CVE-2008-2739: Cisco IOS

High severity, CVSS 7.8. EPSS: 2.7% chance of exploitation in the next 30 days.

The SERVICE.DNS signature engine in the Intrusion Prevention System (IPS) in Cisco IOS 12.3 and 12.4 allows remote attackers to cause a denial of service (device crash or hang) via network traffic that triggers unspecified IPS signatures, a different vulnerability than CVE-2008-1447.

Affected products

• Cisco IOS: version 12.3t only; version 12.3xl only; version 12.3xq only; version 12.3xr only; version 12.3xs only; version 12.3xx only; …

Published 2008-09-26. Last modified 2026-06-16.