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Vulnerability details: VCID-yrbr-vnty-ebfr
Vulnerability ID VCID-yrbr-vnty-ebfr
Aliases CVE-2013-4366
GHSA-pqwh-44jj-p5rm
Summary Improper Input Validation 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.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-20 Improper Input Validation
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.0129 https://api.first.org/data/v1/epss?cve=CVE-2013-4366
epss 0.0129 https://api.first.org/data/v1/epss?cve=CVE-2013-4366
epss 0.0129 https://api.first.org/data/v1/epss?cve=CVE-2013-4366
cvssv3.1_qr CRITICAL https://github.com/advisories/GHSA-pqwh-44jj-p5rm
cvssv3.1 9.8 https://github.com/apache/httpcomponents-client/commit/08140864e3e4c0994e094c4cf0507932baf6a66
generic_textual CRITICAL https://github.com/apache/httpcomponents-client/commit/08140864e3e4c0994e094c4cf0507932baf6a66
cvssv3.1 9.8 https://nvd.nist.gov/vuln/detail/CVE-2013-4366
generic_textual CRITICAL https://nvd.nist.gov/vuln/detail/CVE-2013-4366
cvssv3.1 9.8 http://svn.apache.org/r1528614
generic_textual CRITICAL http://svn.apache.org/r1528614
cvssv3.1 9.8 http://www.apache.org/dist/httpcomponents/httpclient/RELEASE_NOTES-4.3.x.txt
generic_textual CRITICAL http://www.apache.org/dist/httpcomponents/httpclient/RELEASE_NOTES-4.3.x.txt
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2013-4366
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-4366
https://github.com/apache/httpcomponents-client/commit/08140864e3e4c0994e094c4cf0507932baf6a66
http://svn.apache.org/r1528614
http://www.apache.org/dist/httpcomponents/httpclient/RELEASE_NOTES-4.3.x.txt
CVE-2013-4366 https://nvd.nist.gov/vuln/detail/CVE-2013-4366
GHSA-pqwh-44jj-p5rm https://github.com/advisories/GHSA-pqwh-44jj-p5rm
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/apache/httpcomponents-client/commit/08140864e3e4c0994e094c4cf0507932baf6a66
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2013-4366
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at http://svn.apache.org/r1528614
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at http://www.apache.org/dist/httpcomponents/httpclient/RELEASE_NOTES-4.3.x.txt
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.80004
EPSS Score 0.0129
Published At June 4, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-02T04:42:56.424584+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/maven/org.apache.httpcomponents/httpclient/CVE-2013-4366.yml 38.6.0