CVE-2001-0509

Vulnerabilities in RPC servers in (1) Microsoft Exchange Server 2000 and earlier, (2) Microsoft SQL Server 2000 and earlier, (3) Windows NT 4.0, and (4) Windows 2000 allow remote attackers to cause a denial of service via malformed inputs.

Published: 2001-09-20 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2001-0509 is rated Moderate Risk (57.8/100): CVSS Medium severity, with high exploitation likelihood (EPSS 16.98%, 97th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +4.01% over the last day, indicating growing attacker interest. 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.

Exploit prediction scoring system (EPSS) score for CVE-2001-0509

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 12.96% 16.98% +4.01%
2 2025-12-28 14.35% 12.96% -1.39%
3 2025-12-27 — 14.35% —

Full EPSS history (18 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2001-0509

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2001-0509

Affected software / configurations for CVE-2001-0509

Vendor Product Version Raw CPE
microsoft exchange_server 5.0 cpe:2.3:a:microsoft:exchange_server:5.0:-:*:*:*:*:*:*
microsoft exchange_server 5.5 cpe:2.3:a:microsoft:exchange_server:5.5:-:*:*:*:*:*:*
microsoft exchange_server 2000 cpe:2.3:a:microsoft:exchange_server:2000:-:*:*:*:*:*:*
microsoft sql_server 7.0 cpe:2.3:a:microsoft:sql_server:7.0:-:*:*:*:*:*:*
microsoft sql_server 2000 cpe:2.3:a:microsoft:sql_server:2000:-:*:*:*:*:*:*
microsoft windows_nt 4.0 cpe:2.3:a:microsoft:windows_nt:4.0:*:*:*:*:*:*:*
microsoft windows_2000 — cpe:2.3:o:microsoft:windows_2000:-:-:*:*:*:*:*:*
microsoft windows_2000 — cpe:2.3:o:microsoft:windows_2000:*:*:*:*:*:*:*:*
microsoft windows_nt 4.0 cpe:2.3:o:microsoft:windows_nt:4.0:*:*:*:*:*:*:*

References for CVE-2001-0509

cvelogic Threat Intelligence