SB2026012063 - Improper Check for Unusual or Exceptional Conditions in Juniper Junos OS
Published: January 20, 2026
Security Bulletin ID
SB2026012063
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Adjecent network
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper Check for Unusual or Exceptional Conditions (CVE-ID: CVE-2026-21910)
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to improper check for unusual or exceptional conditions error in the packet forwarding engine (PFE). A remote non-authenticated attacker can cause traffic between VXLAN Network Identifiers (VNIs) to drop, leading to a Denial of Service (DoS).
Remediation
Install update from vendor's website.