The lua_websocket_read function in lua_request.c in the mod_lua module in the Apache HTTP Server through 2.4.12 allows remote attackers to cause a denial of service (child-process crash) by sending a crafted WebSocket Ping frame after a Lua script has called the wsupgrade function.
Conclusion & alert: CVE-2015-0228 is rated Moderate Risk (57.6/100): CVSS Medium severity, with high exploitation likelihood (EPSS 18.94%, 97th percentile). Core evidence: EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +3.70% 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 | 2026-06-15 | 15.24% | 18.94% | +3.70% |
| 2 | 2026-05-24 | 18.71% | 15.24% | -3.47% |
| 3 | 2026-03-04 | — | 18.71% | — |
Full EPSS history (42 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
|
low | CVE-2015-0228 low 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-2015-0228 |
redhat
|
low | — | https://access.redhat.com/security/cve/CVE-2015-0228 |
suse
|
medium | — | https://www.suse.com/security/cve/CVE-2015-0228/ |
ubuntu
|
low | CVE-2015-0228 low priority: Ubuntu including 1 source packages (apache2), 5 status rows across 5 suites (lucid, precise, trusty, upstream, utopic): not-affected 3, needs-triage 1, released 1. | https://ubuntu.com/security/CVE-2015-0228 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| apache | http_server | <= 2.4.12 | cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:* |
| canonical | ubuntu_linux | 10.04 | cpe:2.3:o:canonical:ubuntu_linux:10.04:*:*:*:lts:*:*:* |
| 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 | 14.10 | cpe:2.3:o:canonical:ubuntu_linux:14.10:*:*:*:*:*:*:* |
| 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:*:*:*:*:*:*:* |
| opensuse | opensuse | 13.2 | cpe:2.3:o:opensuse:opensuse:13.2:*:*:*:*:*:*:* |