CVE-2013-5503: Cisco IOS XR

High severity, CVSS 7.8. EPSS: 1.3% chance of exploitation in the next 30 days.

The UDP process in Cisco IOS XR 4.3.1 does not free packet memory upon detecting full packet queues, which allows remote attackers to cause a denial of service (memory consumption) via UDP packets to listening ports, aka Bug ID CSCue69413.

Affected products

• Cisco IOS XR: version 4.3.1 only

Published 2013-10-02. Last modified 2026-06-16.