{"cve":"CVE-2011-2059","nvd":{"published":"2011-10-22T02:59:19.323","modified":"2026-06-16T23:30:38.247","status":"Modified","description":"The ipv6 component in Cisco IOS before 15.1(4)M1.3 allows remote attackers to conduct fingerprinting attacks and obtain potentially sensitive information about the presence of the IOS operating system via an ICMPv6 Echo Request packet containing a Hop-by-Hop (HBH) extension header (EH) with a 0x0c01050c value in the PadN option data, aka Bug ID CSCtq02219.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-200"],"references":["http://blogs.cisco.com/security/1999tcp-redux-the-ipv6-flavor","http://tools.cisco.com/security/center/viewIpsSignature.x?signatureId=36606&signatureSubId=0","http://blogs.cisco.com/security/1999tcp-redux-the-ipv6-flavor","http://tools.cisco.com/security/center/viewIpsSignature.x?signatureId=36606&signatureSubId=0"],"products":["cisco:ios"],"source":"nvd","synced_at":"2026-10-19T19:59:31.623151214+00:00"},"epss":{"cve":"CVE-2011-2059","score":0.01557,"percentile":0.75191,"date":"2026-11-01"},"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."]}