The installation of Microsoft Exchange 2000 before Rev. A creates a user account with a known password, which could allow attackers to gain privileges, aka the "Exchange User Account" vulnerability.
Conclusion & alert: CVE-2000-1139 is rated Moderate Risk (60.4/100): CVSS High severity, with high exploitation likelihood (EPSS 5.02%, 91th 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 | 6.51% | 5.02% | -1.49% |
| 2 | 2026-06-09 | 6.26% | 6.51% | +0.25% |
| 3 | 2026-06-07 | — | 6.26% | — |
Full EPSS history (23 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 7.5 | 2.0 | HIGH |
|
10.0 | 6.4 | [email protected] |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| microsoft | exchange_server | 2000 | cpe:2.3:a:microsoft:exchange_server:2000:-:*:*:*:*:*:* |
| URL | Tags |
|---|---|
| http://www.securityfocus.com/bid/1958 | Patch Third Party Advisory VDB Entry Vendor Advisory |
| https://docs.microsoft.com/en-us/security-updates/securitybulletins/2000/ms00-088 | Patch Vendor Advisory |
| https://exchange.xforce.ibmcloud.com/vulnerabilities/5537 | VDB Entry |