{"cve":"CVE-2013-4366","nvd":{"published":"2017-10-30T19:29:00.280","modified":"2026-06-16T23:57:06.300","status":"Modified","description":"http/impl/client/HttpClientBuilder.java in Apache HttpClient 4.3.x before 4.3.1 does not ensure that X509HostnameVerifier is not null, which allows attackers to have unspecified impact via vectors involving hostname verification.","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-20"],"references":["http://svn.apache.org/r1528614","http://www.apache.org/dist/httpcomponents/httpclient/RELEASE_NOTES-4.3.x.txt","http://svn.apache.org/r1528614","http://www.apache.org/dist/httpcomponents/httpclient/RELEASE_NOTES-4.3.x.txt"],"products":["apache:httpclient"],"source":"nvd","synced_at":"2026-10-19T20:47:01.408438353+00:00"},"epss":{"cve":"CVE-2013-4366","score":0.03309,"percentile":0.88552,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-pqwh-44jj-p5rm","url":"https://osv.dev/vulnerability/GHSA-pqwh-44jj-p5rm","summary":"Hostname verification in Apache HttpClient 4.3 was disabled by default","modified":"2024-03-05T17:33:19.157465Z","packages":[{"ecosystem":"Maven","name":"org.apache.httpcomponents:httpclient","purl":"pkg:maven/org.apache.httpcomponents/httpclient","ranges":[">=4.3 <4.3.1"],"fixed":["4.3.1"]}]}],"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."]}