SB2026011988 - Remote denial of service in Junos OS PFE
Published: January 19, 2026
Security Bulletin ID
SB2026011988
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper handling of exceptional conditions (CVE-ID: CVE-2026-21906)
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 update from vendor's website.