CVE-2014-3604 in Not Yet Commons SSL
Summary
by MITRE
Certificates.java in Not Yet Commons SSL before 0.3.15 does not properly verify that the server hostname matches a domain name in the subject s Common Name (CN) field of the X.509 certificate, which allows man-in-the-middle attackers to spoof SSL servers via an arbitrary valid certificate.
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Analysis
by VulDB Data Team • 06/08/2026
The vulnerability described in CVE-2014-3604 resides within the Certificates.java component of the Not Yet Commons SSL library version 0.3.14 and earlier. This flaw represents a critical security weakness in the SSL/TLS certificate validation process that directly impacts the integrity of secure communications. The issue stems from improper implementation of hostname verification during SSL certificate validation, creating a pathway for malicious actors to conduct man-in-the-middle attacks against unsuspecting clients. The vulnerability specifically targets the validation of the Common Name field within X.509 certificates, which should normally contain the domain name that the certificate is intended to secure.
The technical flaw manifests when the library fails to properly validate that the server hostname matches the domain name specified in the certificate's Common Name field. This omission allows attackers to present any valid certificate, regardless of whether it was issued for the target domain, thereby bypassing the fundamental security mechanism that ensures certificate authenticity. The vulnerability is categorized under CWE-295, which specifically addresses improper certificate validation, and aligns with ATT&CK technique T1573.001 for Establishing Persistence through Secure Shell and T1041 for Exfiltration Over C2 Channel. When exploited, this vulnerability enables attackers to intercept and modify communications between clients and servers without detection, as the client's SSL stack accepts the fraudulent certificate as valid.
The operational impact of this vulnerability is severe and far-reaching across multiple security domains. Organizations utilizing affected versions of the Not Yet Commons SSL library become vulnerable to sophisticated attacks where malicious actors can establish fraudulent SSL connections to legitimate services. This weakness particularly affects applications that rely on this library for secure communication, potentially compromising sensitive data transmission, user authentication, and overall system integrity. The vulnerability creates a persistent security risk that can remain undetected for extended periods, as the fraudulent certificates appear legitimate to the client applications. Attackers can exploit this weakness to perform session hijacking, data interception, and credential theft, making it a prime target for cybercriminals seeking to compromise secure communications channels.
Mitigation strategies for CVE-2014-3604 require immediate action to update the Not Yet Commons SSL library to version 0.3.15 or later, which contains the necessary fixes for proper hostname verification. Organizations should conduct comprehensive inventory assessments to identify all systems utilizing the vulnerable library and prioritize remediation efforts accordingly. Additionally, security teams should implement network monitoring solutions to detect potential exploitation attempts and establish robust certificate management practices that include regular validation of SSL certificates. The fix addresses the core issue by implementing proper hostname matching against the Common Name field and potentially the Subject Alternative Name extension, ensuring that certificates are validated against the actual server domain. Security professionals should also consider implementing additional layers of protection such as certificate pinning and enhanced network segmentation to reduce the attack surface and prevent exploitation of similar vulnerabilities in other components of the security infrastructure.