Cisco TelePresence Video Communication Server (VCS) Expressway X8.5.2 allows remote attackers to cause a denial of service via invalid variables in an authentication packet, aka Bug ID CSCuv40469.
Conclusion & alert: CVE-2015-4317 is rated Moderate Risk (50.9/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 2.60%). Core evidence: EPSS rose +1.76% over the last day, indicating growing attacker interest. Mandatory action: Review affected assets and schedule 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 | 0.83% | 2.60% | +1.76% |
| 2 | 2025-06-13 | 1.60% | 0.83% | -0.77% |
| 3 | 2025-03-30 | — | 1.60% | — |
Full EPSS history (7 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 |
|---|---|---|---|
| cisco | telepresence_video_communication_server_software | x8.5.2 | cpe:2.3:a:cisco:telepresence_video_communication_server_software:x8.5.2:*:*:*:*:*:*:* |