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CVE Record

CVE-2021-27761: HCL BigFix Platform is affected by weak web transport security

Weak web transport security (Weak TLS): An attacker may be able to decrypt the data using attacks

MediumCVSS 4.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

HCL BigFix Platform had weak web transport security in the listed versions. In practical terms, some management or web traffic may not be protected strongly enough, creating a chance that an attacker could decrypt or tamper with data under difficult network conditions.

Executive priority

Treat this as a medium-priority platform hygiene issue. BigFix is often operationally important, so remediation should be planned and tracked, but the supplied evidence does not support emergency action based on active exploitation.

Technical view

CVE-2021-27761 affects HCL BigFix Platform 9.5 through 9.5.18 and 10 through 10.0.5. The CVSS 3.1 score is 4.8, with network attack vector, high attack complexity, no privileges, no user interaction, and low confidentiality and integrity impact.

Likely exposure

Exposure is most likely where affected BigFix Platform versions remain deployed and web transport is reachable over networks an attacker could observe or influence. The source bundle does not identify specific endpoints, TLS versions, cipher suites, or deployment roles.

Exploitation context

The CVE is not listed as CISA KEV in the supplied data, and no cited source states active exploitation. The CVSS vector indicates exploitation is network-based but high complexity, with limited confidentiality and integrity impact and no availability impact.

Researcher notes

Public data here is sparse. It confirms affected version ranges, weak TLS transport security, CVSS scoring, and HCL advisory reference, but not exact cryptographic weakness, affected endpoints, exploit method, or fixed build details.

Mitigation direction

  • Inventory BigFix Platform versions across servers and management components.
  • Review HCL KB0098116 for vendor-supported remediation guidance.
  • Upgrade or apply fixes only as directed by HCL guidance.
  • Reduce unnecessary network exposure to BigFix web interfaces.
  • Validate TLS posture against organizational cryptographic standards.

Validation and detection

  • Confirm whether any deployment runs versions 9.5-9.5.18 or 10-10.0.5.
  • Check change records for HCL remediation or upgrade completion.
  • Review TLS configuration for weak protocols or ciphers.
  • Verify externally reachable BigFix services are intended and access-controlled.
  • Document compensating controls where immediate remediation is delayed.
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.

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CVE-2021-27761 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
4.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/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
4.8CVSS 3.1MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N2.22.5Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

4.8Medium
CVSS 3.1 vector shape for CVE-2021-27761Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/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 SoftwareBigFix Platform9.5 - 9.5.18, 10 - 10.0.5Listed
Weakness

CWE details

No CWE listed

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