Is CVE-2001-0546 being actively exploited?

CVE-2001-0546 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2001-0546?

CVE-2001-0546 has a CVSS 2.0 base score of 5.0 (MEDIUM).

CVE-2001-0546

MEDIUM · CVSS 5.0EPSS 17.3%EU EUVD

Memory leak in H.323 Gatekeeper Service in Microsoft Internet Security and Acceleration (ISA) Server 2000 allows remote attackers to cause a denial of service (resource exhaustion) via a large amount of malformed H.323 data.

Key facts

CVSS score: 5.0 (v2.0)
Severity: MEDIUM
CVSS vector: AV:N/AC:L/Au:N/C:N/I:N/A:P
EPSS score: 17.3% (97th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2001-0538)
Published: September 20, 2001
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2001-0538 in the EU Vulnerability Database. Last updated in EUVD on August 8, 2024.

View on the EU Vulnerability Database

Affected products

microsoft / isa server

Certified products that may be affected

1 FIPS 140 or Common Criteria certified product, from automated matching by sec-certs.org.

ISA Server 2000 with Service Pack 1 and Feature Pack 1, Firewall - Microsoft Corporation - Common Criteria BSI-DSZ-CC-0218-2003 - archived

References

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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