{"cve":"CVE-2013-2099","nvd":{"published":"2013-10-09T14:53:20.230","modified":"2026-06-16T23:52:44.710","status":"Modified","description":"Algorithmic complexity vulnerability in the ssl.match_hostname function in Python 3.2.x, 3.3.x, and earlier, and unspecified versions of python-backports-ssl_match_hostname as used for older Python versions, allows remote attackers to cause a denial of service (CPU consumption) via multiple wildcard characters in the common name in a certificate.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-399"],"references":["http://bugs.python.org/issue17980","http://rhn.redhat.com/errata/RHSA-2014-1690.html","http://secunia.com/advisories/55107","http://secunia.com/advisories/55116","http://www.openwall.com/lists/oss-security/2013/05/16/6"],"products":["canonical:ubuntu_linux","python:python"],"source":"nvd","synced_at":"2026-10-19T20:30:15.895642412+00:00"},"epss":{"cve":"CVE-2013-2099","score":0.04857,"percentile":0.92034,"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."]}