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CVE-1999-0012: microsoft internet_information_server Authentication Bypass by Spoofing

CVSS: 7.0v3.1HighModified
Published 29-09-1999Last modified 09-04-2025
Open JSON

Vulnerability summary

CVE-1999-0012 is a high (CVSS 7.0) Authentication Bypass by Spoofing vulnerability in microsoft internet_information_server. EPSS estimates a 18.53% chance of exploitation in the next 30 days, higher than 97.2% of scored vulnerabilities.

Overall risk
32/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.0/10
010
High · v3.1 (CVE.org)
EPSS score
18.53%
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. 29-09-1999
    PublishedVulnerability first disclosed.
  2. 09-04-2025
    Last modifiedVulnerability information updated.

Description

Some web servers under Microsoft Windows allow remote attackers to bypass access restrictions for files with long file names.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

18.53%

Chance of exploitation in the next 30 days

Percentile

97%

Versus all other CVEs

30-day change

0.00 pp

From 18.53% on 18-09-2026

18-09-202618-10-2026
EPSS score
18.53%

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

Affected systems

Microsoft2 products
Netscape2 products

2 vendors · 4 products

References

1 links