The ap_some_auth_required function in server/request.c in the Apache HTTP Server 2.4.x before 2.4.14 does not consider that a Require directive may be associated with an authorization setting rather than an authentication setting, which allows remote attackers to bypass intended access restrictions in opportunistic circumstances by leveraging the presence of a module that relies on the 2.2 API behavior.
Conclusion & alert: CVE-2015-3185 is rated Moderate Risk (46/100): CVSS Medium severity, with high exploitation likelihood (EPSS 6.37%, 91th percentile). Core evidence: EPSS ranks this CVE among the most likely to be exploited in the near term. Mandatory action: High exploitation likelihood—assess exposure and prioritize remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-05-24 | 9.49% | 6.37% | -3.12% |
| 2 | 2026-03-04 | 4.47% | 9.49% | +5.02% |
| 3 | 2026-03-01 | — | 4.47% | — |
Full EPSS history (37 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 4.3 | 2.0 | MEDIUM |
|
8.6 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2015-3185 not yet assigned priority: Debian including 1 source packages (apache2), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2015-3185 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2015-3185 |
ubuntu
|
medium | CVE-2015-3185 medium priority: Ubuntu including 1 source packages (apache2), 5 status rows across 5 suites (precise, trusty, upstream, utopic, vivid): released 3, ignored 1, not-affected 1. | https://ubuntu.com/security/CVE-2015-3185 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| canonical | ubuntu_linux | 12.04 | cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:* |
| canonical | ubuntu_linux | 14.04 | cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* |
| canonical | ubuntu_linux | 15.04 | cpe:2.3:o:canonical:ubuntu_linux:15.04:*:*:*:*:*:*:* |
| apache | http_server | 2.4.0 | cpe:2.3:a:apache:http_server:2.4.0:*:*:*:*:*:*:* |
| apache | http_server | 2.4.1 | cpe:2.3:a:apache:http_server:2.4.1:*:*:*:*:*:*:* |
| apache | http_server | 2.4.2 | cpe:2.3:a:apache:http_server:2.4.2:*:*:*:*:*:*:* |
| apache | http_server | 2.4.3 | cpe:2.3:a:apache:http_server:2.4.3:*:*:*:*:*:*:* |
| apache | http_server | 2.4.4 | cpe:2.3:a:apache:http_server:2.4.4:*:*:*:*:*:*:* |
| apache | http_server | 2.4.6 | cpe:2.3:a:apache:http_server:2.4.6:*:*:*:*:*:*:* |
| apache | http_server | 2.4.7 | cpe:2.3:a:apache:http_server:2.4.7:*:*:*:*:*:*:* |
| apache | http_server | 2.4.8 | cpe:2.3:a:apache:http_server:2.4.8:*:*:*:*:*:*:* |
| apache | http_server | 2.4.9 | cpe:2.3:a:apache:http_server:2.4.9:*:*:*:*:*:*:* |
| apache | http_server | 2.4.10 | cpe:2.3:a:apache:http_server:2.4.10:*:*:*:*:*:*:* |
| apache | http_server | 2.4.12 | cpe:2.3:a:apache:http_server:2.4.12:*:*:*:*:*:*:* |
| apache | http_server | 2.4.13 | cpe:2.3:a:apache:http_server:2.4.13:*:*:*:*:*:*:* |
| apple | xcode | 7.0 | cpe:2.3:a:apple:xcode:7.0:*:*:*:*:*:*:* |
| apple | mac_os_x | 10.10.4 | cpe:2.3:o:apple:mac_os_x:10.10.4:*:*:*:*:*:*:* |
| apple | mac_os_x_server | 5.0.3 | cpe:2.3:o:apple:mac_os_x_server:5.0.3:*:*:*:*:*:*:* |