All vulnerabilities

Servers and applications

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.

Severity
Medium 5.0
Published
20 Sept 2001
Last changed
16 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
17% in the next 30 daysHigher than 97% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
Improper input validation (CWE-20)
Attack
Over the network · No login needed
Attacker can
Slow it down
CVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:P
Sources
NVD

Affected software

SoftwareAffected versions
Microsoft Exchange ServerServers and applications · cpe:a:microsoft:exchange_server
  • Version 5.0
  • Version 5.5
  • Version 2000

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2001-0509
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2001-0509