Description
Apache HTTP Server versions 2.4.6 to 2.4.46 mod_proxy_wstunnel configured on an URL that is not necessarily Upgraded by the origin server was tunneling the whole connection regardless, thus allowing for subsequent requests on the same connection to pass through with no HTTP validation, authentication or authorization possibly configured.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server | 2.4.46, 2.4.43, 2.4.41, 2.4.39, 2.4.38, 2.4.37, 2.4.35, 2.4.34, 2.4.33, 2.4.29, 2.4.28, 2.4.27, 2.4.26, 2.4.25, 2.4.23, 2.4.20, 2.4.18, 2.4.17, 2.4.16, 2.4.12, 2.4.10, 2.4.9, 2.4.7, 2.4.6 | — |
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 | 2.4.48-2 | — |
| Debian 13 | apache2 | 2.4.48-2 | — |
| Debian 12 | apache2 | 2.4.48-2 | — |
| Debian 10 | apache2 | 2.4.59-1~deb10u1 | DLA-3818-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | apache2 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | apache2 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | apache2 | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | apache2 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat JBoss Core Services 1 | jbcs-httpd24-apr +1 | 1.6.3-107.el8jbcs | RHSA-2021:4614 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-apr-util +8 | 1.6.1-84.el8jbcs | RHSA-2021:4614 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-curl +2 | 7.78.0-2.el8jbcs | RHSA-2021:4614 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-httpd +6 | 2.4.37-78.el8jbcs | RHSA-2021:4614 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_cluster-native | 1.3.16-9.Final_redhat_2.el8jbcs | RHSA-2021:4614 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_http2 | 1.15.7-21.el8jbcs | RHSA-2021:4614 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_jk +2 | 1.2.48-20.redhat_1.el8jbcs | RHSA-2021:4614 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_md | 1:2.0.8-40.el8jbcs | RHSA-2021:4614 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_security | 2.9.2-67.GA.el8jbcs | RHSA-2021:4614 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_ssl +1 | 1:2.4.37-78.el8jbcs | RHSA-2021:4614 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-nghttp2 +1 | 1.39.2-39.el8jbcs | RHSA-2021:4614 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-openssl +4 | 1:1.1.1g-8.el8jbcs | RHSA-2021:4614 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-openssl-chil | 1.0.0-7.el8jbcs | RHSA-2021:4614 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-openssl-pkcs11 | 0.4.10-22.el8jbcs | RHSA-2021:4614 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | httpd +7 | 2.4.48-2.amzn2 | ALAS2-2021-1674 |
| Amazon Linux 2 | mod_ssl +1 | 1:2.4.48-2.amzn2 | ALAS2-2021-1674 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | httpd | 2.4.52-1 | — |
Advisories 5
- RHSA-2021:4614 Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.37 SP10 security update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- DLA-3818-1 apache2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- WID-SEC-2024-1591 Juniper JUNOS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2024
- WID-SEC-2022-0438 Apache HTTP Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · May 26, 2024
- ALAS2-2021-1674 Moderate: httpd security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jul 1, 2021
References
- http://httpd.apache.org/security/vulnerabilities_24.html
- https://lists.apache.org/thread.html/re026d3da9d7824bd93b9f871c0fdda978d960c7e62d8c43cba8d0bf3%40%3Ccvs.httpd.apache.org%3E
- [httpd-announce] 20210609 CVE-2019-17567: mod_proxy_wstunnel tunneling of non Upgraded connections mailing-list
- [httpd-dev] 20210610 Re: svn commit: r1890598 - in /httpd/site/trunk/content/security/json: CVE-2019-17567.json CVE-2020-13938.json CVE-2020-13950.json CVE-2020-35452.json CVE-2021-26690.json CVE-2021-26691.json CVE-2021-30641.json CVE-2021-31618.jso mailing-list
- [oss-security] 20210609 CVE-2019-17567: Apache httpd: mod_proxy_wstunnel tunneling of non Upgraded connections mailing-list
- GLSA-202107-38 vendor-advisory
- FEDORA-2021-dce7e7738e vendor-advisory
- FEDORA-2021-e3f6dd670d vendor-advisory
- https://www.oracle.com/security-alerts/cpuoct2021.html
- https://security.netapp.com/advisory/ntap-20210702-0001/
- [debian-lts-announce] 20240525 [SECURITY] [DLA 3818-1] apache2 security update mailing-list