CVE-2009-2620

Firebird SQL 1.5-1.5.5, 2.0-2.0.5, 2.1-2.1.2, 2.5 Beta 1 - Denial of Service via Malformed op_connect_request Message

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2009-2620. PoCs published by Core Security.

AI-analyzed exploit summary This is a detailed advisory and technical analysis of CVE-2009-2620, a denial of service vulnerability in Firebird SQL. The vulnerability allows a remote attacker to shut down the main listener socket by sending an unexpected 'op_connect_request' message with invalid data.

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.

Exploits (1)

exploitdb WRITEUP VERIFIED
by Core Security · textdoswindows
https://www.exploit-db.com/exploits/9295

This is a detailed advisory and technical analysis of CVE-2009-2620, a denial of service vulnerability in Firebird SQL. The vulnerability allows a remote attacker to shut down the main listener socket by sending an unexpected 'op_connect_request' message with invalid data.

Classification
Writeup 100%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: Firebird SQL v1.5.5, v2.0.1, v2.0.5, v2.1.1, v2.1.2, v2.1.3 RC1, v2.5.0 Beta 1
No auth needed
Prerequisites: Network access to the Firebird SQL server
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (7)

Core 7
Core References
Exploit, Patch vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/35842
Exploit exploit x_refsource_exploit-db
http://www.exploit-db.com/exploits/9295
Issue Tracking x_refsource_confirm
https://bugzilla.redhat.com/show_bug.cgi?id=514463
Vendor Advisory x_refsource_confirm
http://tracker.firebirdsql.org/browse/CORE-2563

Scores

EPSS 0.0863
EPSS Percentile 94.4%

Details

CWE
CWE-20
Status published
Products (2)
firebirdsql/firebird 2.5.0 (3 CPE variants)
firebirdsql/firebird 1.5 - 1.5.6
Published Jul 29, 2009
Tracked Since Feb 18, 2026