CVE-2026-103392

Session Smart Router: A SACK option causes out-of-bounds memory access and TCP payload corruption when TCP sequence stitching is enabled

Published Oct 28, 2026 CVSS 3.1 · 4.8 Medium EPSS < 1% KEV · Not listed
Description
An Out-of-Bounds Write vulnerability in the TCP header processing in Juniper Networks Session Smart Router allows an attacker to corrupt TCP payload data and potentially cause session desynchronization via a transit TCP packet with an oversized SACK option length.

Remediation

Vendor Solution

The following software releases of Session Smart Router have been updated to resolve these specific issues: * 7.0.5 and all subsequent releases; * 7.1.7 and all subsequent releases; * 7.2.3 and all subsequent releases.


Vendor Workaround

There are no known workarounds for this issue.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Juniper
Juniper session Smart Router
Vendors & Products Juniper
Juniper session Smart Router
Type Values Removed Values Added
Description An Out-of-Bounds Write vulnerability in the TCP header processing in Juniper Networks Session Smart Router allows an attacker to corrupt TCP payload data and potentially cause session desynchronization via a transit TCP packet with an oversized SACK option length.
Title Session Smart Router: A SACK option causes out-of-bounds memory access and TCP payload corruption when TCP sequence stitching is enabled
Weaknesses CWE-787
References
Metrics cvssV3_1

{'score': 4.8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
juniper
Published
Updated
Nov 5, 2026, 6:59 PM
Reserved
Sep 30, 2026, 2:27 PM
Status
Awaiting Analysis
Published
Oct 28, 2026, 5:17 PM
Modified
Nov 5, 2026, 7:17 PM