CVE-2026-103391: Session Smart Router: An attacker-controlled TCP option causes an out-of-bounds write when using the TCP proxy feature
Published Oct 28, 2026
·Updated
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.
Affected Software
1 affected component
Juniper Networks Session Smart Router
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Juniper Networks Session Smart Routerto a version that resolves this vulnerability.Fixed in 7.0.5 - Upgrade
Upgrade
Juniper Networks Session Smart Routerto a version that resolves this vulnerability.Fixed in 7.1.7 - Upgrade
Upgrade
Juniper Networks Session Smart Routerto a version that resolves this vulnerability.Fixed in 7.2.3
Event History
Oct 28, 2026
CVE Published
via MITRE·04:33 PM
Data Sourced
via MITRE·04:33 PM
RemedyDescriptionSeverityWeakness