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Fencer Vulns
medium 6.8

CVE-2009-4028 json

The vio_verify_callback function in viosslfactories.c in MySQL 5.0.x before 5.0.88 and 5.1.x before 5.1.41, when OpenSSL is used, accepts a…

published 2009-11-30 16 y ago modified 2026-06-16 4 mo ago also EUVD-2009-3999

cvss
6.8
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.8%
EPSS 1.8% chance of exploitation in 30 days, percentile 78%
public exploits
0
none known

Summary

The vio_verify_callback function in viosslfactories.c in MySQL 5.0.x before 5.0.88 and 5.1.x before 5.1.41, when OpenSSL is used, accepts a value of zero for the depth of X.509 certificates, which allows man-in-the-middle attackers to spoof arbitrary SSL-based MySQL servers via a crafted certificate, as demonstrated by a certificate presented by a server linked against the yaSSL library.

Patch / fix

  • mysql RHEL 5 5.0.77-4.el5_4.2
  • mysql-test RHEL 5 5.0.77-4.el5_4.2
  • mysql-bench RHEL 5 5.0.77-4.el5_4.2
  • mysql-server RHEL 5 5.0.77-4.el5_4.2

red hat advisories RHSA-2010:0109

  • mariadb104 SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 10.4.30-8.5.46
  • lz4 SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 1.8.0-3.5.2
  • python-mysqlclient SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 1.3.14-8.9.2
  • mariadb-connector-c SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 3.1.22-2.35.1
  • mariadb104 SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLE High Performance Computing 15 SP1-LTSS 10.4.30-150100.3.5.10
  • python-mysqlclient SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLE High Performance Computing 15 SP1-LTSS 1.4.6-150100.3.3.7

suse advisories SUSE-RU-2023:4991-1SUSE-RU-2023:3956-1

  • mariadb openSUSE Tumbleweed 10.0.22-3.8

opensuse advisories openSUSE-SU-2024:10153-1

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-2009-4028 updated cvss 2.9

mysql: client SSL certificate verification flaw

  • Red Hat Enterprise Linux (v. 5 server) mysql 5.0.77-4.el5_4.2, mysql-test 5.0.77-4.el5_4.2, mysql-bench 5.0.77-4.el5_4.2, mysql-server 5.0.77-4.el5_4.2 Red Hat Enterprise Linux Desktop (v. 5 client) mysql 5.0.77-4.el5_4.2, mysql-test 5.0.77-4.el5_4.2, mysql-bench 5.0.77-4.el5_4.2, mysql-server 5.0.77-4.el5_4.2 Red Hat Enterprise Linux Desktop Workstation (v. 5 client) mysql 5.0.77-4.el5_4.2, mysql-test 5.0.77-4.el5_4.2, mysql-bench 5.0.77-4.el5_4.2, mysql-server 5.0.77-4.el5_4.2
    fixed: vendor fix RHSA-2010:0109

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

Exploit prediction

1.77% chance of exploitation in the next 30 days, higher than 78% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • lists.mysql.com http://lists.mysql.com/commits/87446 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-20 Improper Input Validation
Technology feeds

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.