CVE-2021-1424: Cisco Asr 5000 Series Software

Medium severity, CVSS 5.3. EPSS: 0.8% chance of exploitation in the next 30 days.

A vulnerability in the ipsecmgr process of Cisco ASR 5000 Series Software (StarOS) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. This vulnerability is due to insufficient validation of incoming Internet Key Exchange Version 2 (IKEv2) packets. An attacker could exploit this vulnerability by sending specifically malformed IKEv2 packets to an affected device. A successful exploit could allow the attacker to cause the ipsecmgr process to restart, which would disrupt ongoing IKE negotiations and result in a temporary DoS condition.Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

Affected products

• Cisco Asr 5000 Series Software: version 21.15.7 only; version 21.13.10 only; version 21.14.1 only; version 21.11.5 only; version 21.13.8 only; version 21.14.5 only; …
• Cisco Cisco Asr 5000 Series Software: version 21.15.7 only; version 21.13.10 only; version 21.14.1 only; version 21.11.5 only; version 21.13.8 only; version 21.14.5 only; …

Published 2024-11-18. Last modified 2026-06-17.