CVE-2006-4194: Cisco Pix Firewall 501

Medium severity, CVSS 5.0. EPSS: 2.3% chance of exploitation in the next 30 days.

Unspecified vulnerability in Cisco PIX 500 Series Security Appliances allows remote attackers to send arbitrary UDP packets to intranet devices via unspecified vectors involving Session Initiation Protocol (SIP) fixup commands, a different issue than CVE-2006-4032. NOTE: the vendor, after working with the researcher, has been unable to reproduce the issue

Affected products

• Cisco Pix Firewall 501: any version
• Cisco Pix Firewall 506: any version
• Cisco Pix Firewall 515: any version
• Cisco Pix Firewall 515e: any version
• Cisco Pix Firewall 520: any version
• Cisco Pix Firewall 525: any version
• Cisco Pix Firewall 535: any version
• Cisco Pix Firewall Software: version 6.3 only

Published 2006-08-17. Last modified 2026-06-16.