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Vulnerability record · CVE-2001-1533 · published 31 December 2001

CVE-2001-1533: Microsoft isa server vulnerability

Microsoft · Isa Server

Microsoft Internet Security and Acceleration (ISA) Server 2000 allows remote attackers to cause a denial of service via a flood of fragmented UDP packets. NOTE: the vendor disputes this issue, saying that it requires high bandwidth to exploit, and the server does not experience any instability. Therefore this "laws of physics" issue might not be included in CVE

5.3 CVSS 3.1 Medium EPSS 18% · top 2.9%
5.3CVSS 3.1 base score, v2 5.0
18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
16 Jun 2026Last modified by NVD

Description

Microsoft Internet Security and Acceleration (ISA) Server 2000 allows remote attackers to cause a denial of service via a flood of fragmented UDP packets. NOTE: the vendor disputes this issue, saying that it requires high bandwidth to exploit, and the server does not experience any instability. Therefore this "laws of physics" issue might not be included in CVE

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://cert.uni-stuttgart.de/archive/bugtraq/2001/11/msg00018.html
http://cert.uni-stuttgart.de/archive/bugtraq/2001/11/msg00031.html
http://www.iss.net/security_center/static/7446.php
http://www.securityfocus.com/bid/3501
http://cert.uni-stuttgart.de/archive/bugtraq/2001/11/msg00018.html
http://cert.uni-stuttgart.de/archive/bugtraq/2001/11/msg00031.html
http://www.iss.net/security_center/static/7446.php
http://www.securityfocus.com/bid/3501

Track CVE-2001-1533 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2001-1533), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.