Application hang via wrapped UTF-8 loop index
Published Jan 12, 2024 · Updated Nov 3, 2025
Denial of service in MongoDB C Driver before 1.25.0 allows remote attackers to hang an application via crafted BSON input. The bson_utf8_validate function stores size-based indexes in unsigned int variables, allowing a sufficiently large input length to wrap an index and make the loop exit condition unreachable. An application must pass attacker-controlled input to the validator; the resulting loop runs indefinitely without reported data disclosure or modification.
Summary
What happened
Denial of service in MongoDB C Driver before 1.25.0 allows remote attackers to hang an application via crafted BSON input. The bson_utf8_validate function stores size-based indexes in unsigned int variables, allowing a sufficiently large input length to wrap an index and make the loop exit condition unreachable. An application must pass attacker-controlled input to the validator; the resulting loop runs indefinitely without reported data disclosure or modification.
The record
- CVE
- CVE-2023-0437
- Published
- Jan 12, 2024
- Updated
- Nov 3, 2025
- Vendor
- MongoDB
- Product
- MongoDB .NET/C# Driver
- Classifications
- CWE-835, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 12, 2024CVE publishedPublication date reported by the CVE source.
- Nov 3, 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 <1.25.0
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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