#VU121702 Use-after-free in Junos OS Evolved and Juniper Junos OS - CVE-2026-21908

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Main Vulnerability Database Vulnerabilities #VU121702

#VU121702 Use-after-free in Junos OS Evolved and Juniper Junos OS - CVE-2026-21908

Published: January 20, 2026


Vulnerability identifier: #VU121702
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-21908
CWE-ID: CWE-416
Exploitation vector: Adjecent network
Exploit availability: No public exploit available
Vulnerable software:
Junos OS Evolved
Juniper Junos OS
Software vendor:
Juniper Networks, Inc.

Description

The vulnerability allows a remote user to execute arbitrary code.

The vulnerability exists due to a use-after-free error in the 802.1X authentication daemon (dot1xd). A remote authenticated user can execute arbitrary code with elevated privileges. 

This issue affects systems with 802.1X authentication port-based network access control (PNAC) enabled.


Remediation

Install updates from vendor's website.

External links