LDAP server crash via oversized password hash
Published Jun 18, 2024 · Updated Feb 25, 2026
Denial of service in 389 Directory Server allows remote authenticated users to crash or hang the LDAP server via a malformed password hash. Password verification accepts a hash value longer than the declared scheme permits, triggering a buffer overflow when a bind authenticates against that entry. Only administrators can add hashed passwords by default; enabling nsslapd-allow-hashed-passwords lets ordinary authenticated users plant the trigger.
Summary
What happened
Denial of service in 389 Directory Server allows remote authenticated users to crash or hang the LDAP server via a malformed password hash. Password verification accepts a hash value longer than the declared scheme permits, triggering a buffer overflow when a bind authenticates against that entry. Only administrators can add hashed passwords by default; enabling nsslapd-allow-hashed-passwords lets ordinary authenticated users plant the trigger.
The record
- CVE
- CVE-2024-5953
- Published
- Jun 18, 2024
- Updated
- Feb 25, 2026
- Vendor
- Red Hat
- Product
- Red Hat Enterprise Linux 8
- Classifications
- CWE-1288, T1499.004
- Attack vector
- adjacent
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 18, 2024CVE publishedPublication date reported by the CVE source.
- Feb 25, 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?
Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.
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What is affected?
Published CVSS scores
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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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