5.3

CVE-2001-1533: microsoft isa_server

CVSS: 5.3v3.1MediumModified
Published 14-07-2005Last modified 16-01-2025
Open JSON

Vulnerability summary

CVE-2001-1533 is a medium (CVSS 5.3) vulnerability in microsoft isa_server. EPSS estimates a 18.01% chance of exploitation in the next 30 days, higher than 97.1% of scored vulnerabilities.

Overall risk
25/100
0100
Medium · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
18.01%
0%100%
Medium · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 14-07-2005
    PublishedVulnerability first disclosed.
  2. 16-01-2025
    Last modifiedVulnerability information updated.

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 metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

18.01%

Chance of exploitation in the next 30 days

Percentile

97%

Versus all other CVEs

30-day change

0.00 pp

From 18.01% on 19-09-2026

19-09-202619-10-2026
EPSS score
18.01%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Microsoft1 product

1 vendor · 1 product

References

4 links