The Response Group Service in Microsoft Lync Server 2010 and 2013 and the Core Components in Lync Server 2013 do not properly handle exceptions, which allows remote attackers to cause a denial of service (daemon hang) via a crafted call, aka "Lync Denial of Service Vulnerability."
Conclusion & alert: CVE-2014-4068 is rated Moderate Risk (49/100): CVSS Medium severity, with high exploitation likelihood (EPSS 19.69%, 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 | 2026-06-15 | 31.15% | 19.69% | -11.45% |
| 2 | 2025-03-30 | 48.55% | 31.15% | -17.40% |
| 3 | 2025-03-29 | — | 48.55% | — |
Full EPSS history (13 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 | Product | Version | Raw CPE |
|---|---|---|---|
| microsoft | lync_server | 2010 | cpe:2.3:a:microsoft:lync_server:2010:*:*:*:*:*:*:* |
| microsoft | lync_server | 2013 | cpe:2.3:a:microsoft:lync_server:2013:*:*:*:*:*:*:* |