Junglewise Threat Intelligence

CVE-2020-3118: Cisco IOS XR Software Discovery Protocol Format String Vulnerability

CVE-2020-3118 · Severity: critical · CVSS 8.8 · Exploited in the wild · Published 2021-11-03

Technologies: Cisco IOS XR, Cisco IOS XR Software. Vendors: Cisco.

Executive brief

A format string vulnerability in the Cisco Discovery Protocol (CDP) implementation of Cisco IOS XR Software allows an unauthenticated, adjacent attacker to execute arbitrary code with administrative privileges or cause a device reload. The flaw exists due to improper validation of string input in certain CDP message fields, which can lead to a stack overflow.

Affected products

  • Cisco IOS XR Software 5.2.5, 6.4.2, 6.5.2, 6.5.3

Timeline

  • 2020-02-05: advisory: Initial vendor advisory published by Cisco
  • 2021-11-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
  • 2021-11-03: disclosed

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