QID 317113

Date Published: 2021-11-10

QID 317113: Cisco Internetwork Operating System (IOS) XR Software Intermediate System-to-Intermediate System (IS-IS) Denial of Service (DoS) Vulnerability (cisco-sa-20200122-ios-xr-dos)

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 authenticated, remote attacker to cause a denial of service (DoS) condition in the IS-IS process.

Affected Products
Cisco devices if they are running Cisco IOS XR Software releases earlier than 6.6.3, 7.0.2, 7.1.1, or 7.2.1 and
they configured with both the IS-IS routing protocol and SNMP versions 1, 2c, or 3.
Note: Cisco has confirmed that this vulnerability affects both Cisco IOS XR 32-bit Software and Cisco IOS XR 64-bit Software.

QID Detection Logic (Authenticated):
The check matches Cisco IOS XR version retrieved via Unix Auth using "show version" command.

A successful exploit could allow the attacker to cause a DoS condition in the IS-IS process.

  • CVSS V3 rated as High - 6.5 severity.
  • CVSS V2 rated as Medium - 4 severity.
    • Solution

    Customers are advised to refer to cisco-sa-20200122-ios-xr-dos for more information.

    Vendor References

    CVEs related to QID 317113

    CVE-2019-16027 |
    Software Advisories
    Advisory ID Software Component Link
    cisco-sa-20200122-ios-xr-dos URL Logo tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-ios-xr-dos
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