Apache Httpclient vulnerabilities

10 CVEs affecting Apache Httpclient, 0 known to be exploited (CISA KEV), with EPSS scores. Latest: CVE-2026-71290, published 2026-08-11.

Highest priority

Known exploited (CISA KEV) first, then by EPSS exploit probability.

CVE-2015-5262, published 2015-10-27. Medium severity, CVSS 4.3. EPSS: 18.8% chance of exploitation in the next 30 days. http/conn/ssl/SSLConnectionSocketFactory.java in Apache HttpComponents HttpClient before 4.3.6 ignores the http.socket.timeout configuration setting during an SSL handshake, which allows remote…
CVE-2012-5783, published 2012-11-04. Medium severity, CVSS 5.8. EPSS: 9.2% chance of exploitation in the next 30 days. Apache Commons HttpClient 3.x, as used in Amazon Flexible Payments Service (FPS) merchant Java SDK and other products, does not verify that the server hostname matches a domain name in the subject's…
CVE-2014-3577, published 2014-08-21. Medium severity, CVSS 5.8. EPSS: 9.2% chance of exploitation in the next 30 days. org.apache.http.conn.ssl.AbstractVerifier in Apache HttpComponents HttpClient before 4.3.5 and HttpAsyncClient before 4.0.2 does not properly verify that the server hostname matches a domain name in…
CVE-2020-13956, published 2020-12-02. Medium severity, CVSS 5.3. EPSS: 9% chance of exploitation in the next 30 days. Apache HttpClient versions prior to version 4.5.13 and 5.0.3 can misinterpret malformed authority component in request URIs passed to the library as java.net.URI object and pick the wrong target host…
CVE-2011-1498, published 2011-07-07. Medium severity, CVSS 4.3. EPSS: 6.7% chance of exploitation in the next 30 days. Apache HttpClient 4.x before 4.1.1 in Apache HttpComponents, when used with an authenticating proxy server, sends the Proxy-Authorization header to the origin server, which allows remote web servers…
CVE-2013-4366, published 2017-10-30. Critical severity, CVSS 9.8. EPSS: 3.3% chance of exploitation in the next 30 days. 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…
CVE-2025-27820, published 2025-04-24. High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days. A bug in PSL validation logic in Apache HttpClient 5.4.x disables domain checks, affecting cookie management and host name verification. Discovered by the Apache HttpClient team. Fixed in the 5.4.3…
CVE-2026-40542, published 2026-04-22. High severity, CVSS 7.3. EPSS: 0.7% chance of exploitation in the next 30 days. Missing critical step in authentication in Apache HttpClient 5.6 allows an attacker to cause the client to accept SCRAM-SHA-256 authentication without proper mutual authentication verification. Users…
CVE-2026-64607, published 2026-07-31. Medium severity, CVSS 5.3. EPSS: 0.5% chance of exploitation in the next 30 days. HttpClient based on the classic i/o model fails to correctly release the underlying connection back to the connection manager if it encounters an invalid or unsupported `Content-Encoding` header…
CVE-2026-71290, published 2026-08-11. Critical severity, CVSS 9.1. EPSS: 0.3% chance of exploitation in the next 30 days. Improper TLS hostname verification vulnerability in Apache HttpComponents Client 5.4 or newer. HostnameVerificationPolicy#BUILTIN setting has no effect when used with the async version of HttpClient.…