CVE-2026-21807: hclsoftware bigfix quantum risk analyzer Stack-based Buffer Overflow

Vulnerability summary

CVE-2026-21807 is a low (CVSS 3.9) Stack-based Buffer Overflow vulnerability in hclsoftware bigfix quantum risk analyzer. EPSS estimates a 0.09% chance of exploitation in the next 30 days, higher than 0.4% of scored vulnerabilities.

Timeline

1. 26-08-2026
   PublishedVulnerability first disclosed.
2. 27-08-2026
   Last modifiedVulnerability information updated.

Description

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.

• CWE-121Stack-based Buffer OverflowA stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).