CVE-2026-21840— HCL BigFix Platform is affected by a user enumeration vulnerability
Quick assessment
Affected
HCLSoftware HCL BigFix Platform
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 HCL BigFix Platform是印度HCL公司的一款终端安全与系统管理平台。 HCL BigFix Platform存在侧信道信息泄露漏洞，该漏洞源于用户枚举问题，可能导致攻击者通过系统控制和响应时间监控对BigFix服务进行用户枚举。以下版本受到影响：10.0.0版本至10.0.15版本和11.0.0版本至11.0.5版本。
Possible ATT&CK Techniques 1 AI
T1595 · Active ScanningAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| HCLSoftware | HCL BigFix Platform | 10.0.0 - 10.0.15, 11.0.0 - 11.0.5 |
affected |
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I. Basic Information for CVE-2026-21840
Vulnerability Information
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Vulnerability Title
HCL BigFix Platform is affected by a user enumeration vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
HCL BigFix Platform is affected by a user enumeration vulnerability which might allow an attacker, through careful system control and response time monitoring, to perform some level of user enumeration for the BigFix service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过时间差异性导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
HCL BigFix Platform 侧信道信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
HCL HCL BigFix Platform是印度HCL公司的一款终端安全与系统管理平台。 HCL BigFix Platform存在侧信道信息泄露漏洞，该漏洞源于用户枚举问题，可能导致攻击者通过系统控制和响应时间监控对BigFix服务进行用户枚举。以下版本受到影响：10.0.0版本至10.0.15版本和11.0.0版本至11.0.5版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| HCLSoftware | HCL BigFix Platform | 10.0.0 - 10.0.15, 11.0.0 - 11.0.5 | - |
|
II. Public POCs for CVE-2026-21840
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-21840 (1)
IV. Related Vulnerabilities
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V. Comments for CVE-2026-21840
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