Security incident · CVE-2001-0543
Memory leak in NNTP service in Windows NT 4.0 and Windows 2000 allows remote attackers to cause a denial of service (memory exhaustion) via a large number of malformed posts.
Published Sep 20, 2001 · catalog updated Jun 16, 2026 · windows nt
Last checked Nov 2, 2026. A connected source was read within the last 7 days.
Check this week
CVE-2001-0543 is not in CISA KEV. FIRST estimates a 18.84% chance of exploitation in the next 30 days. Check whether you run windows nt.
Gaps on this record
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
Same product and reporting
- CVE-2004-0574 · Critical
- CVE-2002-0862 · Medium
- Severity
- Medium5.0
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 18.84%
- Remediation
- Advisory link
- Affected products
- cpe microsoft/exchange server · cpe microsoft/windows 2000 · cpe microsoft/windows nt
Memory leak in NNTP service in Windows NT 4.0 and Windows 2000 allows remote attackers to cause a denial of service (memory exhaustion) via a large number of malformed posts.
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/windows 2000version unspecified
- cpe microsoft/windows nt4.0
How to fix CVE-2001-0543
No stored fix
No vendor fix text is stored. Use the linked advisory before you change production.
Version check
Seen in 4.0
Advisory
Open the cve_org 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-2001-0543 is not in CISA KEV. FIRST estimates a 18.84% chance of exploitation in the next 30 days. Check whether you run windows nt.
Which versions are affected?
Compare what you have installed with microsoft/exchange server 2000; microsoft/windows nt 4.0. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-401: Missing Release of Memory after Effective Lifetime. EPSS 18.84%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Technology hubs
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.
Sep 20, 2001 · Monitored products — critical
Detected
Memory leak in NNTP service in Windows NT 4.0 and Windows 2000 allows remote attackers to cause a denial of service (memory exhaustion) via a large number of malformed posts.
Jun 16, 2026 · Monitored products — critical
Updated
Memory leak in NNTP service in Windows NT 4.0 and Windows 2000 allows remote attackers to cause a denial of service (memory exhaustion) via a large number of malformed posts.
Sources
- CVE.orgVulnerability recordCVE-2001-0543
Official CVE identifier
cve.org - Monitored products — criticalVendor advisoryCVE-2001-0543
Memory leak in NNTP service in Windows NT 4.0 and Windows 2000 allows remote attackers to cause a denial of service (memory exhaustion) via a large number of malformed posts.
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.
- CVE.orgNov 2, 2026
- Monitored products — criticalNov 1, 2026