Summary
generated automatically from NVD dataCVE-2001-0509 affects the RPC servers in Microsoft Exchange Server (2000 and earlier), Microsoft SQL Server (2000 and earlier), Windows NT 4.0 and Windows 2000. The flaw is an input validation weakness (CWE-20): a remote attacker can send malformed inputs to these services and cause a denial of service. No authentication is needed, and the impact is limited to availability. The CVSS v2.0 score is 5.0 (MEDIUM).
NVD description
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.
EPSS · FIRST.org
17.0%probability of exploitation in the next 30 days
Higher than 97% of scored CVEs
EPSS (Exploit Prediction Scoring System) estimates, from observed exploitation activity, how likely a CVE is to be exploited in the next 30 days. It complements CVSS, which measures severity, not likelihood. Score of 2026-10-29, recomputed daily by FIRST.org.
CVSS v2.0 Score
Information
- Published
- 20 sept. 2001
- Updated
- 16 juin 2026
- Status
- Modified
- Source
- cve@mitre.org
Affected products
Bounds published by NVD: "< 8.4.27" means 8.4.27 is no longer vulnerable. The fixed release to install is in the vendor advisory.
Weaknesses (CWE)
References (4)
Similar CVEs
Other vulnerabilities of type CWE-20
Know which CVEs hit the versions you run.
Add the product and its version: cveo.tech lists the CVEs that affect it right away, then alerts you by email when a new one affects it — including before NVD has finished its analysis. Free, an account is all it takes.