The read_request_line function in server/protocol.c in the Apache HTTP Server 2.4.12 does not initialize the protocol structure member, which allows remote attackers to cause a denial of service (NULL pointer dereference and process crash) by sending a request that lacks a method to an installation that enables the INCLUDES filter and has an ErrorDocument 400 directive specifying a local URI.
Conclusion & alert: CVE-2015-0253 is rated Moderate Risk (55.2/100): CVSS Medium severity, with high exploitation likelihood (EPSS 10.76%, 93th percentile). Core evidence: EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +2.48% over the last day, indicating growing attacker interest. 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 | 2026-05-29 | 8.28% | 10.76% | +2.48% |
| 2 | 2026-05-24 | 10.61% | 8.28% | -2.33% |
| 3 | 2025-12-28 | — | 10.61% | — |
Full EPSS history (20 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 5.0 | 2.0 | MEDIUM |
|
10.0 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
unimportant | CVE-2015-0253 unimportant 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-2015-0253 |
redhat
|
low | — | https://access.redhat.com/security/cve/CVE-2015-0253 |
suse
|
medium | — | https://www.suse.com/security/cve/CVE-2015-0253/ |
ubuntu
|
medium | CVE-2015-0253 medium priority: Ubuntu including 1 source packages (apache2), 5 status rows across 5 suites (precise, trusty, upstream, utopic, vivid): not-affected 4, released 1. | https://ubuntu.com/security/CVE-2015-0253 |
: <a href="http://cwe.mitre.org/data/definitions/476.html">CWE-476: NULL Pointer Dereference</a>
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| apache | http_server | 2.4.12 | cpe:2.3:a:apache:http_server:2.4.12:*:*:*:*:*:*:* |
| 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:*:*:*:*:*:*:* |
| oracle | linux | 7 | cpe:2.3:o:oracle:linux:7:*:*:*:*:*:*:* |
| oracle | solaris | 11.3 | cpe:2.3:o:oracle:solaris:11.3:*:*:*:*:*:*:* |