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Cisco PIX 500 and ASA 5500 Series Security Appliances 6.x before 6.3(5.115), 7.0 before 7.0(5.2), and 7.1 before 7.1(2.5), and the FWSM 3.x before 3.1(3.24), when the "inspect sip" option is enabled, allows remote attackers to cause a denial of service (device reboot) via malformed SIP packets.
Use Cisco vendor hub and Asa 5500 product page to widen CVE-2007-0961 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2016-6366, CVE-2016-6367 and CVE-2011-3304 for nearby disclosures in the same product family. Additional editorial context is available in The Weekly Cybersecurity Brief: January 30th, 2026.