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CVE-2001-1533

5.3 · MEDIUM

Microsoft Internet Security and Acceleration (ISA) Server 2000 allows remote attackers to cause a denial of service via a flood of fragmented UDP packets.

Published Dec 31, 2001microsoftEPSS 18.01%

Overview

CVE-2001-1533 is a medium-severity vulnerability affecting microsoft isa_server. It was published on December 31, 2001 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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

Remediation

Check the references section for vendor advisories and patches from microsoft. Update isa_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus

References

Refcert.uni-stuttgart.de/archive/bugtraq/2001/11/msg00018.htmlRefcert.uni-stuttgart.de/archive/bugtraq/2001/11/msg00031.htmlRefwww.iss.net/security_center/static/7446.phpRefwww.securityfocus.com/bid/3501Refcert.uni-stuttgart.de/archive/bugtraq/2001/11/msg00018.htmlRefcert.uni-stuttgart.de/archive/bugtraq/2001/11/msg00031.htmlRefwww.iss.net/security_center/static/7446.phpRefwww.securityfocus.com/bid/3501

How CyberStrike helps

Frequently asked questions

What is CVE-2001-1533?

CVE-2001-1533 is a medium-severity vulnerability affecting microsoft isa_server. It was published on December 31, 2001 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2001-1533?

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2001-1533?

Check the references section for vendor advisories and patches from microsoft. Update isa_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2001-1533?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2001-1533 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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