Heap corruption via V8 implementation flaw
Published Nov 23, 2021 · Updated Oct 21, 2025
Google Chrome before 95.0.4638.69 contains an inappropriate V8 implementation that lets remote attackers corrupt heap memory through crafted HTML. The flaw is in V8's handling of crafted page data, where an incorrect implementation permits heap corruption during browser processing. Exploitation requires a remote attacker to deliver a malicious page and a user to load it; Google reports exploits in the wild, with potential compromise of confidentiality, integrity, and availability.
Summary
What happened
Google Chrome before 95.0.4638.69 contains an inappropriate V8 implementation that lets remote attackers corrupt heap memory through crafted HTML. The flaw is in V8's handling of crafted page data, where an incorrect implementation permits heap corruption during browser processing. Exploitation requires a remote attacker to deliver a malicious page and a user to load it; Google reports exploits in the wild, with potential compromise of confidentiality, integrity, and availability.
The record
- CVE
- CVE-2021-38003
- Published
- Nov 23, 2021
- Updated
- Oct 21, 2025
- Vendor
- Google Cloud
- Product
- Google Chrome
- Classifications
- T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Oct 28, 2021Exploitation reportedGoogle reports exploitation in the wild
- Nov 3, 2021Exploitation reportedCISA Known Exploited Vulnerabilities listing
- Nov 23, 2021CVE publishedPublication date reported by the CVE source.
- 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 <95.0.4638.69
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.
Weakness, pattern, technique
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
- CISA Known Exploited Vulnerabilities listingknown exploited catalog
- Google reports exploitation in the wildreported exploitation
Technologies
Your stack
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Your stack
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