#VU121700 Incorrect calculation in Junos OS Evolved - CVE-2026-21911

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU121700

#VU121700 Incorrect calculation in Junos OS Evolved - CVE-2026-21911

Published: January 20, 2026


Vulnerability identifier: #VU121700
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-2026-21911
CWE-ID: CWE-682
Exploitation vector: Adjecent network
Exploit availability: No public exploit available
Vulnerable software:
Junos OS Evolved
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 incorrect calculation error in the Layer 2 Control Protocol Daemon (l2cpd). A remote non-authenticated attacker can cause the learning of new MACs over label-switched interfaces (LSI) to stop while generating a flood of logs, resulting in high CPU usage.


Remediation

Install updates from vendor's website.

External links