CVE-2021-27780Network attack vector

Unauthenticated device enrollment via missing XML validation

Published May 27, 2022 · Updated Sep 16, 2024

Missing XML validation in HCL Software BigFix Mobile and Modern Client Management before 2.1 allows remote attackers to enroll devices. HCL Software has not published the XML-processing locus or the validation omitted before enrollment requests are accepted. No authentication or user interaction is required, but HCL has not identified the exposed information or any effect beyond enrollment.

CVSS severity5.3
Medium
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing XML validation in HCL Software BigFix Mobile and Modern Client Management before 2.1 allows remote attackers to enroll devices. HCL Software has not published the XML-processing locus or the validation omitted before enrollment requests are accepted. No authentication or user interaction is required, but HCL has not identified the exposed information or any effect beyond enrollment.

The record

CVE
CVE-2021-27780
Published
May 27, 2022
Updated
Sep 16, 2024
Vendor
HCL Software
Product
BigFix Mobile and Modern Client Management
Classifications
CWE-112, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 27, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.x, 2.x

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

HCL Software · BigFix Mobile and Modern Client Managementversion=1.x, 2.x

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
5.3HCL SoftwareCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-112Missing XML Validation
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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