CVE-2010-3035: Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service Vulnerability

High severity, CVSS 7.5. Actively exploited: in CISA KEV since 2022-03-25. EPSS: 5.7% chance of exploitation in the next 30 days.

Cisco IOS XR 3.4.0 through 3.9.1, when BGP is enabled, does not properly handle unrecognized transitive attributes, which allows remote attackers to cause a denial of service (peering reset) via a crafted prefix announcement, as demonstrated in the wild in August 2010 with attribute type code 99, aka Bug ID CSCti62211.

Affected products

• Cisco IOS XR: from 3.4.0, up to and including 3.9.1

Published 2010-08-30. Last modified 2026-06-16.