{"id":"CVE-2011-2395","url":"https://www.cyber-defence.io/tools/cve/CVE-2011-2395","generatedAt":"2026-10-27T23:08:34.423Z","title":"The Neighbor Discovery (ND) protocol implementation in Cisco IOS on unspecified switches allows remote attackers to bypass the Router Advertisement Guarding functionality via a fragmented IPv6 packet in which the Router Advertisement (RA) message is…","description":"The Neighbor Discovery (ND) protocol implementation in Cisco IOS on unspecified switches allows remote attackers to bypass the Router Advertisement Guarding functionality via a fragmented IPv6 packet in which the Router Advertisement (RA) message is contained in the second fragment, as demonstrated by (1) a packet in which the first fragment contains a long Destination Options extension header or (2) a packet in which the first fragment contains an ICMPv6 Echo Request message.","published":"2011-06-09T02:38:42.000Z","lastModified":"2026-06-16T23:31:15.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"2.0","score":5,"severity":"MEDIUM","vector":"AV:N/AC:L/Au:N/C:N/I:P/A:N"},"cwe":["CWE-16"],"affected":["cisco/ios"],"epss":{"score":0.0229,"percentile":0.83099,"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":"low","text":"Lower severity and a low EPSS score (2.29%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"http://seclists.org/fulldisclosure/2011/May/446","source":"cve@mitre.org"},{"url":"http://securityreason.com/securityalert/8271","source":"cve@mitre.org"},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/67940","source":"cve@mitre.org"},{"url":"http://seclists.org/fulldisclosure/2011/May/446","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://securityreason.com/securityalert/8271","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/67940","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2011-2395","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."}