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CVE-2013-4366

24
FAUCET Score

CVE-2013-4366 describes a critical vulnerability in Apache HttpClient 4.3.x before version 4.3.1, where the http/impl/client/HttpClientBuilder.java component fails to ensure that X509HostnameVerifier is not null, leading to issues with hostname verification. This flaw carries a CVSS v3.1 score of 9.8 (Critical), indicating a severe impact with high confidentiality, integrity, and availability compromise possible through a network-based attack requiring low complexity. Despite its critical severity, there is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
4.3CPE matchmatch criteria
cpe:2.3:a:apache:httpclient:4.3:*:*:*:*:*:*:*
4.3CPE matchmatch criteria
cpe:2.3:a:apache:httpclient:4.3:alpha1:*:*:*:*:*:*
4.3CPE matchmatch criteria
cpe:2.3:a:apache:httpclient:4.3:beta1:*:*:*:*:*:*
4.3CPE matchmatch criteria
cpe:2.3:a:apache:httpclient:4.3:beta2:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.18%
Probability of exploitation in next 30 days
EPSS Percentile
80.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0218 is in the 70th percentile among its peer group of 36,833 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

mavenpatch availablevia ghsa
Product: org.apache.httpcomponents:httpclientFixed in: 4.3.1

Vendor Advisories (1)

mavenGHSA-pqwh-44jj-p5rmcritical

Hostname verification in Apache HttpClient 4.3 was disabled by default

May 13, 2022

References

svn.apache.org / r1528614
Issue TrackingPatchRelease NotesVendor Advisory
apache.org / dist/httpcomponents/httpclient/RELEASE_NOTES-4.3.x.txt
Issue TrackingRelease NotesVendor Advisory