CVE-2001-0509

Name: CVE-2001-0509
Creator: NVD / NIST
Published: 2001-09-20T04:00:00+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 16.98%

Last modified Jun 16, 2026

CVE-2001-0509 is a vulnerability of currently unknown severity. 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 estimates a 16.98% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

16.98%

96.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Microsoft	Exchange Server	5.0
Microsoft	Exchange Server	5.5
Microsoft	Exchange Server	2000
Microsoft	Sql Server	7.0
Microsoft	Sql Server	2000
Microsoft	Windows Nt	4.0
Microsoft	Windows 2000	All versions

References

https://docs.microsoft.com/en-us/security-updates/securitybulletins/2001/ms01-041Patch, Vendor Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A82Third Party Advisory
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2001/ms01-041Patch, Vendor Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A82Third Party Advisory

Timeline

Published: Sep 20, 2001
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2001-0509?

How severe is CVE-2001-0509?

Severity scoring for CVE-2001-0509 is pending analysis. The EPSS model estimates a 16.98% probability of exploitation in the next 30 days.

How do I fix CVE-2001-0509?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2001-0509?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST