CVE-2019-17567: mod_proxy_wstunnel tunneling of non Upgraded connections
Vulnerability summary
CVE-2019-17567 is a medium (CVSS 5.3) vulnerability in apache software foundation apache http server. EPSS estimates a 60.27% chance of exploitation in the next 30 days, higher than 99.1% of scored vulnerabilities.
Not severe (CVSS 5.3, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 3Timeline
- 10-06-2021PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- OSV · DebianEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
EPSS trend
Probability
60.27%
Chance of exploitation in the next 30 days
Percentile
99%
Versus all other CVEs
30-day change
No change 0.00 pp
From 60.27% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Oracle3 products
- enterprise_manager_ops_center12.4.0.0
- instantis_enterprisetrack17.1 | 17.2 | 17.3
- zfs_storage_appliance_kit8.8
Apache1 product
- http_server≥ 2.4.6, ≤ 2.4.46
Apache software foundation1 product
- apache http server2.4.46 | 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
Debian1 product
- apache2< 2.4.48-2
Fedoraproject1 product
- fedoraEOL34 | 35
Ubuntu1 product
- apache2All versions (No fix recorded)
6 vendors · 8 products
References
17 links- lists.apache.org/thread.html/…Mailing List
- lists.apache.org/thread.html/…Mailing List
- lists.fedoraproject.org/archives/…Vendor Advisory
- lists.fedoraproject.org/archives/…Vendor Advisory
- www.oracle.com/security-alerts/cpuoct2021.htmlThird Party Advisory
- security.netapp.com/advisory/ntap-20210702-0001/Third Party Advisory
