#VU121663 Improper handling of exceptional conditions in Juniper Junos OS - CVE-2026-21906

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Main Vulnerability Database Vulnerabilities #VU121663

#VU121663 Improper handling of exceptional conditions in Juniper Junos OS - CVE-2026-21906

Published: January 19, 2026


Vulnerability identifier: #VU121663
Vulnerability risk: Medium
CVSSv4.0: 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
Vulnerable software:
Juniper Junos OS
Software vendor:
Juniper Networks, Inc.

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.


Remediation

Install updates from vendor's website.

External links