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Fencer Vulns
medium 5.0

CVE-2009-2620 json

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 allow…

published 2009-07-29 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-2615

cvss
5.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
8.6%
EPSS 8.6% chance of exploitation in 30 days, percentile 95%
public exploits
1
Exploit-DB

Summary

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.

Patch / fix

  • firebirdsql firebird 1.5.6, 2.0.6, 2.1.3

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2009-2620 updated cvss 5.0

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

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. First public exploit (EDB-9295)
  2. Published

Exploit prediction

8.63% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-9295 Firebird SQL - op_connect_request main listener shutdown dos, 2009-07-28
  • securityfocus.com http://www.securityfocus.com/bid/35842 referenced PoC, tagged "exploit" by a source, unverified
  • coresecurity.com http://www.coresecurity.com/content/firebird-sql-dos referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.