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CVE-2026-21807— HCL BigFix Quantum Risk Analyzer is affected by a stack-based buffer overflow

Quick assessment

Affected
HCLSoftware BigFix Quantum Risk Analyzer
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

HCL BigFix Quantum Risk Analyzer 二进制文件缺少多项关键的、符合行业标准的加固保护措施，这可能允许攻击者触发基于栈的缓冲区溢出漏洞。

CVSS 3.9 · Low

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth
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I. Basic Information for CVE-2026-21807

Vulnerability Information
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Vulnerability Title
HCL BigFix Quantum Risk Analyzer is affected by a stack-based buffer overflow
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
HCLSoftware BigFix Quantum Risk Analyzer 2.0.1.47 -

II. Public POCs for CVE-2026-21807

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III. Intelligence Information for CVE-2026-21807

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Vendor Advisories for CVE-2026-21807 (1)

Same Patch Batch · HCLSoftware · 2026-08-26 · 6 CVEs total

CVE-2026-21810 4.4 MEDIUM HCL BigFix Quantum Risk Analyzer is affected by a hardcoded external resource reference an
CVE-2026-21808 4.1 MEDIUM HCL BigFix Quantum Risk Analyzer is affected by logging sensitive information
CVE-2026-21809 3.9 LOW HCL BigFix Quantum Risk Analyzer is affected by generating error messages with sensitive i
CVE-2025-62341 3.7 LOW HCL Connections is vulnerable to server-side request forgery (SSRF)
CVE-2026-56547 3.5 LOW An input reflection vulnerability affects HCL Traveler

IV. Related Vulnerabilities

Same product: BigFix Quantum Risk Analyzer
Same vendor: HCLSoftware
Same weakness: CWE-121

V. Comments for CVE-2026-21807

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