Hostname verification in Apache HttpClient 4.3 was disabled by default

published 2017-10-30 9 y ago modified 2026-06-16 4 mo ago also GHSA-pqwh-44jj-p5rm , EUVD-2022-4812

cvss: 9.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 3.3%; EPSS 3.3% chance of exploitation in 30 days, percentile 88%
public exploits: 0; none known

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.

Patch / fix

fixed in 1 distros 1 links 2

maven org.apache.httpcomponents:httpclient 4.3.1

httpcomponents-client Debian 14, Debian 13, Debian 12 4.3.2-1

debian advisories DEBIAN-CVE-2013-4366

github.com/apache/httpcomponents-client@0814086 commit
svn.apache.org/r1528614 advisory

Exploit prediction

3.31% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	7.5	AV:N/AC:L/Au:N/C:P/I:P/A:P
GitHub	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
maven	org.apache.httpcomponents:httpclient	>=4.3, <4.3.1	4.3.1

Classification

Weakness

CWE-20 Improper Input Validation

References

svn.apache.org /r1528614
web, issue-tracking, patch, release-notes, vendor-advisory
github.com /apache/httpcomponents-client/commit/08140864e3e4c0994e094c4cf0507932baf6a66
web
apache.org /dist/httpcomponents/httpclient/RELEASE_NOTES-4.3.x.txt
web, issue-tracking, release-notes, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2013-4366
advisory

Sources

CVE List CVE-2013-4366
GitHub Advisory GHSA-pqwh-44jj-p5rm
NVD CVE-2013-4366

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary