Buffer overflow in Hclsoftware Bigfix Quantum Risk Analyzer

CVE-2026-21807

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.

Vulnerability class: Buffer Overflow

Published · last modified .

CVSS v3 metric

CVSS v3 base score 3.9 (Low). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.001 (0.5th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 0th percentile — 0.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-21807: held from 0.001 to 0.001.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: 0.000

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-21807?
CVE-2026-21807 is a low-severity vulnerability in Hclsoftware Bigfix Quantum Risk Analyzer, classified under Stack-based Buffer Overflow. CVSS score: 3.9/10. Published 2026-08-26.
How severe is CVE-2026-21807?
Low severity. CVSS v3 base score is 3.9 out of 10.