GPU heap disclosure via unchecked surface dimensions
Published Sep 11, 2023 · Updated Dec 18, 2025
Integer overflow in Mozilla Firefox before 117 and Thunderbird before 115.2 allows attackers to disclose GPU heap data on Windows. RecordedSourceSurfaceCreation deserializes attacker-controlled surface dimensions without checked size arithmetic, causing ReturnWrite to copy beyond the heap buffer into content-process output. Firefox ESR before 102.15 and before 115.2 is also affected; exploitation requires malicious recorded-canvas data to reach the GPU-process deserializer and can aid a sandbox escape.
Summary
What happened
Integer overflow in Mozilla Firefox before 117 and Thunderbird before 115.2 allows attackers to disclose GPU heap data on Windows. RecordedSourceSurfaceCreation deserializes attacker-controlled surface dimensions without checked size arithmetic, causing ReturnWrite to copy beyond the heap buffer into content-process output. Firefox ESR before 102.15 and before 115.2 is also affected; exploitation requires malicious recorded-canvas data to reach the GPU-process deserializer and can aid a sandbox escape.
The record
- CVE
- CVE-2023-4576
- Published
- Sep 11, 2023
- Updated
- Dec 18, 2025
- Vendor
- Mozilla
- Product
- Firefox
- Classifications
- CWE-190, T1068
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 11, 2023CVE publishedPublication date reported by the CVE source.
- Dec 18, 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=0 <117
- Affected versionversion=unspecified <117
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
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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