{"cve":"CVE-2011-2395","nvd":{"published":"2011-06-09T02:38:41.790","modified":"2026-06-16T23:31:15.003","status":"Modified","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.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-16"],"references":["http://seclists.org/fulldisclosure/2011/May/446","http://securityreason.com/securityalert/8271","https://exchange.xforce.ibmcloud.com/vulnerabilities/67940","http://seclists.org/fulldisclosure/2011/May/446","http://securityreason.com/securityalert/8271"],"products":["cisco:ios"],"source":"nvd","synced_at":"2026-10-19T19:58:50.521460154+00:00"},"epss":{"cve":"CVE-2011-2395","score":0.0229,"percentile":0.83221,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}