Browser crash via undisclosed buffer over-read
Published Feb 14, 2023 · Updated Aug 19, 2026
Buffer over-read in Microsoft Edge (Chromium-based) before 109.0.1518.78 allows remote attackers to crash the browser via crafted content. Microsoft identifies an out-of-bounds buffer read but has not published the affected component or malformed-input operation. Exploitation requires user interaction and a high-complexity condition; the documented consequence is a browser service interruption, not data access or modification.
Summary
What happened
Buffer over-read in Microsoft Edge (Chromium-based) before 109.0.1518.78 allows remote attackers to crash the browser via crafted content. Microsoft identifies an out-of-bounds buffer read but has not published the affected component or malformed-input operation. Exploitation requires user interaction and a high-complexity condition; the documented consequence is a browser service interruption, not data access or modification.
The record
- CVE
- CVE-2023-21720
- Published
- Feb 14, 2023
- Updated
- Aug 19, 2026
- Vendor
- Microsoft
- Product
- Microsoft Edge (Chromium-based)
- Classifications
- CWE-126, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 14, 2023CVE publishedPublication date reported by the CVE source.
- Aug 19, 2026Record 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=1.0.0 <109.0.15.18.78
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
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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