CVE-2001-1533

Isa Server vulnerability

CVSS

5.3

EPSS

18.0%

EPSS pct

97th

Exploited

No known

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

Affected vendor

Microsoft

Affected product

Isa Server

CVSS vector

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

Published

2001-12-31

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to low impact to availability.

Its EPSS score of 18.0% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 97% of all scored CVEs.

Check your external exposure to CVE-2001-1533

Confirm whether Microsoft Isa Server is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2001-1533.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2001-1533

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2001-1533 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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