The Electronic Messaging System Microsoft Data Base (EMSMDB32) provider in Microsoft Exchange 2000 Server SP3 and Exchange Server 2003 SP2, as used in Exchange System Attendant, allows remote attackers to cause a denial of service (application outage) via a malformed MAPI command, aka "Literal Processing Vulnerability."
Conclusion & alert: CVE-2009-0099 is rated Moderate Risk (51.3/100): CVSS Medium severity, with high exploitation likelihood (EPSS 67.89%, 99th 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 | 2026-05-16 | 71.06% | 67.89% | -3.17% |
| 2 | 2026-05-15 | 67.89% | 71.06% | +3.17% |
| 3 | 2026-05-13 | — | 67.89% | — |
Full EPSS history (32 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 | exchange_server | 2000 | cpe:2.3:a:microsoft:exchange_server:2000:sp3:*:*:*:*:*:* |
| microsoft | exchange_server | 2003 | cpe:2.3:a:microsoft:exchange_server:2003:sp2:*:*:*:*:*:* |
| microsoft | exchange_server | 2007 | cpe:2.3:a:microsoft:exchange_server:2007:sp1:*:*:*:*:*:* |