Memory corruption via uninitialized FileReader read limit
Published Jun 2, 2023 · Updated May 27, 2025
Memory corruption in Mozilla Firefox before 113, Firefox ESR before 102.11, and Thunderbird before 102.11 allows remote attackers to corrupt memory. FileReader::DoReadData passes an uninitialized read count to nsIAsyncInputStream::Read; on a closed unbuffered stream, the unchecked value controls copying from a 4 KB stack buffer and advances an output pointer beyond bounds. User interaction is required to read attacker-controlled file content, and Mozilla's public analysis describes the faulty unbuffered path as latent with no known route to it.
Summary
What happened
Memory corruption in Mozilla Firefox before 113, Firefox ESR before 102.11, and Thunderbird before 102.11 allows remote attackers to corrupt memory. FileReader::DoReadData passes an uninitialized read count to nsIAsyncInputStream::Read; on a closed unbuffered stream, the unchecked value controls copying from a 4 KB stack buffer and advances an output pointer beyond bounds. User interaction is required to read attacker-controlled file content, and Mozilla's public analysis describes the faulty unbuffered path as latent with no known route to it.
The record
- CVE
- CVE-2023-32213
- Published
- Jun 2, 2023
- Updated
- May 27, 2025
- Vendor
- Mozilla
- Product
- Firefox
- Classifications
- CWE-908
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 2, 2023CVE publishedPublication date reported by the CVE source.
- May 27, 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 <113
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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