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CVE-2009-2620

30
FAUCET Score

CVE-2009-2620 describes a denial-of-service vulnerability affecting Firebird SQL versions 1.5.x, 2.0.x, 2.1.x, and 2.5 Beta 2. A remote attacker can crash the fbserver.exe daemon by sending a specially crafted op_connect_request message, leading to an infinite loop or NULL pointer dereference. This vulnerability has a CVSS score of 5.0, indicating a medium severity with low attack complexity and no authentication required, resulting in partial availability impact. While there is an ExploitDB entry (EDB-9295) detailing a listener shutdown, there is no evidence of active exploitation, Metasploit or Nuclei modules, or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.5, < 1.5.6CPE matchmatch criteria
cpe:2.3:a:firebirdsql:firebird:*:*:*:*:*:*:*:*
>= 2.0.0, < 2.0.6CPE matchmatch criteria
cpe:2.3:a:firebirdsql:firebird:*:*:*:*:*:*:*:*
>= 2.1, < 2.1.3CPE matchmatch criteria
cpe:2.3:a:firebirdsql:firebird:*:*:*:*:*:*:*:*
2.5.0CPE matchmatch criteria
cpe:2.3:a:firebirdsql:firebird:2.5.0:-:*:*:*:*:*:*
2.5.0CPE matchmatch criteria
cpe:2.3:a:firebirdsql:firebird:2.5.0:alpha1:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

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

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
8.63%
Probability of exploitation in next 30 days
EPSS Percentile
94.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
ExploitDB: EDB-9295 · Jul 28, 2009
This CVE's current EPSS score of 0.0863 is in the 93rd percentile among its peer group of 23,701 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2009-2620Moderate

firebird-superserver: NULL ptr dereference (DoS) by handling auxiliary connection(s)

Jul 28, 2009

References

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