{"cve":"CVE-2011-4231","nvd":{"published":"2012-05-03T10:11:39.687","modified":"2026-06-16T23:34:36.397","status":"Modified","description":"Cisco IOS 15.1 and 15.2 and IOS XE 3.x, when configured as an IPsec hub with X.509 certificates in use, allows remote authenticated users to cause a denial of service (segmentation fault and device crash) via unspecified vectors, aka Bug ID CSCtq61128.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-20"],"references":["http://www.cisco.com/en/US/docs/ios/15_1/release/notes/151-4MCAVS.html","http://www.cisco.com/en/US/docs/ios/ios_xe/3/release/notes/asr1k_caveats_34s.html","http://www.cisco.com/en/US/docs/ios/15_1/release/notes/151-4MCAVS.html","http://www.cisco.com/en/US/docs/ios/ios_xe/3/release/notes/asr1k_caveats_34s.html"],"products":["cisco:ios","cisco:ios_xe"],"source":"nvd","synced_at":"2026-10-19T20:24:00.973572543+00:00"},"epss":{"cve":"CVE-2011-4231","score":0.00587,"percentile":0.48061,"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."]}