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Vulnerabilities

Vulnerability · 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 a…

Published Sep 20, 2001 · catalog updated Jun 16, 2026 · exchange server

Last checked Nov 1, 2026. A connected source was read within the last 7 days.

Check this week

CVE-2001-0509 is not in CISA KEV. FIRST estimates a 16.98% chance of exploitation in the next 30 days. Check whether you run exchange server.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium5.0
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
16.98%
Remediation
Advisory link
Affected products
cpe microsoft/exchange server · cpe microsoft/sql server · cpe microsoft/windows nt

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/exchange server2000
  • cpe microsoft/exchange server5.0
  • cpe microsoft/exchange server5.5
  • cpe microsoft/sql server7.0
  • cpe microsoft/windows nt4.0

How to fix CVE-2001-0509

  • No stored fix

    No vendor fix text is stored. Use the linked advisory before you change production.

  • Version check

    Seen in 5.0 · 3 other packages on the advisory

  • Advisory

    Open the inventory_critical record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2001-0509 is not in CISA KEV. FIRST estimates a 16.98% chance of exploitation in the next 30 days. Check whether you run exchange server.

Which versions are affected?

Compare what you have installed with microsoft/exchange server 2000; microsoft/exchange server 5.0; microsoft/exchange server 5.5; microsoft/sql server 7.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-20: Improper Input Validation. EPSS 16.98%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Microsoft Exchange Server securityWindows security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 20, 2001 · Monitored products — critical

    Detected

    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.

  2. Jun 16, 2026 · Monitored products — critical

    Updated

    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.

Sources

  • Monitored products — criticalVendor advisoryCVE-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.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 1, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • Monitored products — criticalNov 1, 2026