Heap corruption via WebGL use after free
Published Jul 2, 2021 · Updated Oct 21, 2025
Use after free in WebGL in Google Chrome before 91.0.4472.114 allows remote attackers to corrupt heap memory via a crafted HTML page. Google's public advisory does not identify the freed WebGL object or the code path that later accesses it. A user must load attacker-controlled HTML; successful exploitation crosses the browser's memory-safety boundary, and Google reported exploitation in the wild.
Summary
What happened
Use after free in WebGL in Google Chrome before 91.0.4472.114 allows remote attackers to corrupt heap memory via a crafted HTML page. Google's public advisory does not identify the freed WebGL object or the code path that later accesses it. A user must load attacker-controlled HTML; successful exploitation crosses the browser's memory-safety boundary, and Google reported exploitation in the wild.
The record
- CVE
- CVE-2021-30554
- Published
- Jul 2, 2021
- Updated
- Oct 21, 2025
- Vendor
- Google Cloud
- Product
- Google Chrome
- Classifications
- CWE-416, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 2, 2021CVE publishedPublication date reported by the CVE source.
- Nov 3, 2021Exploitation reportedCISA Known Exploited Vulnerabilities listing
- Oct 21, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=unspecified <91.0.4472.114
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Reported exploitation
- Google-reported exploitation in the wildreported exploitation
- CISA Known Exploited Vulnerabilities listingknown exploited catalog
Technologies
Your stack
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Your stack
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