CVE-2026-103391
Medium
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.
SeverityMedium
CVSS5.3
Exploit probability—
ProductSession Smart Router
PublishedOct 28, 2026
First seenNov 6, 2026
Weakness typeCWE-787Out-of-bounds write
How to fix
Update
- Juniper Networks Session Smart Router7.0.5, 7.1.7, 7.2.3 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Juniper Networks Session Smart Router | v < 7.0.5, 7.1.0 ≤ v < 7.1.7, 7.2.0 ≤ v < 7.2.3 | 7.0.5, 7.1.7, 7.2.3 |
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