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CVE Record

CVE-2021-30531: Insufficient policy enforcement in Content Security Policy in Google Chrome prior to 91.0.4472.77 allowed a...

Insufficient policy enforcement in Content Security Policy in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to bypass content security policy via a crafted HTML page.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This Chrome vulnerability could let a malicious web page bypass Content Security Policy protections. CSP is a browser control used to limit what page content can run or load. The public record names Chrome before 91.0.4472.77. No active exploitation evidence is provided in the bundle.

Executive priority

Treat as a browser hygiene issue with unknown severity, not as a confirmed emergency from the provided evidence. Prioritize normal browser patch compliance and focus on unmanaged endpoints, legacy Linux packages, and environments where web browsing risk is high.

Technical view

CVE-2021-30531 is insufficient policy enforcement in Chrome Content Security Policy handling. A remote attacker could bypass CSP through a crafted HTML page. The bundle does not provide CVSS, CWE, detailed root cause, or complete affected-version data beyond Chrome prior to 91.0.4472.77.

Likely exposure

Exposure is likely limited to endpoints or packaged Chromium builds running Chrome or Chromium before the fixed 91.0.4472.77-era updates. Risk depends on user browsing activity and whether internal or third-party applications rely on CSP as a meaningful containment control.

Exploitation context

The provided sources describe remote exploitation via a crafted HTML page but do not show public exploit availability or confirmed in-the-wild use. CISA KEV status is false in the bundle, so active exploitation should not be asserted from this evidence.

Researcher notes

The public bundle is sparse: no CVSS, no CWE, no detailed affected-version range, and likely limited bug details from the Chromium tracker. Analysis should remain constrained to CSP bypass impact and fixed Chrome release evidence.

Mitigation direction

  • Update Google Chrome to 91.0.4472.77 or later where applicable.
  • Apply relevant Chromium package updates from Gentoo or Fedora advisories.
  • Confirm enterprise browser management enforces minimum fixed versions.
  • Check current vendor guidance for platform-specific remediation details.

Validation and detection

  • Inventory Chrome and Chromium versions across managed endpoints.
  • Flag any Chrome builds older than 91.0.4472.77.
  • Verify Linux distribution package versions against Gentoo or Fedora advisories.
  • Review high-risk web apps that rely heavily on CSP containment.
Prepared
Confidence
medium
Sources
7

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

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CVE-2021-30531 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
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.

0CVSS vectors
0Timeline events
0ADP providers
6Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
GoogleChromeunspecifiedListed
Weakness

CWE details

No CWE listed

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