CVE-2014-2682 in Zend
Summary
by MITRE
Zend Framework 1 (ZF1) before 1.12.4, Zend Framework 2 before 2.1.6 and 2.2.x before 2.2.6, ZendOpenId, ZendRest, ZendService_AudioScrobbler, ZendService_Nirvanix, ZendService_SlideShare, ZendService_Technorati, and ZendService_WindowsAzure before 2.0.2, ZendService_Amazon before 2.0.3, and ZendService_Api before 1.0.0, when PHP-FPM is used, does not properly share the libxml_disable_entity_loader setting between threads, which might allow remote attackers to conduct XML External Entity (XXE) attacks via an XML external entity declaration in conjunction with an entity reference. NOTE: this issue exists because of an incomplete fix for CVE-2012-5657.
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Analysis
by VulDB Data Team • 06/18/2026
The vulnerability described in CVE-2014-2682 represents a critical security flaw affecting multiple components of the Zend Framework ecosystem, specifically impacting versions prior to the mentioned patches. This issue manifests when the Zend Framework is deployed in environments utilizing PHP-FPM (FastCGI Process Manager), creating a dangerous condition where the libxml_disable_entity_loader setting fails to properly propagate across different threads within the PHP process. The root cause stems from an incomplete remediation of CVE-2012-5657, leaving a persistent weakness that attackers can exploit to conduct XML External Entity attacks. The vulnerability is particularly concerning because it affects widely used framework components including ZendOpenId, ZendRest, and various ZendService modules that handle external API communications and data processing.
The technical implementation of this flaw occurs at the threading level within PHP-FPM environments where multiple worker processes may not inherit or properly synchronize the libxml_disable_entity_loader configuration. When this setting is not consistently shared across threads, XML parsing operations become vulnerable to XXE attacks, allowing remote attackers to reference external entities and potentially access local files, perform port scanning, or even execute arbitrary code depending on the system configuration. The attack vector requires an XML payload containing external entity declarations combined with entity references that can be processed by the vulnerable Zend Framework components. This weakness specifically impacts applications that process external XML data through the affected framework modules, making it particularly dangerous for web services, API gateways, and applications that consume XML feeds or user-provided XML content.
The operational impact of this vulnerability extends beyond simple data exposure, potentially enabling attackers to escalate privileges, access sensitive system information, or disrupt service availability through resource exhaustion attacks. Applications using the affected Zend Framework versions in PHP-FPM deployments become prime targets for attackers seeking to exploit XXE vulnerabilities, especially in environments where the framework components handle user input or external data sources. The vulnerability affects not just individual applications but entire frameworks, meaning organizations with multiple applications using these components face widespread exposure. This issue particularly impacts enterprise systems that rely on Zend Framework for building web applications and services, where the combination of PHP-FPM and vulnerable framework components creates an attack surface that can be exploited to gain unauthorized access to backend systems.
Mitigation strategies for CVE-2014-2682 require immediate patching of all affected Zend Framework components to their respective secure versions, with particular attention to the specific version requirements mentioned for each module. Organizations should implement comprehensive vulnerability management processes to identify all systems using affected framework versions and ensure proper patch deployment across their infrastructure. Additionally, implementing proper input validation and sanitization practices can provide defense-in-depth measures, though these should not be considered substitutes for proper patching. Network segmentation and access controls can help limit the potential impact of successful exploitation, while monitoring systems should be configured to detect unusual XML processing activities that might indicate XXE attack attempts. Security teams should also consider implementing automated vulnerability scanning tools that can identify affected framework versions in their environments, and the remediation process should include thorough testing to ensure that patches do not introduce regressions in application functionality. This vulnerability aligns with CWE-611 (Improper Restriction of XML External Entity Reference) and maps to ATT&CK technique T1213.002 (Data from Information Repositories) when exploited for information gathering purposes, highlighting the importance of addressing such vulnerabilities through both immediate remediation and long-term security process improvements.