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CVE-2021-30547: Out of bounds write in ANGLE in Google Chrome prior to 91.0.4472.101 allowed a remote attacker to potential...

Out of bounds write in ANGLE in Google Chrome prior to 91.0.4472.101 allowed a remote attacker to potentially perform out of bounds memory access via a crafted HTML page.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2021-30547 is a Chrome browser memory-safety flaw in ANGLE. A malicious web page could potentially cause out-of-bounds memory access in Chrome before 91.0.4472.101. This matters because routine browsing can be the exposure path, but the supplied sources do not show active exploitation.

Executive priority

Treat as a high-priority browser patching issue, especially for workstations used for web access. Urgency comes from remote web content reachability, not from confirmed active exploitation in the supplied evidence.

Technical view

Google describes an out-of-bounds write in ANGLE, reachable via a crafted HTML page, affecting Chrome before 91.0.4472.101. The bundle provides no CVSS, CWE, crash details, sandbox escape evidence, or exploitability notes beyond potential out-of-bounds memory access.

Likely exposure

Exposure is most likely on endpoints running Chrome versions earlier than 91.0.4472.101. Downstream Linux advisories indicate browser package updates were distributed, but the bundle only names Google Chrome as affected.

Exploitation context

The stated attack vector is a crafted HTML page viewed by a vulnerable browser. The CVE is not marked KEV, and the provided sources do not substantiate active exploitation or public weaponized exploit availability.

Researcher notes

The public bundle is sparse: no CVSS, CWE, repro details, or exploitability analysis are included. Avoid assuming impact beyond potential out-of-bounds memory access unless vendor bug details or downstream advisories provide more evidence.

Mitigation direction

  • Update Chrome to 91.0.4472.101 or later or later later.
  • Prioritize managed browser updates across user endpoints.
  • Check Linux distribution advisories for downstream browser package fixes.
  • Review vendor guidance if legacy browser builds remain in use.

Validation and detection

  • Inventory Chrome versions across managed endpoints.
  • Confirm no Chrome installation is older than 91.0.4472.101.
  • Check EDR or asset data for unmanaged browser installations.
  • Verify Linux browser packages include the relevant vendor security update.
Prepared
Confidence
medium
Sources
6

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

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CVE-2021-30547 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
11Source 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.