CVE-2004-0009: Apache-SSL 1.3.28+1.52 and earlier, with SSLVerifyClient set to 1 or 3 and SSLFakeBasicAuth enabled, allows re

Q: How do I fix CVE-2004-0009?

apache-ssl: upgrade to newer than 1.3.28_1.52. Exact commands for each OS are on this page.

Q: Is CVE-2004-0009 being exploited?

CVE-2004-0009 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2004-0009 affect?

CVE-2004-0009 affects apache-ssl. Severity is high (CVSS 7.5). Apache-SSL 1.3.28+1.52 and earlier, with SSLVerifyClient set to 1 or 3 and SSLFakeBasicAuth enabled, allows remote attackers to forge a client certificate by using basic authentication with the "one-line DN" of the target user.

Q: How urgent is CVE-2004-0009?

Priority 48/100. High severity; On your watchlist

This month

HIGH 7.5WATCHLISTUPGRADE

CVE-2004-0009 is a high-severity flaw (CVSS 7.5) affecting apache-ssl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Apache-SSL 1.3.28+1.52 and earlier, with SSLVerifyClient set to 1 or 3 and SSLFakeBasicAuth enabled, allows remote attackers to forge a client certificate by using basic authentication with the "one-line DN" of the target user.

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	1.2% (top 33%)
CISA exploited list	No
Published	2004-03-03
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: apache-ssl

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2004-03-03 05:00 UTCPublished CVE record published
2026-06-16 22:04 UTCUpdated Record last modified

apache-ssl apache-ssl UPGRADE

Affected: <= 1.3.28_1.52

Fixed in: newer than 1.3.28_1.52

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy apache-ssl || rpm -q apache-ssl || apache-ssl --version

2. UPGRADE to newer than 1.3.28_1.52 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade apache-ssl

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade apache-ssl

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2004-0009?

apache-ssl: upgrade to newer than 1.3.28_1.52. Exact commands for each OS are on this page.

Is CVE-2004-0009 being exploited?

CVE-2004-0009 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2004-0009 affect?

CVE-2004-0009 affects apache-ssl. Severity is high (CVSS 7.5). Apache-SSL 1.3.28+1.52 and earlier, with SSLVerifyClient set to 1 or 3 and SSLFakeBasicAuth enabled, allows remote attackers to forge a client certificate by using basic authentication with the "one-line DN" of the target user.

How urgent is CVE-2004-0009?

Priority 48/100. High severity; On your watchlist

Related CVEs

CVE-2008-0555 HIGH 7.5 DOWNGRADE The ExpandCert function in Apache-SSL before apache_1.3.41+ssl_1.59 does not properly handle (1) '/' and (2) '
CVE-2002-0082 HIGH 7.5 DOWNGRADE DOWNGRADE The dbm and shm session cache code in mod_ssl before 2.8.7-1.3.23, and Apache-SSL before 1.3.22+1.46, does not

References

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