{"cve":"CVE-2013-6890","nvd":{"published":"2013-12-23T22:55:03.050","modified":"2026-06-17T00:01:05.543","status":"Modified","description":"denyhosts 2.6 uses an incorrect regular expression when analyzing authentication logs, which allows remote attackers to cause a denial of service (incorrect block of IP addresses) via crafted login names.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-287"],"references":["http://seclists.org/oss-sec/2013/q4/535","http://secunia.com/advisories/56239","http://www.debian.org/security/2013/dsa-2826","https://bugzilla.redhat.com/show_bug.cgi?id=1045982","http://seclists.org/oss-sec/2013/q4/535"],"products":["debian:debian_linux","fedoraproject:fedora","phil_schwartz:denyhosts"],"source":"nvd","synced_at":"2026-10-19T20:30:15.895642412+00:00"},"epss":{"cve":"CVE-2013-6890","score":0.08896,"percentile":0.9523,"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."]}