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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 Common Name (CN) or subjectAltName field of the X.509 certificate, which allows man-in-the-middle attackers to spoof SSL servers via an arbitrary valid certificate.
Use CWE-295, Apache vendor hub and Httpclient product page to widen CVE-2012-5783 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2013-4366, CVE-2025-27820 and CVE-2014-3577 for nearby disclosures in the same product family.