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CVE Record

CVE-2021-27764: HCL BigFix WebUI Cookie missing attributes

Cookie without HTTPONLY flag set. NUMBER cookie(s) was set without Secure or HTTPOnly flags. The images show the cookie with the missing flag. (WebUI)

HighCVSS 7.4Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

HCL BigFix WebUI set one or more cookies without Secure or HTTPOnly protections. That can make session-related data easier to steal through browser-side scripting or unsafe transport conditions. The reported impact is confidentiality-focused, not integrity or availability.

Executive priority

Treat this as a high-priority confidentiality issue for BigFix administration portals, especially where WebUI is reachable by many users or over less trusted networks. Confirm vendor remediation and validate cookie behavior after change.

Technical view

CVE-2021-27764 is a CWE-614 cookie attribute weakness in HCL BigFix WebUI versions 9.0 and 10.0. CVSS 3.1 is 7.4, with network access, low complexity, no privileges, required user interaction, changed scope, and high confidentiality impact.

Likely exposure

Exposure is limited to organizations running HCL BigFix WebUI 9.0 or 10.0. The source bundle does not identify other affected HCL BigFix components or CPEs, so do not broaden scope without vendor confirmation.

Exploitation context

The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The CVSS vector requires user interaction, suggesting exploitation depends on a victim browser context rather than direct unauthenticated server compromise.

Researcher notes

Evidence is sparse: the CVE description identifies missing Secure or HTTPOnly cookie flags in WebUI, but the bundle does not include patch version details, exploit evidence, or affected CPEs. Keep analysis constrained to HCL BigFix WebUI 9.0 and 10.0.

Mitigation direction

  • Review HCL KB0097778 for the vendor-approved fix or workaround.
  • Prioritize remediation for internet-facing or broadly reachable WebUI instances.
  • Restrict WebUI access to trusted administrative networks where feasible.
  • Confirm cookies use Secure and HttpOnly after applying vendor guidance.

Validation and detection

  • Inventory HCL BigFix WebUI versions and identify 9.0 or 10.0 deployments.
  • Inspect authorized WebUI Set-Cookie headers for missing Secure or HttpOnly attributes.
  • Check whether the instance is exposed beyond trusted administrative users.
  • Document remediation status against HCL KB0097778.
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-614: 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.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2021-27764 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
High
CVSS
7.4 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/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
7.4CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N2.84Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

7.4High
CVSS 3.1 vector shape for CVE-2021-27764Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/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 WebUI9.0, 10.0Listed
Weakness

CWE details

CWE-614

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

CWE-614 · source CWE mapping

Sensitive Cookie in HTTPS Session Without 'Secure' Attribute

Sensitive Cookie in HTTPS Session Without 'Secure' Attribute represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs