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CVE-2001-1533

22
FAUCET Score

CVE-2001-1533 describes a denial-of-service vulnerability in Microsoft ISA Server 2000, where a remote attacker could disrupt service by flooding the server with fragmented UDP packets. This issue has a medium severity CVSS score of 5.3, indicating a network-based attack with low complexity that primarily impacts availability. While the vendor disputed the severity, citing the high bandwidth required for exploitation, the potential for service disruption remains. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
2000CPE matchmatch criteria
cpe:2.3:a:microsoft:isa_server:2000:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

AV:N/AC:L/Au:N/C:N/I:N/A:P

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
18.01%
Probability of exploitation in next 30 days
EPSS Percentile
96.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.1801 is in the 97th percentile among its peer group of 23,701 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

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