Improper handling of exceptional conditions in Juniper Junos OS - CVE-2026-21906

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU121663

Improper handling of exceptional conditions in Juniper Junos OS - CVE-2026-21906

Published: January 19, 2026


Vulnerability identifier: #VU121663
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/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-2026-21906
CWE-ID: CWE-755
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Juniper Networks, Inc.
Affected software:
Juniper Junos OS

Detailed vulnerability description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper handling of exceptional conditions error in the packet forwarding engine (PFE) when PowerMode IPsec (PMI) and GRE performance acceleration are enabled. A remote non-authenticated attacker can cause the PFE to crash and restart by sending specially crafted ICMP packets.


How to mitigate CVE-2026-21906

Install updates from vendor's website.

Sources