Symantec AppStream 5.2.x and Symantec Workspace Streaming (SWS) 6.1.x before 6.1 SP4 do not properly perform authentication, which allows remote Workspace Streaming servers and man-in-the-middle attackers to download arbitrary executable files onto a client system, and execute these files, via unspecified vectors.
Conclusion & alert: CVE-2008-4389 is rated High Risk (68/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 2.48%). Core evidence: EPSS rose +1.91% 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 | 0.57% | 2.48% | +1.91% |
| 2 | 2025-09-10 | 0.74% | 0.57% | -0.17% |
| 3 | 2025-03-30 | — | 0.74% | — |
Full EPSS history (7 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 9.3 | 2.0 | HIGH |
|
8.6 | 10.0 | [email protected] |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| symantec | workspace_streaming | 6.1 | cpe:2.3:a:symantec:workspace_streaming:6.1:*:*:*:*:*:*:* |
| symantec | workspace_streaming | 6.1 | cpe:2.3:a:symantec:workspace_streaming:6.1:sp1:*:*:*:*:*:* |
| symantec | workspace_streaming | 6.1 | cpe:2.3:a:symantec:workspace_streaming:6.1:sp2:*:*:*:*:*:* |
| symantec | workspace_streaming | 6.1 | cpe:2.3:a:symantec:workspace_streaming:6.1:sp3:*:*:*:*:*:* |
| symantec | appstream | 5.2 | cpe:2.3:a:symantec:appstream:5.2:*:*:*:*:*:*:* |
| symantec | appstream | 5.2.1 | cpe:2.3:a:symantec:appstream:5.2.1:*:*:*:*:*:*:* |
| symantec | appstream | 5.2.2 | cpe:2.3:a:symantec:appstream:5.2.2:*:*:*:*:*:*:* |
| symantec | appstream | 5.2.3 | cpe:2.3:a:symantec:appstream:5.2.3:*:*:*:*:*:*:* |