🛡️ CVE-2026-21903
🟡 CVSS 6.5 — Medium ✅ No Known Exploit CWE-121 NVD
6.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

A Stack-based Buffer Overflow vulnerability in the Packet Forwarding Engine (pfe) of Juniper Networks Junos OS allows a network-based attacker, authenticated with low privileges to cause a Denial-of-Service (DoS). Subscribing to telemetry sensors at scale causes all FPC connections to drop, resulting in an FPC crash and restart. The issue was not seen when YANG packages for the specific sensors were installed. This issue affects Junos OS:  * all versions before 22.4R3-S7, * 23.2 version before 23.2R2-S4, * 23.4 versions before 23.4R2.

Details

Severity MEDIUM
CVSS Score 6.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE CWE-121
Public Exploit ✅ No
Source NVD
Published 2026-01-15
Updated 2026-06-02
Modified 2026-01-23
Fix URL N/A

Affected Packages

Software From version Fixed in
junos — —

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