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Vulnerability record · CVE-2001-0509 · published 20 September 2001

CVE-2001-0509: Microsoft exchange server improper input validation vulnerability

Microsoft · Exchange Server

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.

5.0 CVSS 2.0 Medium EPSS 17% · top 3.0% CWE-20 · Improper input validation
5.0CVSS 2.0 base score
17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
4References
16 Jun 2026Last modified by 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.

AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2001/ms01-041 PatchVendor Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A82 Third Party Advisory
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2001/ms01-041 PatchVendor Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A82 Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2001-0509), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.