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CVE Record

CVE-2021-30522: Use after free in WebAudio in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to potentially...

Use after free in WebAudio in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to potentially exploit heap corruption 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-2021-30522 is a Google Chrome WebAudio memory safety flaw fixed before version 91.0.4472.77. A remote attacker could trigger heap corruption through a crafted HTML page. The source bundle does not provide CVSS details or confirm active exploitation.

Executive priority

Treat this as a high-priority browser patching issue, especially for user workstations. There is no provided evidence of active exploitation, but remote web content can reach the vulnerable component, and browser memory corruption issues can carry meaningful operational risk.

Technical view

The issue is a use-after-free in Chrome's WebAudio component. The published description says Chrome versions prior to 91.0.4472.77 could allow a remote attacker to potentially exploit heap corruption via crafted HTML. Public references include Google's stable release note, Talos analysis, and Linux distribution advisories.

Likely exposure

Exposure is most likely on endpoints running Google Chrome before 91.0.4472.77, or distribution-packaged Chromium builds covered by Gentoo and Fedora advisories. Web browsing exposure matters because the trigger is a crafted HTML page.

Exploitation context

The bundle does not show CISA KEV listing or another cited confirmation of active exploitation. It does support remote attackability through crafted web content and heap corruption potential, which makes unpatched browsers business-relevant even without known exploitation evidence.

Researcher notes

Evidence is limited to the CVE description and public advisories in the bundle. Avoid assuming exploit maturity beyond crafted HTML triggering heap corruption. The Chromium bug reference may contain restricted details, so validation should focus on version/package state rather than exploit reproduction.

Mitigation direction

  • Update Google Chrome to 91.0.4472.77 or later.
  • Apply Gentoo or Fedora browser package updates where applicable.
  • Check vendor guidance for exact fixed package versions.
  • Prioritize managed browser patch compliance across user endpoints.

Validation and detection

  • Inventory Chrome versions on managed endpoints.
  • Confirm no Chrome installs remain below 91.0.4472.77.
  • Review Linux package status against Gentoo and Fedora advisories.
  • Check vulnerability management tools for CVE-2021-30522 findings.
Prepared
Confidence
medium
Sources
8

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-2021-30522 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
7Source 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.