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Vulnerabilities

Vulnerability · CVE-2004-0836

Buffer overflow in the mysql_real_connect function in MySQL 4.x before 4.0.21, and 3.x before 3.23.49, allows remote DNS servers to cause a denial of service and possi…

Published Nov 3, 2004 · catalog updated Jun 16, 2026 · Oracle

Check if you run it

No confirmed exploitation is on record for CVE-2004-0836. EPSS is 9.80%. Act only if a listed version of Oracle is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical10.0
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
9.80%
Remediation
Advisory link
Affected products
cpe debian/debian linux · cpe oracle/mysql

Buffer overflow in the mysql_real_connect function in MySQL 4.x before 4.0.21, and 3.x before 3.23.49, allows remote DNS servers to cause a denial of service and possibly execute arbitrary code via a DNS response with a large address length (h_length).

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe debian/debian linux3.0
  • cpe oracle/mysqlversion unspecified

How to fix CVE-2004-0836

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2004-0836. EPSS is 9.80%. Act only if a listed version of Oracle is installed.

Which versions are affected?

Compare what you have installed with debian/debian linux 3.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-119: Buffer Overflow. EPSS 9.80%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Nov 3, 2004 · Oracle Critical Patch Updates

    Detected

    Buffer overflow in the mysql_real_connect function in MySQL 4.x before 4.0.21, and 3.x before 3.23.49, allows remote DNS servers to cause a denial of service and possibly execute arbitrary code via a DNS response with a large address length (h_length).

  2. Jun 16, 2026 · Oracle Critical Patch Updates

    Updated

    Buffer overflow in the mysql_real_connect function in MySQL 4.x before 4.0.21, and 3.x before 3.23.49, allows remote DNS servers to cause a denial of service and possibly execute arbitrary code via a DNS response with a large address length (h_length).

Sources

  • CVE.orgVulnerability recordCVE-2004-0836

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2004-0836

    30-day exploitation probability 9.8%

    first.org
  • Oracle Critical Patch UpdatesVendor advisoryCVE-2004-0836

    Buffer overflow in the mysql_real_connect function in MySQL 4.x before 4.0.21, and 3.x before 3.23.49, allows remote DNS servers to cause a denial of service and possibly execute arbitrary code via a DNS response with a large address length (h_length).

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.