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CVE Record

CVE-2021-30524: Use after free in TabStrip in Google Chrome prior to 91.0.4472.77 allowed an attacker who convinced a user...

Use after free in TabStrip in Google Chrome prior to 91.0.4472.77 allowed an attacker who convinced a user to install a malicious extension to potentially exploit heap corruption via a crafted HTML page.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-30524 is a Chrome memory-safety flaw in TabStrip. In Chrome versions before 91.0.4472.77, an attacker who first persuades a user to install a malicious extension could use a crafted HTML page to trigger heap corruption. The provided sources do not show active exploitation.

Executive priority

Treat as a browser hygiene and endpoint control issue. Prioritize patching outdated Chrome installations and tightening extension governance, especially in environments where users can install extensions without approval.

Technical view

The CVE describes a use-after-free vulnerability in Google Chrome TabStrip before 91.0.4472.77. The stated attack path requires a malicious extension and crafted HTML, with potential heap corruption. Public details in the provided bundle are limited, and no CVSS, CWE, or exploit confirmation is supplied.

Likely exposure

Organizations with Chrome or Chromium-derived packages older than 91.0.4472.77 are the relevant exposure group. Practical risk is higher where users can install arbitrary browser extensions or where extension allowlisting is weak.

Exploitation context

The documented path requires user interaction: convincing a user to install a malicious extension, then processing crafted HTML. The source bundle does not cite CISA KEV listing or other evidence of active exploitation.

Researcher notes

The public CVE text names TabStrip use-after-free and heap corruption but gives limited technical detail. crbug is referenced, but the bundle provides no exploit, CVSS vector, CWE, or confirmed active exploitation. Avoid assumptions beyond the malicious-extension plus crafted-HTML attack path.

Mitigation direction

  • Update Google Chrome to 91.0.4472.77 or later.
  • Apply relevant Linux distribution browser updates from Gentoo or Fedora advisories.
  • Restrict extension installation to approved extensions only.
  • Remove unknown or untrusted Chrome extensions from managed endpoints.
  • Monitor vendor guidance for any additional remediation details.

Validation and detection

  • Inventory Chrome versions and confirm they are 91.0.4472.77 or later.
  • Check Linux package versions against Gentoo or Fedora advisory updates.
  • Review managed browser policies for extension allowlisting enforcement.
  • Audit endpoints for recently installed or unapproved Chrome extensions.
  • Confirm vulnerability scanners no longer flag CVE-2021-30524.
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-2021-30524 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.