CVE-2013-5477: Cisco IOS

High severity, CVSS 7.8. EPSS: 1.9% chance of exploitation in the next 30 days.

The T1/E1 driver-queue functionality in Cisco IOS 12.2 and 15.0 through 15.3, when an HDLC32 driver is used, allows remote attackers to cause a denial of service (interface queue wedge) via bursty network traffic, aka Bug ID CSCub67465.

Affected products

• Cisco IOS: version 12.2 only; version 15.0 only; version 15.1 only; version 15.2 only; version 15.3 only

Published 2013-09-27. Last modified 2026-06-16.