CVE-2017-3167: apache software foundation apache http server Improper Authentication
Vulnerability summary
CVE-2017-3167 is a critical (CVSS 9.8) Improper Authentication vulnerability in apache software foundation apache http server. EPSS estimates a 20.23% chance of exploitation in the next 30 days, higher than 97.4% of scored vulnerabilities.
Severe, CVSS 9.8 (NVD); no exploitation reported by the 5 checked sources; EPSS 20% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 16 · Related 5Timeline
- 20-06-2017PublishedVulnerability first disclosed.
- 04-11-2025Last modifiedVulnerability information updated.
Description
In Apache httpd 2.2.x before 2.2.33 and 2.4.x before 2.4.26, use of the ap_get_basic_auth_pw() by third-party modules outside of the authentication phase may lead to authentication requirements being bypassed.
CVSS metrics
6 scores · 4 sources · 3 versions- OSV · AlpineEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
20.23%
Chance of exploitation in the next 30 days
Percentile
97%
Versus all other CVEs
30-day change
No change 0.00 pp
From 20.23% 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.
Redhat7 products
- enterprise_linux_desktop6.0 | 7.0
- enterprise_linux_eus6.7 | 7.2 | 7.3 | 7.4 | 7.5 | 7.6 | 7.7
- enterprise_linux_server6.0 | 7.0
- enterprise_linux_server_aus7.2 | 7.3 | 7.4 | 7.6 | 7.7
- enterprise_linux_server_tus7.2 | 7.3 | 7.4 | 7.6 | 7.7
Netapp3 products
Debian2 products
- apache2< 2.4.25-4
- debian_linuxEOL8.0 | 9.0
Alpine1 product
- apache2< 2.4.26-r0
Apache1 product
- http_server≥ 2.2.0, < 2.2.33 | ≥ 2.4.0, < 2.4.26
Apache software foundation1 product
- apache http server2.2.0 to 2.2.32 | 2.4.0 to 2.4.25
Apple1 product
- mac_os_x< 10.13.1
Oracle1 product
Ubuntu1 product
- apache2< 2.4.7-1ubuntu4.16 | < 2.4.18-2ubuntu3.3
9 vendors · 18 products
References
46 links- support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03908en_usX Refsource CONFIRMThird Party Advisory
- www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.htmlX Refsource CONFIRMPatchThird Party Advisory
