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CVE Record

CVE-2021-27780: HCL BigFix Mobile / Modern Client Management is vulnerable to unauthenticated XML interaction

The software may be vulnerable to both Un-Auth XML interaction and unauthenticated device enrollment.

MediumCVSS 5.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

HCL BigFix Mobile / Modern Client Management versions 1.x and 2.x may allow unauthenticated XML interaction and unauthenticated device enrollment. The published severity is medium, with potential limited data exposure but no stated integrity or availability impact.

Executive priority

Address in the normal vulnerability remediation cycle unless the service is internet-facing or supports sensitive mobile management workflows. Internet exposure increases business urgency because no authentication is required for the reported interaction path.

Technical view

CVE-2021-27780 affects HCL BigFix Mobile / Modern Client Management 1.x and 2.x. CVSS 3.1 is 5.3: network-accessible, low complexity, no privileges, no user interaction, unchanged scope, low confidentiality impact, and no integrity or availability impact. CWE-112 is listed.

Likely exposure

Exposure is most relevant where BigFix Mobile or Modern Client Management enrollment or XML-facing services are reachable from untrusted networks. The source bundle does not identify specific endpoints, configurations, or fixed versions.

Exploitation context

The source bundle does not report active exploitation, and KEV status is false. Treat this as a remotely reachable unauthenticated exposure concern, but do not assume exploitation without additional vendor or threat intelligence confirmation.

Researcher notes

Evidence is limited to the CVE description, CVSS vector, affected product versions, CWE, and HCL advisory reference. The bundle does not provide endpoint details, proof-of-concept status, exploit telemetry, or named fixed releases.

Mitigation direction

  • Review HCL KB0098028 for vendor remediation and supported fixed-version guidance.
  • Inventory all BigFix Mobile / Modern Client Management 1.x and 2.x deployments.
  • Limit access to management, enrollment, and XML-facing services to trusted networks.
  • Prioritize upgrade or configuration changes explicitly recommended by HCL.
  • Monitor vendor advisories for updated remediation details.

Validation and detection

  • Confirm whether any deployed instance runs affected 1.x or 2.x versions.
  • Identify externally reachable BigFix Mobile or Modern Client Management services.
  • Review logs for unexpected enrollment or XML interaction patterns.
  • Verify vendor-recommended remediation is applied after consulting HCL guidance.
  • Document any compensating controls restricting unauthenticated network access.
Prepared
Confidence
medium
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-112: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2021-27780 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.3 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
5.3CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N3.91.4Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

5.3Medium
CVSS 3.1 vector shape for CVE-2021-27780Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
HCL SoftwareHCL BigFix Mobile / Modern Client Management1.x, 2.xListed
Weakness

CWE details

CWE-112

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-112 · source CWE mapping

Missing XML Validation

Missing XML Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs