5

CVE-1999-0867: microsoft commercial_internet_system Improper Input Validation

CVSS: 5.0v2.0MediumModified
Published 04-01-2000Last modified 01-08-2024
Open JSON

Vulnerability summary

CVE-1999-0867 is a medium (CVSS 5.0) Improper Input Validation vulnerability in microsoft commercial_internet_system. EPSS estimates a 21.52% chance of exploitation in the next 30 days, higher than 97.5% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
34/100
0100
Medium · default modelHow is this calculated?
CVSS score
5.0/10
010
Medium · v2.0 (NVD)
EPSS score
21.52%
0%100%
High · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1exploit-database

Timeline

  1. 04-01-2000
    PublishedVulnerability first disclosed.
  2. 01-08-2024
    Last modifiedVulnerability information updated.

Description

Denial of service in IIS 4.0 via a flood of HTTP requests with malformed headers.

CVSS metrics

1 score · 1 source · 1 version

EPSS trend

Probability

21.52%

Chance of exploitation in the next 30 days

Percentile

98%

Versus all other CVEs

30-day change

0.00 pp

From 21.52% on 18-09-2026

18-09-202618-10-2026
EPSS score
21.52%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • exploit-databasedosmultipleVerified

    Microsoft Commercial Internet System 2.0/2.5 / IIS 4.0 / Site Server Commerce Edition 3.0 alpha/3.0 - Denial of Service

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Microsoft3 products

1 vendor · 3 products

References

4 links