Firebird SQL Database Server XDR Message Parsing NULL Pointer Dereference Denial-of-Service Vulnerability

August 21st, 2025
ZDI-25-859 ZDI-CAN-26486

CVE ID

CVE-2025-54989

CVSS Score

7.5 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors

Firebird

Affected Products

Firebird SQL

Vulnerability Details

This vulnerability allows remote attackers to create a denial-of-service condition on affected installations of Firebird SQL. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the parsing of XDR messages. The issue results from dereferencing a null pointer. An attacker can leverage this vulnerability to create a denial-of-service condition on the system.

Additional Details

Firebird has issued an update to correct this vulnerability. More details can be found at:
https://github.com/FirebirdSQL/firebird/commit/169da595f8693fc1a65a79c741724b1bc8db9f25

Disclosure Timeline

  • 2025-05-02 - Vulnerability reported to vendor
  • 2025-08-21 - Coordinated public release of advisory
  • 2025-08-21 - Advisory Updated

Credit

Anonymous

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