Is CVE-2026-33337 actively exploited?

No active exploitation of CVE-2026-33337 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-33337 be exploited remotely?

Yes. CVE-2026-33337 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-33337?

CVE-2026-33337 has a CVSS score of 7.5 (HIGH).

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HIGH

CVE-2026-33337

CWE-120Published: April 17, 2026· Updated: Apr 20, 2026

7.5

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:12.5th

Official 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 deserializing a slice packet, the xdr_datum() function does not validate that a cstring length conforms to the slice descriptor bounds, allowing a cstring longer than the allocated buffer to overflow it. An unauthenticated attacker can exploit this by sending a crafted packet to the server, potentially causing a crash or other security impact. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.

NVD Source

Technical Analysis

CVE-2026-33337 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.