Description
In Apache HTTP Server 2.4 release 2.4.38 and prior, a race condition in mod_auth_digest when running in a threaded server could allow a user with valid credentials to authenticate using another username, bypassing configured access control restrictions.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache | Apache HTTP Server | 2.4.0 to 2.4.38 | — |
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 | 2.4.38-3 | — |
| Debian 13 | apache2 | 2.4.38-3 | — |
| Debian 12 | apache2 | 2.4.38-3 | — |
| Debian 9 | apache2 | 2.4.25-3+deb9u7 | DSA-4422-1 |
| Debian 8 | apache2 | 2.4.10-10+deb8u14 | DLA-1748-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | apache2 | 2.4.29-1ubuntu4.6 | USN-3937-1 |
| Ubuntu 16.04 LTS | apache2 | 2.4.18-2ubuntu3.10 | USN-3937-1 |
| Ubuntu 14.04 LTS | apache2 | 2.4.7-1ubuntu4.22 | USN-3937-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | httpd +7 | 2.4.37-16.module+el8.1.0+4134+e6bad0ed | RHSA-2019:3436 |
| RHEL 8 | mod_http2 | 1.11.3-3.module+el8.1.0+4134+e6bad0ed | RHSA-2019:3436 |
| RHEL 8 | mod_ssl +1 | 1:2.4.37-16.module+el8.1.0+4134+e6bad0ed | RHSA-2019:3436 |
| RHEL 7 | httpd +5 | 2.4.6-90.el7 | RHSA-2019:2343 |
| RHEL 7 | mod_ssl +1 | 1:2.4.6-90.el7 | RHSA-2019:2343 |
| RHEL 3 | httpd24 +3 | 1.1-19.el6 | RHSA-2019:4126 |
| RHEL 3 | httpd24-httpd +5 | 2.4.34-15.el6 | RHSA-2019:4126 |
| RHEL 3 | httpd24-mod_md | 2.4.34-15.el7 | RHSA-2019:4126 |
| RHEL 3 | httpd24-mod_ssl +1 | 1:2.4.34-15.el6 | RHSA-2019:4126 |
| RHEL 3 | httpd24-nghttp2 +2 | 1.7.1-8.el6 | RHSA-2019:4126 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat JBoss Core Services 1 | jbcs-httpd24-apr +1 | 1.6.3-63.jbcs.el6 | RHSA-2019:3933, RHSA-2019:3932 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-apr-util +8 | 1.6.1-48.jbcs.el6 | RHSA-2019:3933, RHSA-2019:3932 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-brotli +1 | 1.0.6-7.jbcs.el6 | RHSA-2019:3933, RHSA-2019:3932 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-curl +2 | 7.64.1-14.jbcs.el6 | RHSA-2019:3933, RHSA-2019:3932 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-httpd +7 | 2.4.37-33.jbcs.el6 | RHSA-2019:3933, RHSA-2019:3932 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-jansson +1 | 2.11-20.jbcs.el6 | RHSA-2019:3933, RHSA-2019:3932 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_cluster-native | 1.3.12-9.Final_redhat_2.jbcs.el6 | RHSA-2019:3933, RHSA-2019:3932 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_jk +2 | 1.2.46-22.redhat_1.jbcs.el6 | RHSA-2019:3933, RHSA-2019:3932 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_security | 2.9.2-16.GA.jbcs.el6 | RHSA-2019:3933, RHSA-2019:3932 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_ssl +1 | 1:2.4.37-33.jbcs.el6 | RHSA-2019:3933, RHSA-2019:3932 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-nghttp2 +1 | 1.39.2-4.jbcs.el6 | RHSA-2019:3933, RHSA-2019:3932 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-openssl +4 | 1:1.1.1-25.jbcs.el6 | RHSA-2019:3933, RHSA-2019:3932 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | apache2 | 2.4.33-3.15.1 | SUSE-SU-2019:0873-1 |
| SLES 12 SP4 | apache2 | 2.4.23-29.40.1 | SUSE-SU-2019:0878-1 |
| SLES 12 SP3 | apache2 | 2.4.23-29.40.1 | SUSE-SU-2019:0878-1 |
| SLES 12 SP2 | apache2 | 2.4.23-29.40.1 | SUSE-SU-2019:0878-1 |
| SLES 12 SP1 | apache2 | 2.4.16-20.24.1 | SUSE-SU-2019:0888-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | apache2 | 2.4.10-14.36.1 | SUSE-SU-2019:0889-1 |
| SLES for SAP 12 SP4 | apache2 | 2.4.23-29.40.1 | SUSE-SU-2019:0878-1 |
| SLES for SAP 12 SP3 | apache2 | 2.4.23-29.40.1 | SUSE-SU-2019:0878-1 |
| SLES for SAP 12 SP2 | apache2 | 2.4.23-29.40.1 | SUSE-SU-2019:0878-1 |
| SLES for SAP 12 SP1 | apache2 | 2.4.16-20.24.1 | SUSE-SU-2019:0888-2 |
| SUSE OpenStack Cloud 7 | apache2 | 2.4.23-29.40.1 | SUSE-SU-2019:0878-1 |
| SUSE Enterprise Storage 4 | apache2 | 2.4.23-29.40.1 | SUSE-SU-2019:0878-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.0 | apache2 | 2.4.33-lp150.2.17.1 | openSUSE-SU-2019:1209-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | apache2 | 2.4.39-r0 | — |
| Alpine v3.23 | apache2 | 2.4.39-r0 | — |
| Alpine v3.22 | apache2 | 2.4.39-r0 | — |
| Alpine v3.21 | apache2 | 2.4.39-r0 | — |
| Alpine v3.20 | apache2 | 2.4.39-r0 | — |
Show 14 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | apache2 | 2.4.39-r0 | — |
| Alpine v3.18 | apache2 | 2.4.39-r0 | — |
| Alpine v3.17 | apache2 | 2.4.39-r0 | — |
| Alpine v3.16 | apache2 | 2.4.39-r0 | — |
| Alpine v3.15 | apache2 | 2.4.39-r0 | — |
| Alpine v3.14 | apache2 | 2.4.39-r0 | — |
| Alpine v3.13 | apache2 | 2.4.39-r0 | — |
| Alpine v3.12 | apache2 | 2.4.39-r0 | — |
| Alpine v3.11 | apache2 | 2.4.39-r0 | — |
| Alpine v3.10 | apache2 | 2.4.39-r0 | — |
| Alpine v3.9 | apache2 | 2.4.39-r0 | — |
| Alpine v3.8 | apache2 | 2.4.39-r0 | — |
| Alpine v3.7 | apache2 | 2.4.39-r0 | — |
| Alpine v3.6 | apache2 | 2.4.39-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | httpd +7 | 2.4.39-1.amzn2.0.1 | ALAS2-2019-1189 |
| Amazon Linux 2 | mod_ssl +1 | 1:2.4.39-1.amzn2.0.1 | ALAS2-2019-1189 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | httpd +7 | 2.4.37-16.0.1.module+el8.1.0+5385+dcd9ff33 | ELSA-2019-3436 |
| Oracle Linux 8 | mod_http2 | 1.11.3-3.module+el8.1.0+5385+dcd9ff33 | ELSA-2019-3436 |
| Oracle Linux 8 | mod_ssl +1 | 1:2.4.37-16.0.1.module+el8.1.0+5385+dcd9ff33 | ELSA-2019-3436 |
| Oracle Linux 7 | httpd +5 | 2.4.6-90.0.1.el7 | ELSA-2019-2343 |
| Oracle Linux 7 | mod_ssl +1 | 1:2.4.6-90.0.1.el7 | ELSA-2019-2343 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
-
savsch/PoC_CVE-2019-0217 ★ 0 · Oct 6, 2024
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 18
- RHSA-2019:3933 Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.37 Security Release on RHEL 7 Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2019:3932 Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.37 Security Release on RHEL 6 Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2019:4126 Red Hat Security Advisory: httpd24-httpd security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHSA-2019:3436 Red Hat Security Advisory: httpd:2.4 security and bug fix update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHSA-2019:2343 Red Hat Security Advisory: httpd security and bug fix update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- USN-3937-1 apache2 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4422-1 apache2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1748-1 apache2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2019:0878-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0889-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0873-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:1209-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0888-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0888-2 Security update for apache2 SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2023-2047 Apache HTTP Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 13, 2023
- ELSA-2019-3436 Moderate: httpd:2.4 security and bug fix update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 14, 2019
- ELSA-2019-2343 Moderate: httpd security and bug fix update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Aug 13, 2019
- ALAS2-2019-1189 Important: httpd security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · May 20, 2019
References
- [httpd-dev] 20190402 re: svn commit: r33393 - /release/httpd/CHANGES_2.4 mailing-list
- [oss-security] 20190401 CVE-2019-0217: mod_auth_digest access control bypass mailing-list
- 107668 vdb-entry
- 20190403 [SECURITY] [DSA 4422-1] apache2 security update mailing-list
- [debian-lts-announce] 20190403 [SECURITY] [DLA 1748-1] apache2 security update mailing-list
- USN-3937-1 vendor-advisory
- DSA-4422 vendor-advisory
- FEDORA-2019-119b14075a vendor-advisory
- https://httpd.apache.org/security/vulnerabilities_24.html
- EDORA-2019-cf7695b470 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1695020
- USN-3937-2 vendor-advisory
- openSUSE-SU-2019:1190 vendor-advisory
- openSUSE-SU-2019:1209 vendor-advisory
- https://security.netapp.com/advisory/ntap-20190423-0001/
- openSUSE-SU-2019:1258 vendor-advisory
- FEDORA-2019-a4ed7400f4 vendor-advisory
- https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html
- RHSA-2019:2343 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
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03950en_us
- https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html
- RHSA-2019:3436 vendor-advisory
- RHSA-2019:3933 vendor-advisory
- RHSA-2019:3935 vendor-advisory
- RHSA-2019:3932 vendor-advisory
- RHSA-2019:4126 vendor-advisory
- [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
- https://www.oracle.com/security-alerts/cpuapr2020.html
- [httpd-cvs] 20210330 svn commit: r1073139 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073143 [3/3] - in /websites/staging/httpd/trunk/content: ./ security/ 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 [12/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1888194 [12/13] - /httpd/site/trunk/content/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] 20210330 svn commit: r1073149 [12/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/ mailing-list
- [httpd-cvs] 20210606 svn commit: r1075470 [4/4] - 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