CVE-2013-5481: Cisco IOS

High severity, CVSS 7.1. EPSS: 2% chance of exploitation in the next 30 days.

The PPTP implementation in Cisco IOS 12.2 and 15.0 through 15.3, when NAT is used, allows remote attackers to cause a denial of service (device reload) via crafted TCP port-1723 packets, aka Bug ID CSCtq14817.

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.