{"cve":"CVE-2011-2581","nvd":{"published":"2011-09-14T16:05:23.603","modified":"2026-06-16T23:31:35.740","status":"Modified","description":"The ACL implementation in Cisco NX-OS 5.0(2) and 5.0(3) before 5.0(3)N2(1) on Nexus 5000 series switches, and NX-OS before 5.0(3)U1(2a) on Nexus 3000 series switches, does not properly handle comments in conjunction with deny statements, which allows remote attackers to bypass intended access restrictions in opportunistic circumstances by sending packets, aka Bug IDs CSCto09813 and CSCtr61490.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-264"],"references":["http://secunia.com/advisories/45883","http://www.cisco.com/en/US/products/products_security_advisory09186a0080b9250c.shtml","http://www.securitytracker.com/id?1026019","http://secunia.com/advisories/45883","http://www.cisco.com/en/US/products/products_security_advisory09186a0080b9250c.shtml"],"products":["cisco:nexus_3000","cisco:nexus_5000","cisco:nx-os"],"source":"nvd","synced_at":"2026-10-19T19:58:50.521460154+00:00"},"epss":{"cve":"CVE-2011-2581","score":0.01992,"percentile":0.80684,"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."]}