Cisco IOS XE Software vulnerability

What happened

A vulnerability in the Network-Based Application Recognition (NBAR) feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload, causing a denial of service (DoS) condition. This vulnerability is due to improper handling of malformed Control and Provisioning of Wireless Access Points (CAPWAP) packets. An attacker could exploit this vulnerability by sending malformed CAPWAP packets through an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly, resulting in a DoS condition.

Affected versions

Cisco IOS XE Software: 3.7.0S; 3.7.1S; 3.7.2S; 3.7.3S; 3.7.4S; 3.7.5S; 3.7.6S; 3.7.7S; 3.7.4aS; 3.7.2tS; 3.7.0bS; 3.7.1aS; 3.8.0S; 3.8.1S; 3.8.2S; 3.9.1S; 3.9.0S; 3.9.2S; 3.9.1aS; 3.9.0aS; 3.11.1S; 3.11.2S; 3.11.0S; 3.11.3S; 3.11.4S; 3.12.0S; 3.12.1S; 3.12.2S; 3.12.3S; 3.12.0aS; 3.12.4S; 3.13.0S; 3.13.1S; 3.13.2S; 3.13.3S; 3.13.4S; 3.13.5S; 3.13.2aS; 3.13.0aS; 3.13.5aS; 3.13.6S; 3.13.7S; 3.13.6aS; 3.13.7aS; 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; 3.16.1S; 3.16.1aS; 3.16.2S; 3.16.2aS; 3.16.0cS; 3.16.3S; 3.16.2bS; 3.16.3aS; 3.16.4S; 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; 3.17.1aS; 3.17.3S; 3.17.4S; 16.1.1; 16.1.2; 16.1.3; 16.2.1; 16.2.2; 16.3.1; 16.3.2; 16.3.3; 16.3.1a; 16.3.4; 16.3.5; 16.3.5b; 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; 16.5.1a; 16.5.1b; 16.5.2; 16.5.3; 3.18.0aS; 3.18.0S; 3.18.1S; 3.18.2S; 3.18.3S; 3.18.4S; 3.18.0SP; 3.18.1SP; 3.18.1aSP; 3.18.1bSP; 3.18.1cSP; 3.18.2SP; 3.18.2aSP; 3.18.3SP; 3.18.4SP; 3.18.3aSP; 3.18.3bSP; 3.18.5SP; 3.18.6SP; 3.18.7SP; 3.18.8aSP; 3.18.9SP; 16.6.1; 16.6.2; 16.6.3; 16.6.4; 16.6.5; 16.6.4a; 16.6.5a; 16.6.6; 16.6.7; 16.6.8; 16.6.9; 16.6.10; 16.7.1; 16.7.1a; 16.7.1b; 16.7.2; 16.7.3; 16.7.4; 16.8.1; 16.8.1a; 16.8.1b; 16.8.1s; 16.8.1c; 16.8.1d; 16.8.2; 16.8.1e; 16.8.3; 16.9.1; 16.9.2; 16.9.1a; 16.9.1b; 16.9.1s; 16.9.3; 16.9.4; 16.9.3a; 16.9.5; 16.9.5f; 16.9.6; 16.9.7; 16.9.8; 16.10.1; 16.10.1a; 16.10.1b; 16.10.1s; 16.10.1c; 16.10.1e; 16.10.1d; 16.10.2; 16.10.1f; 16.10.1g; 16.10.3; 16.11.1; 16.11.1a; 16.11.1b; 16.11.2; 16.11.1s; 16.12.1; 16.12.1s; 16.12.1a; 16.12.1c; 16.12.1w; 16.12.2; 16.12.1y; 16.12.2a; 16.12.3; 16.12.8; 16.12.2s; 16.12.1x; 16.12.1t; 16.12.4; 16.12.3s; 16.12.3a; 16.12.4a; 16.12.5; 16.12.6; 16.12.1z1; 16.12.5a; 16.12.5b; 16.12.1z2; 16.12.6a; 16.12.7; 16.12.9; 16.12.10; 16.12.10a; 16.12.11; 16.12.12; 16.12.13; 17.1.1; 17.1.1a; 17.1.1s; 17.1.1t; 17.1.3; 17.2.1; 17.2.1r; 17.2.1a; 17.2.1v; 17.2.2; 17.2.3; 17.3.1; 17.3.2; 17.3.3; 17.3.1a; 17.3.1w; 17.3.2a; 17.3.1x; 17.3.1z; 17.3.4; 17.3.5; 17.3.4a; 17.3.6; 17.3.4b; 17.3.4c; 17.3.5a; 17.3.5b; 17.3.7; 17.3.8; 17.3.8a; 17.4.1; 17.4.2; 17.4.1a; 17.4.1b; 17.4.2a; 17.5.1; 17.5.1a; 17.6.1; 17.6.2; 17.6.1w; 17.6.1a; 17.6.1x; 17.6.3; 17.6.1y; 17.6.1z; 17.6.3a; 17.6.4; 17.6.1z1; 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; 17.7.1b; 17.7.2; 17.10.1; 17.10.1a; 17.10.1b; 17.8.1; 17.8.1a; 17.9.1; 17.9.1w; 17.9.2; 17.9.1a; 17.9.1x; 17.9.1y; 17.9.3; 17.9.2a; 17.9.1x1; 17.9.3a; 17.9.4; 17.9.1y1; 17.9.5; 17.9.4a; 17.9.5a; 17.9.5b; 17.9.6; 17.9.6a; 17.9.5e; 17.9.5f; 17.11.1; 17.11.1a; 17.12.1; 17.12.1w; 17.12.1a; 17.12.1x; 17.12.2; 17.12.3; 17.12.2a; 17.12.1y; 17.12.1z; 17.12.4; 17.12.3a; 17.12.1z1; 17.12.1z2; 17.12.4a; 17.12.4b; 17.12.1z3; 17.13.1; 17.13.1a; 17.14.1; 17.14.1a; 17.11.99SW; 17.15.1; 17.15.1w; 17.15.1a; 17.15.2; 17.15.1b; 17.15.1x; 17.15.1z; 17.15.2c; 17.15.2a; 17.15.2b; 17.16.1; 17.16.1a 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.