#VU121679 Memory leak in Junos OS Evolved and Juniper Junos OS - CVE-2026-21909

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Main Vulnerability Database Vulnerabilities #VU121679

#VU121679 Memory leak in Junos OS Evolved and Juniper Junos OS - CVE-2026-21909

Published: January 20, 2026


Vulnerability identifier: #VU121679
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-21909
CWE-ID: CWE-401
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 non-authenticated attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to missing release of memory after effective lifetime error in the routing protocol daemon (rpd). A remote non-authenticated attacker can send a specific update packet causing a memory leak.


Remediation

Install updates from vendor's website.

External links