CVE-2025-33121 in QRadar SIEM
Summary
by MITRE • 06/19/2025
IBM QRadar SIEM 7.5 through 7.5.0 Update Package 12 is vulnerable to an XML external entity injection (XXE) attack when processing XML data. A remote attacker could exploit this vulnerability to expose sensitive information or consume memory resources.
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Analysis
by VulDB Data Team • 08/24/2025
IBM QRadar SIEM version 7.5 through 7.5.0 Update Package 12 contains a critical XML external entity injection vulnerability that represents a significant security risk to organizations relying on this security information and event management platform. This vulnerability falls under the Common Weakness Enumeration category CWE-611, which specifically addresses improper restriction of XML external entities, making it a well-documented and dangerous flaw in web application security. The XXE vulnerability exists within the XML processing functionality of the QRadar SIEM system, where the application fails to properly validate or sanitize XML input before parsing, allowing malicious actors to inject external entity references that can be exploited for information disclosure and resource exhaustion attacks.
The technical exploitation of this vulnerability occurs when the QRadar SIEM system processes XML data that contains external entity declarations or references. An attacker can craft malicious XML payloads that include external entity references pointing to internal network resources, local files, or even external servers controlled by the attacker. When the system processes this malformed XML data, it will attempt to resolve these external entities, potentially exposing sensitive system information such as internal file structures, configuration details, or even credentials stored in accessible files. The vulnerability is particularly dangerous because it allows for both information disclosure and denial of service attacks, as the XML parser can be made to consume excessive memory resources when processing maliciously crafted entities, leading to system performance degradation or complete service disruption.
From an operational impact perspective, this vulnerability presents a severe threat to organizations using IBM QRadar SIEM as their primary security monitoring solution. The remote exploitation capability means that attackers do not require physical access to the system or network, making this vulnerability particularly attractive for automated attacks. Security teams responsible for monitoring and protecting their organizations against cyber threats could find their SIEM system compromised, potentially leading to undetected malicious activity while the system itself is being used as a pivot point for further attacks. The vulnerability affects the core functionality of the SIEM platform, which processes vast amounts of security event data, making it a prime target for attackers seeking to gain unauthorized access to security monitoring capabilities or to disrupt critical security operations.
Organizations should implement immediate mitigations including applying the latest IBM security patches and updates specifically addressing this XXE vulnerability, as well as implementing network-level controls to restrict XML processing capabilities where possible. The mitigation strategy should also include monitoring for unusual XML processing patterns and implementing proper input validation for all XML data entering the system. According to the MITRE ATT&CK framework, this vulnerability maps to techniques involving exploitation of remote services and privilege escalation through information gathering, making it a significant vector for attackers seeking to establish persistent access or move laterally within compromised networks. Security administrators should also consider implementing web application firewalls and XML validation rules to prevent malformed XML data from reaching the vulnerable processing components, while maintaining comprehensive logging and monitoring to detect potential exploitation attempts.