How severe is CVE-2001-0546?

CVE-2001-0546 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2001-0546 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 17% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2001-0546?

CVE-2001-0546 affects Microsoft Isa Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2001-0546?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2001-0546 published?

CVE-2001-0546 was published on 2001-09-20 and last updated on 2026-06-16.

CVE-2001-0546

CVE-2001-0546 is a medium-severity vulnerability in Microsoft Isa Server with a CVSS 2.0 base score of 5.0. Its EPSS exploit-prediction score of 17% places it in the 97th percentile, indicating an elevated likelihood of exploitation.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 17% (97th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Isa Server
Published: 2001-09-20
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is CVE-2001-0546?: 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.
How severe is CVE-2001-0546?: CVE-2001-0546 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2001-0546 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 17% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2001-0546?: CVE-2001-0546 affects Microsoft Isa Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2001-0546?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2001-0546 published?: CVE-2001-0546 was published on 2001-09-20 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:microsoft:isa_server:2000:*:*:*:*:*:*:*

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