CVE-2009-0630: Cisco IOS

High severity, CVSS 7.1. EPSS: 1.8% chance of exploitation in the next 30 days.

The (1) Cisco Unified Communications Manager Express; (2) SIP Gateway Signaling Support Over Transport Layer Security (TLS) Transport; (3) Secure Signaling and Media Encryption; (4) Blocks Extensible Exchange Protocol (BEEP); (5) Network Admission Control HTTP Authentication Proxy; (6) Per-user URL Redirect for EAPoUDP, Dot1x, and MAC Authentication Bypass; (7) Distributed Director with HTTP Redirects; and (8) TCP DNS features in Cisco IOS 12.0 through 12.4 do not properly handle IP sockets, which allows remote attackers to cause a denial of service (outage or resource consumption) via a series of crafted TCP packets.

Affected products

• Cisco IOS: version 12.0 only; version 12.0da only; version 12.0db only; version 12.0dc only; version 12.0s only; version 12.0sc only; …

Published 2009-03-27. Last modified 2026-06-16.