SB2026031201 - Denial of service in Cisco IOS XR Egress Packet Network Interface Aligner
Published: March 12, 2026
Security Bulletin ID
SB2026031201
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 cleanup on thrown exception (CVE-ID: CVE-2026-20118)
The vulnerability allows a remote attacker to perform a denial of service attack.
The vulnerability exists due to an error when handling Egress Packet Network Interface (EPNI) Aligner interrupt. A remote attacker can send a continuous flow of crafted packets to an interface of the affected device and prevent traffic from traversing the interface.
Remediation
Install update from vendor's website.