According to its self-reported version, Cisco IOS XR Software is affected by multiple vulnerabilities:

  - A vulnerability in the implementation of the Intermediate System-to-Intermediate System (IS-IS)   routing protocol functionality in Cisco IOS XR Software could allow an unauthenticated attacker   who is in the same IS-IS area to cause a denial of service (DoS) condition. The vulnerability is   due to incorrect processing of crafted IS-IS link-state protocol data units (PDUs).
  An attacker could exploit this vulnerability by sending a crafted link-state PDU to an affected   system to be processed. A successful exploit could allow the attacker to cause all routers within   the IS-IS area to unexpectedly restart the IS-IS process, resulting in a DoS condition. This   vulnerability affects Cisco devices if they are running a vulnerable release of Cisco IOS XR   Software earlier than Release 6.6.3 and are configured with the IS-IS routing protocol. Cisco has   confirmed that this vulnerability affects both Cisco IOS XR 32-bit Software and Cisco IOS XR 64-bit   Software. (CVE-2019-1910)

  - A vulnerability in the implementation of Intermediate System-to-Intermediate System (IS-IS)   routing protocol functionality in Cisco IOS XR Software could allow an unauthenticated attacker   who is in the same IS-IS area to cause a denial of service (DoS) condition. The vulnerability is   due to incorrect processing of IS-IS link-state protocol data units (PDUs).
  An attacker could exploit this vulnerability by sending specific link-state PDUs to an affected   system to be processed. A successful exploit could allow the attacker to cause incorrect calculations   used in the weighted remote shared risk link groups (SRLG) or in the IGP Flexible Algorithm. It   could also cause tracebacks to the logs or potentially cause the receiving device to crash the IS-IS   process, resulting in a DoS condition. (CVE-2019-1918)

Please see the included Cisco BIDs and Cisco Security Advisory for more information

Detections

Analytics

Cisco IOS XR Software Intermediate System-to-Intermediate System Denial of Service Vulnerability

high Nessus Plugin ID 127900

Version 1.10