{"cve":"CVE-2018-21246","nvd":{"published":"2020-06-15T17:15:09.620","modified":"2026-06-17T01:54:27.760","status":"Modified","description":"Caddy before 0.10.13 mishandles TLS client authentication, as demonstrated by an authentication bypass caused by the lack of the StrictHostMatching mode.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-287"],"references":["https://bugs.gentoo.org/715214","https://github.com/caddyserver/caddy/releases/tag/v0.10.13","https://bugs.gentoo.org/715214","https://github.com/caddyserver/caddy/releases/tag/v0.10.13"],"products":["caddyserver:caddy"],"source":"nvd","synced_at":"2026-10-19T21:05:42.039641217+00:00"},"epss":{"cve":"CVE-2018-21246","score":0.02723,"percentile":0.86051,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-gr7w-x2jp-3xgw","url":"https://osv.dev/vulnerability/GHSA-gr7w-x2jp-3xgw","summary":"Caddy vulnerable to Authentication Bypass due to mishandling of TLS client authentication","modified":"2023-11-08T04:00:14.482973Z","packages":[{"ecosystem":"Go","name":"github.com/caddyserver/caddy","purl":"pkg:golang/github.com/caddyserver/caddy","ranges":["<0.10.13"],"fixed":["0.10.13"]}]},{"id":"GO-2020-0043","url":"https://osv.dev/vulnerability/GO-2020-0043","summary":"Authentication bypass in github.com/mholt/caddy","modified":"2024-05-20T16:03:47Z","packages":[{"ecosystem":"Go","name":"github.com/mholt/caddy","purl":"pkg:golang/github.com/mholt/caddy","ranges":["<0.10.13"],"fixed":["0.10.13"]}]}],"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."]}