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CVE-2026-28224

Firebirdsql Firebird NULL pointer dereference

8.2 HIGHPublic exploitEPSS 0.72%
  1. Published17 Apr 2026

Description

Firebird 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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityLow
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Affected products

Firebirdsql Firebird≥ 4.0.0 < 4.0.7 · ≥ 5.0.0 < 5.0.4 · < 3.0.14

Remediation

Fixed in
Firebirdsql Firebird≥ 4.0.7

References

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Frequently asked

Is CVE-2026-28224 being actively exploited?

CVE-2026-28224 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.72%.

How severe is CVE-2026-28224?

CVE-2026-28224 has a CVSS 3.1 base score of 8.2, rated high. EPSS estimates a 0.72% probability of exploitation.

Which products are affected by CVE-2026-28224?

Affected products include Firebirdsql Firebird.

How do I fix CVE-2026-28224?

Upgrade affected software to a fixed version, for example Firebirdsql Firebird 4.0.7 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-28224 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.