Unspecified vulnerability in the IBM HTTP Server component 5.3 in IBM WebSphere Application Server (WAS) for z/OS allows remote attackers to execute arbitrary commands via unknown vectors.
Conclusion & alert: CVE-2012-5955 is rated High Risk (69.9/100): CVSS Critical severity, with high exploitation likelihood (EPSS 4.40%, 90th 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 | 2026-06-15 | 6.05% | 4.40% | -1.66% |
| 2 | 2026-05-27 | 6.95% | 6.05% | -0.90% |
| 3 | 2025-09-28 | — | 6.95% | — |
Full EPSS history (10 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 10.0 | 2.0 | HIGH |
|
10.0 | 10.0 | [email protected] |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| ibm | http_server | 5.3 | cpe:2.3:a:ibm:http_server:5.3:*:*:*:*:*:*:* |
| ibm | websphere_application_server | — | cpe:2.3:a:ibm:websphere_application_server:-:-:*:*:*:z\/os:*:* |