CVE-2026-21807 in Quantum Risk Analyzer
Summary
by MITRE • 08/27/2026
HCL BigFix Quantum Risk Analyzer binary lacks several critical, industry-standard hardening protections that could allow an attacker to cause a stack-based buffer overflow.
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Analysis
by VulDB Data Team • 08/27/2026
The vulnerability identified in the HCL BigFix Quantum Risk Analyzer executable stems from the absence of essential memory safety mechanisms typically employed during software compilation and linking processes. Specifically, the binary lacks critical hardening features such as Stack Canaries (Stack Protection), Address Space Layout Randomization (ASLR) support indicators, or Data Execution Prevention (DEP/NX bit) compatibility flags that are standard in modern secure development lifecycles. These protections serve as a last line of defense against memory corruption attacks by detecting stack-based buffer overflows before they can be exploited and preventing the execution of injected malicious code within data segments. The absence of these indicators suggests either a legacy build configuration or an oversight during the release process, leaving the application vulnerable to classic exploitation techniques that rely on manipulating control flow through overwritten return addresses or function pointers.
From a technical perspective, this deficiency directly facilitates stack-based buffer overflow attacks as described in CWE-121: Stack-based Buffer Overflow. When an attacker provides input data exceeding the allocated buffer size on the call stack, the excess data overwrites adjacent memory locations, including critical control structures such as the saved base pointer and return address. Without stack canaries to detect this corruption before function execution returns, or without DEP preventing code execution in non-executable memory regions like the stack, an attacker gains precise control over the program's instruction pointer. This allows for arbitrary code execution within the context of the running process, potentially leading to full system compromise depending on the privileges under which HCL BigFix Quantum Risk Analyzer operates.
The operational impact of this vulnerability is severe given the nature of HCL BigFix as a critical IT infrastructure management tool. If an attacker successfully exploits this buffer overflow through local or remote input vectors, they could execute arbitrary commands with the same permissions as the application user. This could lead to unauthorized access to sensitive configuration data, manipulation of risk assessment metrics, or use of the compromised system as a pivot point for further network intrusion. The lack of hardening increases the attack surface significantly, making exploitation more reliable and reducing the effort required by threat actors compared to systems with robust memory protection mechanisms in place.
Mitigation strategies should focus on both immediate remediation and long-term architectural improvements. Immediate steps include applying any available patches from HCL that rebuild the binary with proper security flags enabled. In the interim, administrators should restrict access to the Quantum Risk Analyzer interface to trusted networks only, minimizing exposure to potential attackers. From a development standpoint, it is imperative to enforce secure coding standards such as those outlined in CWE-120 and ensure all binaries are compiled with modern compiler protections including /GS for stack cookies on Windows or -fstack-protector-strong on Linux environments. Additionally, enabling DEP/NX at the OS level provides an additional layer of defense by marking memory pages containing data as non-executable, thereby neutralizing code injection attempts even if a buffer overflow occurs. Regular security audits and static analysis tools should be integrated into the CI/CD pipeline to detect such missing hardening features before deployment aligning with ATT&CK techniques related to initial access and execution via software vulnerabilities.