Improper cleanup on thrown exception in Cisco IOS XR - CVE-2026-20118
Published: March 12, 2026
Vulnerability identifier: #VU123906
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:H]
CVE-ID: CVE-2026-20118
CWE-ID: CWE-460
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Cisco IOS XR
How to mitigate CVE-2026-20118
Install updates from vendor's website.
Cisco IOS XR - addressed in versions 7.9.2 CSCws66900, 7.10.2 CSCws66892, 7.11.2 CSCws66900, 7.11.21 CSCws66900, 24.1.2 CSCws66892, 24.2.2 CSCws66892, 24.2.21 CSCws36724, 24.2.21 CSCws66900, 24.3.2 CSCws66900, 24.4.2 CSCws66900