CVE-2021-1313: Cisco IOS XR

High severity, CVSS 7.5. EPSS: 2% chance of exploitation in the next 30 days.

Multiple vulnerabilities in the ingress packet processing function of Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. For more information about these vulnerabilities, see the Details section of this advisory.

Affected products

• Cisco IOS XR: from 5.0.0, before 5.2.6 (fixed in 5.2.6); from 5.3.0, before 5.3.4 (fixed in 5.3.4)

Published 2021-02-04. Last modified 2026-06-17.