{"id":"CVE-2011-3279","url":"https://www.cyber-defence.io/tools/cve/CVE-2011-3279","generatedAt":"2026-10-27T19:49:00.542Z","title":"The provider-edge MPLS NAT implementation in Cisco IOS 12.1 through 12.4 and 15.0 through 15.1, and IOS XE 3.1.xSG, allows remote attackers to cause a denial of service (device reload) via a malformed SIP packet to UDP port 5060, aka Bug ID CSCti98219.","description":"The provider-edge MPLS NAT implementation in Cisco IOS 12.1 through 12.4 and 15.0 through 15.1, and IOS XE 3.1.xSG, allows remote attackers to cause a denial of service (device reload) via a malformed SIP packet to UDP port 5060, aka Bug ID CSCti98219.","published":"2011-10-03T23:55:04.000Z","lastModified":"2026-06-16T23:33:01.000Z","status":"Modified","sourceIdentifier":"psirt@cisco.com","cvss":{"version":"2.0","score":7.8,"severity":"HIGH","vector":"AV:N/AC:L/Au:N/C:N/I:N/A:C"},"cwe":[],"affected":["cisco/ios xe","cisco/ios"],"epss":{"score":0.02556,"percentile":0.84956,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (2.56%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"http://tools.cisco.com/security/center/viewAlert.x?alertId=24121","tags":["Vendor Advisory"],"source":"psirt@cisco.com"},{"url":"http://www.cisco.com/en/US/products/products_security_advisory09186a0080b95d4d.shtml","tags":["Vendor Advisory"],"source":"psirt@cisco.com"},{"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A13781","tags":["Third Party Advisory"],"source":"psirt@cisco.com"},{"url":"http://tools.cisco.com/security/center/viewAlert.x?alertId=24121","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.cisco.com/en/US/products/products_security_advisory09186a0080b95d4d.shtml","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A13781","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2011-3279","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}