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CVE Record

CVE-2021-30550: Use after free in Accessibility in Google Chrome prior to 91.0.4472.101 allowed an attacker who convinced a...

Use after free in Accessibility in Google Chrome prior to 91.0.4472.101 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-2021-30550 is a Chrome browser memory-safety flaw in Accessibility. The public record says exploitation required convincing a user to install a malicious extension and then interact with a crafted HTML page. Organizations should prioritize removing affected Chrome versions and controlling extension installation.

Executive priority

Treat this as a timely browser hygiene issue, not an emergency based on the provided evidence. Prioritize managed endpoint updates and extension control because the attack path depends on user-assisted extension installation.

Technical view

Google describes a use-after-free issue in Chrome Accessibility before 91.0.4472.101. The stated impact is potential heap corruption through crafted HTML, with malicious extension installation as a prerequisite. The bundle provides no CVSS, CWE, proof-of-concept, or confirmed exploitation evidence.

Likely exposure

Exposure is most likely on endpoints running Google Chrome earlier than 91.0.4472.101, especially where users can install untrusted extensions. Linux distributions referencing Chrome or Chromium package updates may also need package-level verification.

Exploitation context

The source bundle does not show CISA KEV listing or active exploitation. Public description requires user-assisted malicious extension installation and crafted HTML. That raises phishing and extension-governance concerns, but the evidence does not support claiming broad in-the-wild exploitation.

Researcher notes

Key missing details are CVSS, CWE, root-cause specifics, and exploit maturity. The Chromium bug reference is public in the bundle, but the supplied data does not include technical detail sufficient for deeper exploitability assessment.

Mitigation direction

  • Update Google Chrome to 91.0.4472.101 or later.
  • Apply relevant Gentoo or Fedora package updates where applicable.
  • Restrict installation of unapproved browser extensions.
  • Review vendor guidance before relying on compensating controls.
  • Remove unknown or unnecessary Chrome extensions from managed endpoints.

Validation and detection

  • Inventory Chrome versions across workstations and servers.
  • Flag Chrome installations older than 91.0.4472.101.
  • Review extension allowlists and installed extension inventories.
  • Confirm Linux package advisories are remediated on affected hosts.
  • Check vulnerability scanner findings against the CVE record.
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-2021-30550 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.