What is 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.
The record classifies CVE-2026-21807 under weakness class CWE-121. Its CVSS v3 base vector states that the flaw requires local access to the host, needs high-privilege credentials, needs no user interaction. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 40 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 3.9 — LOW
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L - EPSS (FIRST)
- 0.0% probability of exploitation in the next 30 days, higher than 57.2% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 4.2/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2026-08-26, last modified 2026-08-27
Is CVE-2026-21807 being exploited?
It currently carries a trending score of 44 in the Threadlinqs vulnerability feed.
Affected products and versions
- HCLSoftware: BigFix Quantum Risk Analyzer
How to fix CVE-2026-21807
No vendor patch reference has been recorded for CVE-2026-21807 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.
Threat activity tracking CVE-2026-21807
No threat campaign in the Threadlinqs corpus currently references CVE-2026-21807, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.
Sources
Enriched from CVE.org, NVD, FIRST EPSS. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.