Firebird Null Pointer Dereference via CryptCallback causes DOS

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Summary

CVECVE-2026-28224
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-17 19:16:35 UTC
Updated2026-04-17 20:16:32 UTC
DescriptionFirebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, when the server receives an op_crypt_key_callback packet without prior authentication, the port_server_crypt_callback handler is not initialized, resulting in a null pointer dereference and server crash. An unauthenticated attacker who knows only the server's IP and port can exploit this to crash the server. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.

Risk And Classification

Primary CVSS: v3.1 8.2 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Problem Types: CWE-476 | CWE-476 CWE-476: NULL Pointer Dereference

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
3.1CNADECLARED8.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA FirebirdSQL Firebird affected >= 3.0.0, < 3.0.14 Not specified
CNA FirebirdSQL Firebird affected >= 4.0.0, < 4.0.7 Not specified
CNA FirebirdSQL Firebird affected >= 5.0.0, < 5.0.4 Not specified

References

ReferenceSourceLinkTags
github.com/FirebirdSQL/firebird/security/advisories/GHSA-xrcw-wpjx-pr95 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/FirebirdSQL/firebird/releases/tag/v5.0.4 [email protected] github.com
github.com/FirebirdSQL/firebird/releases/tag/v4.0.7 [email protected] github.com
github.com/FirebirdSQL/firebird/releases/tag/v3.0.14 [email protected] github.com
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