Vulnerability in Juniper Networks Session Smart Router

[ Description ]Official description

An Out-of-bounds Write vulnerability in the SSR TCP proxy/optimization path in Juniper Networks Session Smart Router allows an attacker to corrupt forwarded packet data and potentially cause a data-plane crash via a transit TCP packet with a crafted TCP option length.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• NCSC-NL30 Oct 2026NCSC-2026-0462

  Vulnerabilities fixed in Juniper Networks Session Smart Router and Session Smart Conductor Translated from Dutch

  Probability/damage M/HCVE-2026-103390CVE-2026-103391CVE-2026-103392+15 more CVEs
• CERT-FR29 Oct 2026CERTFR-2026-AVI-1414

  Multiple vulnerabilities in Juniper Networks products Translated from French

  Multiple vulnerabilities have been discovered in Juniper Networks products. Some of them allow an attacker to cause remote arbitrary code execution, privilege escalation and remote denial of service.

  CVE-2026-103407CVE-2026-103409CVE-2026-103410+15 more CVEs
• BSI CERT-Bund28 Oct 2026WID-SEC-2026-4234

  Juniper Session Smart Router: Multiple vulnerabilities Translated from German

  CVE-2026-103408CVE-2026-103402CVE-2026-103401+15 more CVEs

[ References ]References

• supportportal.juniper.net/JSA112183