Description
Important: Authentication Bypass CVE-2023-41081
The mod_jk component of Apache Tomcat Connectors in some circumstances, such as when a configuration included "JkOptions +ForwardDirectories" but the configuration did not provide explicit mounts for all possible proxied requests, mod_jk would use an implicit mapping and map the request to the first defined worker. Such an implicit mapping could result in the unintended exposure of the status worker and/or bypass security constraints configured in httpd. As of JK 1.2.49, the implicit mapping functionality has been removed and all mappings must now be via explicit configuration. Only mod_jk is affected by this issue. The ISAPI redirector is not affected.
This issue affects Apache Tomcat Connectors (mod_jk only): from 1.2.0 through 1.2.48.
Users are recommended to upgrade to version 1.2.49, which fixes the issue.
History
2023-09-13 Original advisory
2023-09-28 Updated summary
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache Tomcat Connectors | 1.2.0 – ≤ 1.2.48 | — |
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 | libapache-mod-jk | 1:1.2.49-1 | — |
| Debian 13 | libapache-mod-jk | 1:1.2.49-1 | — |
| Debian 12 | libapache-mod-jk | 1:1.2.48-2+deb12u1 | — |
| Debian 10 | libapache-mod-jk | 1:1.2.46-1+deb10u2 | DLA-3580-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | libapache-mod-jk | 1:1.2.48-1ubuntu0.1 | USN-6826-1 |
| Ubuntu 20.04 LTS | libapache-mod-jk | 1:1.2.46-1ubuntu0.1 | USN-6826-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | libapache-mod-jk | 1:1.2.43-1ubuntu0.1~esm1 | USN-6826-1 |
| Ubuntu Pro 16.04 LTS | libapache-mod-jk | 1:1.2.41-1ubuntu0.1~esm1 | USN-8369-2, USN-6826-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | mod_jk | 1.2.49-1.el9_4 | RHSA-2024:2387 |
| RHEL 9 | mod_proxy_cluster | 1.3.20-1.el9_4 | RHSA-2024:2387 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat JBoss Core Services 1 | jbcs-httpd24-curl +2 | 8.4.0-2.el7jbcs | RHSA-2023:7625 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_http2 | 1.15.19-32.el7jbcs | RHSA-2023:7625 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_jk +1 | 1.2.49-1.redhat_1.el7jbcs | RHSA-2023:7625 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-openssl +4 | 1:1.1.1k-16.el7jbcs | RHSA-2023:7625 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | mod_jk | 1.2.49-1.el9_4 | ALSA-2024:2387 |
| AlmaLinux 9 | mod_proxy_cluster | 1.3.20-1.el9_4 | ALSA-2024:2387 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | apache2-mod_jk | 1.2.50-150100.6.12.1 | SUSE-SU-2025:0102-1 |
| SLES 12 SP5 | apache2-mod_jk | 1.2.49-7.9.1 | SUSE-SU-2024:1198-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP5 | apache2-mod_jk | 1.2.49-7.9.1 | SUSE-SU-2024:1198-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.6 | apache2-mod_jk | 1.2.50-150100.6.12.1 | SUSE-SU-2025:0102-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | mod_jk | 1.2.49-1.el9_4 | ELSA-2024-2387 |
| Oracle Linux 9 | mod_proxy_cluster | 1.3.20-1.el9_4 | ELSA-2024-2387 |
Advisories 11
- ALSA-2024:2387 Moderate: mod_jk and mod_proxy_cluster security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2023:7625 Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.57 SP2 security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2024:2387 Red Hat Security Advisory: mod_jk and mod_proxy_cluster security update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- WID-SEC-2023-2337 Apache Tomcat mod_jk Connector: Schwachstelle ermöglicht Umgehung von Sicherheitsmaßnahmen oder Offenlegung von Informationen BSI CERT-Bund (WID) · Jul 23, 2026
- USN-8369-2 libapache-mod-jk regression Ubuntu Security Notices (USN) · Jul 23, 2026
- WID-SEC-2023-2917 Xerox FreeFlow Print Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 30, 2026
- USN-6826-1 libapache-mod-jk vulnerability Ubuntu Security Notices (USN) · Jun 25, 2026
- DLA-3580-1 libapache-mod-jk - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2025:0102-1 Security update for apache2-mod_jk SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:1198-1 Security update for apache2-mod_jk SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2024-2387 Moderate: mod_jk and mod_proxy_cluster security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · May 2, 2024