CVE-2013-4366
CRITICALCVSS 9.8/10EPSS 2.18%
Last modified
CVE-2013-4366 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 2.18% chance of exploitation in the next 30 days.
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Apache | Httpclient | 4.3 |
References
- https://svn.apache.org/r1528614Issue Tracking, Patch, Release Notes, Vendor Advisory
- https://www.apache.org/dist/httpcomponents/httpclient/RELEASE_NOTES-4.3.x.txtIssue Tracking, Release Notes, Vendor Advisory
- https://svn.apache.org/r1528614Issue Tracking, Patch, Release Notes, Vendor Advisory
- https://www.apache.org/dist/httpcomponents/httpclient/RELEASE_NOTES-4.3.x.txtIssue Tracking, Release Notes, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2013-4366?
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.
How severe is CVE-2013-4366?
CVE-2013-4366 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.18% probability of exploitation in the next 30 days.
How do I fix CVE-2013-4366?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2013-4366?
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Scan your code nowSource: NVD / NIST