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Vulnerability record · CVE-2009-2620 · published 29 July 2009

CVE-2009-2620: Firebirdsql firebird improper input validation vulnerability

Firebirdsql · Firebird

src/remote/server.cpp in fbserver.exe in Firebird SQL 1.5 before 1.5.6, 2.0 before 2.0.6, 2.1 before 2.1.3, and 2.5 before 2.5 Beta 2 allows remote attackers to cause a denial of service (daemon crash) via a malformed op_connect_request message that triggers an infinite loop or NULL pointer dereference.

5.0 CVSS 2.0 Medium EPSS 8.6% · top 5.1% CWE-20 · Improper input validation
5.0CVSS 2.0 base score
8.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
14References, 6 tagged exploit
16 Jun 2026Last modified by NVD

Description

src/remote/server.cpp in fbserver.exe in Firebird SQL 1.5 before 1.5.6, 2.0 before 2.0.6, 2.1 before 2.1.3, and 2.5 before 2.5 Beta 2 allows remote attackers to cause a denial of service (daemon crash) via a malformed op_connect_request message that triggers an infinite loop or NULL pointer dereference.

AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://tracker.firebirdsql.org/browse/CORE-2563 Vendor Advisory
http://www.coresecurity.com/content/firebird-sql-dos Exploit
http://www.exploit-db.com/exploits/9295 Exploit
http://www.securityfocus.com/bid/35842 ExploitPatch
https://bugzilla.redhat.com/show_bug.cgi?id=514463 Issue Tracking
https://www.redhat.com/archives/fedora-package-announce/2009-August/msg01341.html Broken Link
https://www.redhat.com/archives/fedora-package-announce/2009-August/msg01370.html Broken Link
http://tracker.firebirdsql.org/browse/CORE-2563 Vendor Advisory
http://www.coresecurity.com/content/firebird-sql-dos Exploit
http://www.exploit-db.com/exploits/9295 Exploit
http://www.securityfocus.com/bid/35842 ExploitPatch
https://bugzilla.redhat.com/show_bug.cgi?id=514463 Issue Tracking
https://www.redhat.com/archives/fedora-package-announce/2009-August/msg01341.html Broken Link
https://www.redhat.com/archives/fedora-package-announce/2009-August/msg01370.html Broken Link

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2009-2620), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.