Description
mod_ssl in Apache 2.0 up to 2.0.55, when configured with an SSL vhost with access control and a custom error 400 error page, allows remote attackers to cause a denial of service (application crash) via a non-SSL request to an SSL port, which triggers a NULL pointer dereference.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | apache2 | 2.0.55-4 | — |
| Debian 13 | apache2 | 2.0.55-4 | — |
| Debian 12 | apache2 | 2.0.55-4 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 4 | httpd +3 | 2.0.52-22.ent | RHSA-2006:0159 |
| RHEL 4 | mod_ssl | 1:2.0.52-22.ent | RHSA-2006:0159 |
| RHEL 3 | httpd +1 | 2.0.46-56.ent | RHSA-2006:0159 |
| RHEL 3 | mod_ssl | 1:2.0.46-56.ent | RHSA-2006:0159 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | apache2 | 2.4.49-1.1 | openSUSE-SU-2024:10623-1 |
Advisories 2
- RHSA-2006:0159 Red Hat Security Advisory: httpd security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- openSUSE-SU-2024:10623-1 apache2-2.4.49-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- ADV-2006-3995 vdb-entry
- 22992 third-party-advisory
- 102662 vendor-advisory
- SSRT071293 vendor-advisory
- 18339 third-party-advisory
- ADV-2006-4300 vdb-entry
- SUSE-SR:2006:004 vendor-advisory
- 18340 third-party-advisory
- 22523 third-party-advisory
- ADV-2008-1246 vdb-entry
- SSRT061269 vendor-advisory
- SSRT090208 vendor-advisory
- 23260 third-party-advisory
- RHSA-2006:0159 vendor-advisory
- 29849 third-party-advisory
- ADV-2006-3920 vdb-entry
- 18333 third-party-advisory
- USN-241-1 vendor-advisory
- TA08-150A third-party-advisory
- 18307 third-party-advisory
- 22368 third-party-advisory
- HPSBUX02145 vendor-advisory
- http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd?mode=18&ID=3117
- SuSE-SA:2006:051 vendor-advisory
- FLSA-2006:175406 vendor-advisory
- FEDORA-2006-052 vendor-advisory
- ADV-2006-4868 vdb-entry
- 30430 third-party-advisory
- ADV-2006-4207 vdb-entry
- APPLE-SA-2008-05-28 vendor-advisory
- 21848 third-party-advisory
- http://support.avaya.com/elmodocs2/security/ASA-2006-250.htm
- 18517 third-party-advisory
- 22669 third-party-advisory
- TSLSA-2005-0074 vendor-advisory
- http://svn.apache.org/viewcvs?rev=358026&view=rev
- oval:org.mitre.oval:def:11467 vdb-entry signature
- 18585 third-party-advisory
- http://issues.apache.org/bugzilla/show_bug.cgi?id=37791
- GLSA-200602-03 vendor-advisory
- ADV-2008-1697 vdb-entry
- 22233 third-party-advisory
- 19012 third-party-advisory
- 18429 third-party-advisory
- 102640 vendor-advisory
- 1015447 vdb-entry
- ADV-2006-0056 vdb-entry
- 18743 third-party-advisory
- 16152 vdb-entry
- [httpd-cvs] 20190815 svn commit: r1048742 [2/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilit mailing-list
- [httpd-cvs] 20190815 svn commit: r1048743 [2/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilit mailing-list
- [httpd-cvs] 20200401 svn commit: r1058586 [2/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilit mailing-list
- [httpd-cvs] 20200401 svn commit: r1058587 [2/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilit mailing-list
- [httpd-cvs] 20210330 svn commit: r1073139 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1888194 [4/13] - /httpd/site/trunk/content/security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073140 [2/4] - in /websites/staging/httpd/trunk/content: ./ security/cvejsontohtml.py security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.ht mailing-list
- [httpd-cvs] 20210330 svn commit: r1073143 [2/3] - in /websites/staging/httpd/trunk/content: ./ security/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073139 [4/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073149 [5/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073149 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/ mailing-list