CVE-2019-17567
published 2021-06-10CVE-2019-17567: 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…
PriorityP351medium5.3CVSS 3.1
AVNACLPRNUINSUCNILAN
EPSS
60.27%
99.0th percentile
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
35 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| apache | http_server | 2.4.6 – 2.4.46 | — |
| apache_software_foundation | apache_http_server | — | — |
| apache_software_foundation | apache_http_server | — | — |
| apache_software_foundation | apache_http_server | — | — |
| apache_software_foundation | apache_http_server | — | — |
| apache_software_foundation | apache_http_server | — | — |
| apache_software_foundation | apache_http_server | — | — |
| apache_software_foundation | apache_http_server | — | — |
| apache_software_foundation | apache_http_server | — | — |
| apache_software_foundation | apache_http_server | — | — |
| apache_software_foundation | apache_http_server | — | — |
| apache_software_foundation | apache_http_server | — | — |
| apache_software_foundation | apache_http_server | — | — |
| apache_software_foundation | apache_http_server | — | — |
| apache_software_foundation | apache_http_server | — | — |
| apache_software_foundation | apache_http_server | — | — |
| apache_software_foundation | apache_http_server | — | — |
| apache_software_foundation | apache_http_server | — | — |
| apache_software_foundation | apache_http_server | — | — |
| apache_software_foundation | apache_http_server | — | — |
| apache_software_foundation | apache_http_server | — | — |
| apache_software_foundation | apache_http_server | — | — |
| apache_software_foundation | apache_http_server | — | — |
| apache_software_foundation | apache_http_server | — | — |
| apache_software_foundation | apache_http_server | — | — |
Detection & IOCsextracted from sources · hover to see the quote
- →Only Apache HTTP Server configurations using mod_proxy_wstunnel are affected; detect active loading of the module as an exposure indicator ↗
- →Look for HTTP requests on a proxied WebSocket connection that were NOT preceded by a successful HTTP 101 Upgrade response — these would be tunneled through without authentication/authorization checks ↗
- →Upstream patch available for code-level diff and rule authoring at the referenced SVN revision ↗
- ·Vulnerable version range is Apache HTTP Server 2.4.6 through 2.4.46; fixed in 2.4.48 and later ↗
- ·The vulnerability is only exploitable when mod_proxy_wstunnel is loaded and configured; disabling the module fully mitigates the issue ↗
- ·Debian fixed the issue in package version 2.4.48-2 across all active release tracks (bookworm, bullseye, forky, sid, trixie) ↗
CVSS provenance
nvdv3.15.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
nvdv2.05.0MEDIUMAV:N/AC:L/Au:N/C:N/I:P/A:N
osv5.3MEDIUM
vendor_debian5.3MEDIUM
vendor_msrc5.3MEDIUM
vendor_redhat5.3MEDIUM
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GHSA
GHSA-qf63-wqjv-7x2f: Apache HTTP Server versions 2
ghsa_unreviewed·2022-05-24
CVE-2019-17567 [MEDIUM] CWE-444 GHSA-qf63-wqjv-7x2f: Apache HTTP Server versions 2
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.
OSV
CVE-2019-17567: Apache HTTP Server versions 2
osv·2021-06-10·CVSS 5.3
CVE-2019-17567 [MEDIUM] CVE-2019-17567: Apache HTTP Server versions 2
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.
Microsoft
mod_proxy_wstunnel tunneling of non Upgraded connections
vendor_msrc·2021-06-08·CVSS 5.3
CVE-2019-17567 [MEDIUM] CWE-444 mod_proxy_wstunnel tunneling of non Upgraded connections
mod_proxy_wstunnel tunneling of non Upgraded connections
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.
Mariner: Mariner
apache: apache
Customer Action Required: Yes
Remediation: CBL-Mariner Releases
Reference: https://le
Red Hat
httpd: mod_proxy_wstunnel tunneling of non Upgraded connection
vendor_redhat·2021-06-04·CVSS 5.3
CVE-2019-17567 [MEDIUM] CWE-287 httpd: mod_proxy_wstunnel tunneling of non Upgraded connection
httpd: mod_proxy_wstunnel tunneling of non Upgraded connection
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.
A flaw was found in Apache httpd. The mod_proxy_wstunnel module tunnels non-upgraded connections.
Mitigation: Only configurations which use mod_proxy_wstunnel are affected by this flaw. It is also safe to comment-out the "LoadModule proxy_wstunnel_module ... " line in /etc/httpd/conf.modules.d/00-proxy.conf for configurations which do not rely on a websockets reverse proxy.
Package: httpd (
Debian
CVE-2019-17567: apache2 - Apache HTTP Server versions 2.4.6 to 2.4.46 mod_proxy_wstunnel configured on an ...
vendor_debian·2019·CVSS 5.3
CVE-2019-17567 [MEDIUM] CVE-2019-17567: apache2 - Apache HTTP Server versions 2.4.6 to 2.4.46 mod_proxy_wstunnel configured on an ...
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.
Scope: local
bookworm: resolved (fixed in 2.4.48-2)
bullseye: resolved (fixed in 2.4.48-2)
forky: resolved (fixed in 2.4.48-2)
sid: resolved (fixed in 2.4.48-2)
trixie: resolved (fixed in 2.4.48-2)
No detection rules found.
No public exploits indexed.
http://httpd.apache.org/security/vulnerabilities_24.htmlhttp://www.openwall.com/lists/oss-security/2021/06/10/2https://lists.apache.org/thread.html/r7f2b70b621651548f4b6f027552f1dd91705d7111bb5d15cda0a68dd%40%3Cdev.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r90f693a5c9fb75550ef1412436d5e682a5f845beb427fa6f23419a3c%40%3Cannounce.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/re026d3da9d7824bd93b9f871c0fdda978d960c7e62d8c43cba8d0bf3%40%3Ccvs.httpd.apache.org%3Ehttps://lists.debian.org/debian-lts-announce/2024/05/msg00013.htmlhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPBR6WUYBJNACHKE65SPL7TJOHX7RHWD/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNCYSR3BXT36FFF4XTCPL3HDQK4VP45R/https://security.gentoo.org/glsa/202107-38https://security.netapp.com/advisory/ntap-20210702-0001/https://www.oracle.com/security-alerts/cpuoct2021.htmlhttp://httpd.apache.org/security/vulnerabilities_24.htmlhttp://www.openwall.com/lists/oss-security/2021/06/10/2https://lists.apache.org/thread.html/r7f2b70b621651548f4b6f027552f1dd91705d7111bb5d15cda0a68dd%40%3Cdev.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r90f693a5c9fb75550ef1412436d5e682a5f845beb427fa6f23419a3c%40%3Cannounce.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/re026d3da9d7824bd93b9f871c0fdda978d960c7e62d8c43cba8d0bf3%40%3Ccvs.httpd.apache.org%3Ehttps://lists.debian.org/debian-lts-announce/2024/05/msg00013.htmlhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPBR6WUYBJNACHKE65SPL7TJOHX7RHWD/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNCYSR3BXT36FFF4XTCPL3HDQK4VP45R/https://security.gentoo.org/glsa/202107-38https://security.netapp.com/advisory/ntap-20210702-0001/https://www.oracle.com/security-alerts/cpuoct2021.html
2021-06-10
Published