IBM Lotus Sametime 8.5.2 and 8.5.2.1 allows remote attackers to cause a denial of service (WebPlayer Firefox extension crash) via a crafted Audio Visual (AV) session.
Conclusion & alert: CVE-2013-3986 is rated Moderate Risk (49.9/100): CVSS Medium severity, with high exploitation likelihood (EPSS 39.23%, 97th 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 | 2025-12-29 | 40.56% | 39.23% | -1.34% |
| 2 | 2025-03-30 | 37.81% | 40.56% | +2.75% |
| 3 | 2025-03-29 | — | 37.81% | — |
Full EPSS history (14 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 | Product | Version | Raw CPE |
|---|---|---|---|
| ibm | lotus_sametime | 8.5.2 | cpe:2.3:a:ibm:lotus_sametime:8.5.2:*:*:*:*:*:*:* |
| ibm | lotus_sametime | 8.5.2.1 | cpe:2.3:a:ibm:lotus_sametime:8.5.2.1:*:*:*:*:*:*:* |