CVE-2026-103391

Session Smart Router: An attacker-controlled TCP option causes an out-of-bounds write when using the TCP proxy feature

State: Published
Severity: 5.3 Medium
Published: Oct 28, 2026
Updated: Oct 28, 2026
Reserved: Sep 30, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N	juniper

Weaknesses

CWE-787 Out-of-bounds Write

Affected Products

Product	Versions
Session Smart RouterJuniper Networks	before 7.0.5Affected 7.1.0 to before 7.1.7Affected 7.2.0 to before 7.2.3Affected

References

https://supportportal.juniper.net/JSA112183vendor-advisory

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.