Cisco IOS XE Software vulnerability

What happened

A vulnerability in the Internet Key Exchange version 1 (IKEv1) implementation of Cisco IOS XE Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition. The attacker must have valid IKEv1 VPN credentials to exploit this vulnerability. This vulnerability is due to improper validation of IKEv1 phase 2 parameters before the IPsec security association creation request is handed off to the hardware cryptographic accelerator of an affected device. An attacker could exploit this vulnerability by sending crafted IKEv1 messages to the affected device. A successful exploit could allow the attacker to cause the device to reload.

Affected versions

Cisco IOS XE Software: 3.13.0S; 3.13.1S; 3.13.2S; 3.13.3S; 3.13.4S; 3.13.5S; 3.13.6S; 3.13.7S; 3.13.6aS; 3.13.8S; 3.13.9S; 3.13.10S; 3.14.0S; 3.14.1S; 3.14.2S; 3.14.3S; 3.14.4S; 3.15.0S; 3.15.1S; 3.15.2S; 3.15.1cS; 3.15.3S; 3.15.4S; 3.16.0S; 3.16.1aS; 3.16.2S; 3.16.0cS; 3.16.3S; 3.16.4aS; 3.16.4bS; 3.16.5S; 3.16.4dS; 3.16.6S; 3.16.7S; 3.16.6bS; 3.16.7aS; 3.16.7bS; 3.16.8S; 3.16.9S; 3.16.10S; 3.17.0S; 3.17.1S; 3.17.2S; 3.17.3S; 3.17.4S; 16.2.1; 16.2.2; 16.3.1; 16.3.2; 16.3.3; 16.3.1a; 16.3.4; 16.3.5; 16.3.6; 16.3.7; 16.3.8; 16.3.9; 16.3.10; 16.3.11; 16.4.1; 16.4.2; 16.4.3; 16.5.1; 16.5.1b; 16.5.2; 16.5.3; 3.18.2aSP; 16.6.1; 16.6.2; 16.6.3; 16.6.4; 16.6.5; 16.6.6; 16.6.7; 16.6.8; 16.6.9; 16.6.10; 16.7.1; 16.7.2; 16.7.3; 16.8.1; 16.8.1s; 16.8.2; 16.8.3; 16.9.1; 16.9.2; 16.9.1s; 16.9.3; 16.9.4; 16.9.5; 16.9.6; 16.9.7; 16.9.8; 16.10.1; 16.10.1a; 16.10.1b; 16.10.1s; 16.10.1e; 16.10.2; 16.10.3; 16.11.1; 16.11.1a; 16.11.2; 16.11.1s; 16.12.1; 16.12.1s; 16.12.1a; 16.12.1c; 16.12.2; 16.12.3; 16.12.8; 16.12.2s; 16.12.4; 16.12.3s; 16.12.5; 16.12.6; 16.12.7; 17.1.1; 17.1.1s; 17.1.1t; 17.1.3; 17.2.1; 17.2.1r; 17.2.1v; 17.2.2; 17.2.3; 17.3.1; 17.3.2; 17.3.3; 17.3.1a; 17.3.4; 17.3.5; 17.3.4a; 17.3.6; 17.3.7; 17.3.8; 17.3.8a; 17.4.1; 17.4.2; 17.4.1a; 17.4.1b; 17.5.1; 17.5.1a; 17.6.1; 17.6.2; 17.6.1a; 17.6.3; 17.6.1y; 17.6.3a; 17.6.4; 17.6.5; 17.6.6; 17.6.6a; 17.6.5a; 17.6.7; 17.6.8; 17.6.8a; 17.7.1; 17.7.1a; 17.7.2; 17.10.1; 17.10.1a; 17.8.1; 17.8.1a; 17.9.1; 17.9.2; 17.9.1a; 17.9.3; 17.9.2a; 17.9.3a; 17.9.4; 17.9.5; 17.9.4a; 17.9.5a; 17.9.5b; 17.9.5e; 17.9.5f; 17.11.1; 17.11.1a; 17.12.1; 17.12.1a; 17.12.2; 17.12.3; 17.12.2a; 17.12.3a; 17.13.1; 17.13.1a; 17.14.1; 17.14.1a Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

• Apply vendor-provided updates or mitigations.
• Review affected product exposure and access logs.