The SMTP ALG in Clavister CorePlus before 8.80.04, and 8.81.00, does not properly parse SMTP commands in certain circumstances, which allows remote attackers to bypass address blacklists.
Conclusion & alert: CVE-2007-3803 is rated High Risk (69.4/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 2.26%). Core evidence: EPSS rose +1.19% 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 | 1.07% | 2.26% | +1.19% |
| 2 | 2026-03-04 | 0.51% | 1.07% | +0.56% |
| 3 | 2025-09-30 | — | 0.51% | — |
Full EPSS history (15 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 |
|---|---|---|---|
| clavister | clavister_coreplus | <= 8.80.03 | cpe:2.3:a:clavister:clavister_coreplus:*:*:*:*:*:*:*:* |
| clavister | clavister_coreplus | <= 8.81.00 | cpe:2.3:a:clavister:clavister_coreplus:*:*:*:*:*:*:*:* |