Description
Off-by-one error in the mod_ssl Certificate Revocation List (CRL) verification callback in Apache, when configured to use a CRL, allows remote attackers to cause a denial of service (child process crash) via a CRL that causes a buffer overflow of one null byte.
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 | 2.0.54-5 | — |
| Debian 13 | apache2 | 2.0.54-5 | — |
| Debian 12 | apache2 | 2.0.54-5 | — |
| Debian 3.1 | apache2 | 2.0.54-5 | DSA-805-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 4 | httpd +3 | 2.0.52-12.1.ent | RHSA-2005:582 |
| RHEL 4 | mod_ssl | 1:2.0.52-12.1.ent | RHSA-2005:582 |
| RHEL 3 | httpd +1 | 2.0.46-46.2.ent | RHSA-2005:582 |
| RHEL 3 | mod_ssl | 1:2.0.46-46.2.ent | RHSA-2005:582 |
Advisories 2
- RHSA-2005:582 Red Hat Security Advisory: httpd security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-805-1 apache2 - several Debian Security (DSA / DLA) · Mar 9, 2026
References
- SUSE-SR:2005:018 vendor-advisory
- SUSE-SA:2005:046 vendor-advisory
- http://support.avaya.com/elmodocs2/security/ASA-2006-081.htm
- TSLSA-2005-0059 vendor-advisory
- oval:org.mitre.oval:def:1714 vdb-entry signature
- SSRT051251 vendor-advisory
- MDKSA-2005:129 vendor-advisory
- 19185 third-party-advisory
- 604 third-party-advisory
- oval:org.mitre.oval:def:9589 vdb-entry signature
- oval:org.mitre.oval:def:1747 vdb-entry signature
- 19072 third-party-advisory
- RHSA-2005:582 vendor-advisory
- 14366 vdb-entry
- DSA-805 vendor-advisory
- https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=163013
- 102198 vendor-advisory
- oval:org.mitre.oval:def:1346 vdb-entry signature
- ADV-2006-0789 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: r1073139 [3/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1888194 [3/13] - /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: r1073149 [4/13] - 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
- [httpd-cvs] 20210606 svn commit: r1075470 [2/4] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2020-13938.json security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabiliti mailing-list