QID 317065

Date Published: 2021-09-29

QID 317065: Cisco Internetwork Operating System (IOS) XR Unidirectional Link Detection Denial of Service (DoS) Vulnerability (cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ)

A vulnerability in the Unidirectional Link Detection (UDLD) feature of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause an affected device to reload.

Affected Products
Cisco devices if they were running a vulnerable release of the following Cisco software and had the UDLD feature enabled:
IOS XR 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 the affected device to reload, resulting in a denial of service (DoS) condition.
Note: On Cisco IOS XR devices, the impact is limited to the reload of the UDLD process.

  • CVSS V2 rated as High - 7.5 severity.
    • Solution

    Customers are advised to refer to cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ for more information.

    Vendor References

    CVEs related to QID 317065

    CVE-2021-34714 |
    Software Advisories
    Advisory ID Software Component Link
    cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ URL Logo tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ
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