Quick answers
- Is CVE-2026-21807 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-21807 being exploited in the wild.
- How severe is CVE-2026-21807?
- Low severity, with a CVSS score of 3.9, published 26 August 2026.
- Which products and versions are affected?
- HCL BigFix Quantum Risk Analyzer.
- Is there a fix for CVE-2026-21807?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-21807 attacked?
- It is attacked with local access, in a network appliance.
- Am I affected by CVE-2026-21807?
- Check whether you run HCL BigFix Quantum Risk Analyzer. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is a stack-based buffer overflow resulting from missing industry-standard binary hardening protections such as ASLR, DEP/NX, or stack canaries. The vulnerable component is the BigFix Quantum Risk Analyzer binary itself. An attacker with the ability to supply specially crafted input to the application could overflow the stack buffer, potentially achieving code execution or denial of service. The attack vector and required preconditions are not fully detailed in the available advisory text. A patch or fix may be available from HCL support.
Affected products
- HCL BigFix Quantum Risk Analyzer
Timeline
- 2026-08-26: disclosed