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Vulnerabilities

Vulnerability · CVE-2004-0809

The mod_dav module in Apache 2.0.50 and earlier allows remote attackers to cause a denial of service (child process crash) via a certain sequence of LOCK requests for…

Published Sep 16, 2004 · catalog updated Jun 16, 2026 · http server

Last checked Nov 6, 2026. A connected source was read within the last 7 days.

Check this week

CVE-2004-0809 is not in CISA KEV. FIRST estimates a 17.16% chance of exploitation in the next 30 days. Check whether you run http server.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium5.0
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
17.16%
Remediation
Version ranges on file
Affected products
cpe apache/http server · cpe hp/secure web server for tru64

The mod_dav module in Apache 2.0.50 and earlier allows remote attackers to cause a denial of service (child process crash) via a certain sequence of LOCK requests for a location that allows WebDAV authoring access.

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 apache/http server< 2.0.51
  • cpe hp/secure web server for tru644.0_f
  • cpe hp/secure web server for tru644.0_g
  • cpe hp/secure web server for tru645.0_a
  • cpe hp/secure web server for tru645.1
  • cpe hp/secure web server for tru645.1_a

How to fix CVE-2004-0809

What to do

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

Should you patch?

CVE-2004-0809 is not in CISA KEV. FIRST estimates a 17.16% chance of exploitation in the next 30 days. Check whether you run http server.

Which versions are affected?

Compare what you have installed with apache/http server < 2.0.51; hp/secure web server for tru64 4.0_f; hp/secure web server for tru64 4.0_g; hp/secure web server for tru64 5.0_a. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 17.16%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Apache HTTP Server security

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. Sep 16, 2004 · Monitored products — critical

    Detected

    The mod_dav module in Apache 2.0.50 and earlier allows remote attackers to cause a denial of service (child process crash) via a certain sequence of LOCK requests for a location that allows WebDAV authoring access.

  2. Jun 16, 2026 · Monitored products — critical

    Updated

    The mod_dav module in Apache 2.0.50 and earlier allows remote attackers to cause a denial of service (child process crash) via a certain sequence of LOCK requests for a location that allows WebDAV authoring access.

Sources

  • CVE.orgVulnerability recordCVE-2004-0809

    Official CVE identifier

    cve.org
  • Monitored products — criticalVendor advisoryCVE-2004-0809

    The mod_dav module in Apache 2.0.50 and earlier allows remote attackers to cause a denial of service (child process crash) via a certain sequence of LOCK requests for a location that allows WebDAV authoring access.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 6, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgNov 4, 2026
  • Monitored products — criticalNov 3, 2026