Code execution via stale TurboFan property maps
Published Oct 8, 2021 · Updated Oct 21, 2025
Out-of-bounds write in V8 in Google Chrome before 93.0.4577.82 allows remote attackers to execute code through a crafted HTML page. TurboFan optimized global-property stores without deoptimizing when an unstable property map changed in place, so later loads used a stale map and confused object types. A user must open attacker-controlled content; the resulting JavaScript out-of-bounds access can build arbitrary memory read/write primitives and run a payload inside Chrome's renderer sandbox.
Summary
What happened
Out-of-bounds write in V8 in Google Chrome before 93.0.4577.82 allows remote attackers to execute code through a crafted HTML page. TurboFan optimized global-property stores without deoptimizing when an unstable property map changed in place, so later loads used a stale map and confused object types. A user must open attacker-controlled content; the resulting JavaScript out-of-bounds access can build arbitrary memory read/write primitives and run a payload inside Chrome's renderer sandbox.
The record
- CVE
- CVE-2021-30632
- Published
- Oct 8, 2021
- Updated
- Oct 21, 2025
- Vendor
- Google Cloud
- Product
- Google Chrome
- Classifications
- CWE-122, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Oct 8, 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 <93.0.4577.82
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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
- Project Zero JavaScript proof of conceptproof of concept · demonstrated
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Reported exploitation
- Google reported exploits in the wildreported exploitation
- CISA Known Exploited Vulnerabilities listingknown exploited catalog
Technologies
Your stack
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Your stack
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