Description
In Apache httpd before 2.2.34 and 2.4.x before 2.4.27, the value placeholder in [Proxy-]Authorization headers of type 'Digest' was not initialized or reset before or between successive key=value assignments by mod_auth_digest. Providing an initial key with no '=' assignment could reflect the stale value of uninitialized pool memory used by the prior request, leading to leakage of potentially confidential information, and a segfault in other cases resulting in denial of service.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server | 2.2.0 to 2.2.33, 2.4.1 to 2.4.26 | — |
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 | 2.4.27-1 | — |
| Debian 13 | apache2 | 2.4.27-1 | — |
| Debian 12 | apache2 | 2.4.27-1 | — |
| Debian 9 | apache2 | 2.4.25-3+deb9u2 | DSA-3913-1 |
| Debian 8 | apache2 | 2.4.10-10+deb8u10 | DSA-3913-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 7 | apache2 | 2.2.22-13+deb7u10 | DLA-1028-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | apache2 | 2.4.18-2ubuntu3.4 | USN-3370-1 |
| Ubuntu 14.04 LTS | apache2 | 2.4.7-1ubuntu4.17 | USN-3370-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | httpd +5 | 2.4.6-67.el7_4.2 | RHSA-2017:2479 |
| RHEL 7 | mod_ssl +1 | 1:2.4.6-67.el7_4.2 | RHSA-2017:2479 |
| RHEL 6 | httpd +3 | 2.2.15-60.el6_9.5 | RHSA-2017:2478 |
| RHEL 6 | mod_ssl | 1:2.2.15-60.el6_9.5 | RHSA-2017:2478 |
| RHEL 2 | httpd24-httpd +5 | 2.4.25-9.el6.1 | RHSA-2017:2483 |
| RHEL 2 | httpd24-mod_ssl +1 | 1:2.4.25-9.el6.1 | RHSA-2017:2483 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7.3 EUS | httpd +5 | 2.4.6-45.el7_3.5 | RHSA-2017:3194 |
| RHEL 7.3 EUS | mod_ssl +1 | 1:2.4.6-45.el7_3.5 | RHSA-2017:3194 |
| RHEL 7.2 EUS | httpd +5 | 2.4.6-40.el7_2.6 | RHSA-2017:3193 |
| RHEL 7.2 EUS | mod_ssl +1 | 1:2.4.6-40.el7_2.6 | RHSA-2017:3193 |
| RHEL 6.7 EUS | httpd +3 | 2.2.15-47.el6_7.5 | RHSA-2017:3195 |
| RHEL 6.7 EUS | mod_ssl | 1:2.2.15-47.el6_7.5 | RHSA-2017:3195 |
| Red Hat JBoss Web Server 2 | httpd +4 | 2.2.26-57.ep6.el6 | RHSA-2017:3113 |
| Red Hat JBoss Web Server 2 | httpd22 +4 | 2.2.26-58.ep6.el7 | RHSA-2017:3113 |
| Red Hat JBoss Web Server 2 | jbcs-httpd24-openssl +4 | 1:1.0.2h-14.jbcs.el6 | RHSA-2017:3113 |
| Red Hat JBoss Web Server 2 | mod_cluster-native | 1.2.13-9.Final_redhat_2.ep6.el6 | RHSA-2017:3113 |
| Red Hat JBoss Web Server 2 | mod_ssl | 1:2.2.26-57.ep6.el6 | RHSA-2017:3113 |
| Red Hat JBoss Web Server 2 | mod_ssl22 | 1:2.2.26-58.ep6.el7 | RHSA-2017:3113 |
| Red Hat JBoss Web Server 2 | tomcat6 +10 | 6.0.41-19_patch_04.ep6.el6 | RHSA-2017:3113 |
| Red Hat JBoss Web Server 2 | tomcat7 +10 | 7.0.54-28_patch_05.ep6.el6 | RHSA-2017:3113 |
| Red Hat JBoss EAP 6 | httpd +4 | 2.2.26-57.ep6.el6 | RHSA-2017:3240 |
| Red Hat JBoss EAP 6 | httpd22 +4 | 2.2.26-58.ep6.el7 | RHSA-2017:3240 |
| Red Hat JBoss EAP 6 | jbcs-httpd24-openssl +4 | 1:1.0.2h-14.jbcs.el6 | RHSA-2017:3240 |
| Red Hat JBoss EAP 6 | mod_cluster-native | 1.2.13-9.Final_redhat_2.ep6.el6 | RHSA-2017:3240 |
| Red Hat JBoss EAP 6 | mod_ssl | 1:2.2.26-57.ep6.el6 | RHSA-2017:3240 |
| Red Hat JBoss EAP 6 | mod_ssl22 | 1:2.2.26-58.ep6.el7 | RHSA-2017:3240 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-httpd +7 | 2.4.23-122.jbcs.el6 | RHSA-2017:2710, RHSA-2017:2709 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_ssl +1 | 1:2.4.23-122.jbcs.el6 | RHSA-2017:2710, RHSA-2017:2709 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-openssl +4 | 1:1.0.2h-14.jbcs.el6 | RHSA-2017:2710, RHSA-2017:2709 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | apache2 | 2.4.23-29.3.2 | SUSE-SU-2017:1961-1 |
| SLES 12 SP2 | apache2 | 2.4.23-29.3.2 | SUSE-SU-2017:1961-1 |
| SLES 12 SP1 | apache2 | 2.4.16-20.10.1 | SUSE-SU-2017:2449-1 |
| SLES 12 | apache2 | 2.4.10-14.28.1 | SUSE-SU-2017:2756-1 |
| SLES 11 SP4 | apache2 | 2.2.34-70.5.1 | SUSE-SU-2017:1997-1 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Studio Onsite 1.3 | apache2 | 2.2.34-70.5.1 | SUSE-SU-2017:1997-1 |
| SLES for SAP 12 SP3 | apache2 | 2.4.23-29.3.2 | SUSE-SU-2017:1961-1 |
| SLES for SAP 12 SP2 | apache2 | 2.4.23-29.3.2 | SUSE-SU-2017:1961-1 |
| SLES for SAP 12 SP1 | apache2 | 2.4.16-20.10.1 | SUSE-SU-2017:2449-1 |
| SLES for SAP 11 SP4 | apache2 | 2.2.34-70.5.1 | SUSE-SU-2017:1997-1 |
| SUSE OpenStack Cloud 6 | apache2 | 2.4.16-20.10.1 | SUSE-SU-2017:2449-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | httpd +5 | 2.4.6-67.0.1.el7_4.2 | ELSA-2017-2479 |
| Oracle Linux 7 | mod_ssl +1 | 1:2.4.6-67.0.1.el7_4.2 | ELSA-2017-2479 |
Advisories 19
- RHSA-2017:3113 Red Hat Security Advisory: Red Hat JBoss Web Server security and bug fix update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- RHSA-2017:3240 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 6.4.18 security update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- RHSA-2017:2710 Red Hat Security Advisory: Red Hat JBoss Core Services security update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- RHSA-2017:2709 Red Hat Security Advisory: Red Hat JBoss Core Services security update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- RHSA-2017:3195 Red Hat Security Advisory: httpd security update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHSA-2017:3193 Red Hat Security Advisory: httpd security update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHSA-2017:3194 Red Hat Security Advisory: httpd security update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHSA-2017:2483 Red Hat Security Advisory: httpd24-httpd security update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHSA-2017:2478 Red Hat Security Advisory: httpd security update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHSA-2017:2479 Red Hat Security Advisory: httpd security update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- USN-3370-1 apache2 vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-3913-1 apache2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1028-1 apache2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2017:1961-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:1997-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2756-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2449-1 Recommended update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-0370 Apple Mac OS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 13, 2025
- ELSA-2017-2479 Important: httpd security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Aug 15, 2017
References
- RHSA-2017:3113 vendor-advisory
- https://support.apple.com/HT208221
- RHSA-2017:2479 vendor-advisory
- RHSA-2017:2483 vendor-advisory
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03908en_us
- https://httpd.apache.org/security/vulnerabilities_22.html
- https://security.netapp.com/advisory/ntap-20170911-0002/
- RHSA-2017:3240 vendor-advisory
- RHSA-2017:2709 vendor-advisory
- RHSA-2017:3195 vendor-advisory
- [announce] 20170713 CVE-2017-9788: Uninitialized memory reflection in mod_auth_digest mailing-list
- 99569 vdb-entry
- http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
- RHSA-2017:3239 vendor-advisory
- RHSA-2017:3114 vendor-advisory
- https://httpd.apache.org/security/vulnerabilities_24.html
- RHSA-2017:3194 vendor-advisory
- 1038906 vdb-entry
- RHSA-2017:3193 vendor-advisory
- RHSA-2017:2710 vendor-advisory
- DSA-3913 vendor-advisory
- RHSA-2017:2708 vendor-advisory
- GLSA-201710-32 vendor-advisory
- RHSA-2017:2478 vendor-advisory
- [httpd-cvs] 20190815 svn commit: r1048743 [4/4] - 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: r1048742 [4/4] - 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 [3/4] - 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: r1048742 [3/4] - 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
- https://www.tenable.com/security/tns-2019-09
- [httpd-cvs] 20200401 svn commit: r1058586 [3/4] - 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 [4/4] - 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 [4/4] - 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 [3/4] - 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: r1073140 [3/4] - 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: r1073140 [4/4] - 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: r1073139 [11/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1888194 [11/13] - /httpd/site/trunk/content/security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073146 [2/3] - in /websites/staging/httpd/trunk/content: ./ security/cvejsontohtml.py security/vulnerabilities-httpd.xml security/vulnerabilities_22.html security/vulnerabilities_24.html mailing-list
- [httpd-cvs] 20210330 svn commit: r1073149 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073149 [11/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073146 [3/3] - in /websites/staging/httpd/trunk/content: ./ security/cvejsontohtml.py security/vulnerabilities-httpd.xml security/vulnerabilities_22.html security/vulnerabilities_24.html mailing-list
- [httpd-cvs] 20210422 svn commit: r1074079 [2/3] - in /websites/staging/httpd/trunk/content: ./ apreq/ contribute/ contributors/ dev/ docs-project/ docs/ info/ mod_fcgid/ mod_ftp/ mod_mbox/ mod_smtpd/ modules/ security/ test/ test/flood/ mailing-list
- [httpd-cvs] 20210603 svn commit: r1075360 [2/3] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2021-31618.json security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabiliti mailing-list
- [httpd-cvs] 20210606 svn commit: r1075467 [2/2] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2021-31618.json security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabiliti mailing-list
- [httpd-cvs] 20210606 svn commit: r1075470 [3/4] - 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