CVE-1999-1591
Microsoft Internet Information Services (IIS) server 4.0 SP4, without certain hotfixes released...
CVE-1999-1591 is a high vulnerability (CVSS 7.5) in Microsoft Visual Interdev, published December 31, 1999. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 11.3%, the 95th percentile. No source names a fixed version.
Microsoft Internet Information Services (IIS) server 4.0 SP4, without certain hotfixes released for SP4, does not require authentication credentials under certain conditions, which allows remote attackers to bypass authentication requirements, as demonstrated by connecting via Microsoft Visual InterDev 6.0.
Exploit likelihood
What each source reports
NVD Score used
Microsoft Internet Information Services (IIS) server 4.0 SP4, without certain hotfixes released for SP4, does not require authentication credentials under certain conditions, which allows remote attackers to bypass authentication requirements, as demonstrated by connecting via Microsoft Visual InterDev 6.0.
- Record
CVE-1999-1591- CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Updated
- 2026-11-02
CVE List No score
Microsoft Internet Information Services (IIS) server 4.0 SP4, without certain hotfixes released for SP4, does not require authentication credentials under certain conditions, which allows remote attackers to bypass authentication requirements, as demonstrated by connecting via Microsoft Visual InterDev 6.0.
- Record
CVE-1999-1591- Updated
- 2026-11-02
EUVDEUVD-1999-1572 No score
Microsoft Internet Information Services (IIS) server 4.0 SP4, without certain hotfixes released for SP4, does not require authentication credentials under certain conditions, which allows remote attackers to bypass authentication requirements, as demonstrated by connecting via Microsoft Visual InterDev 6.0.
- Record
EUVD-1999-1572- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-x4j4-xc7j-8rv5 No score
Microsoft Internet Information Services (IIS) server 4.0 SP4, without certain hotfixes released...
Microsoft Internet Information Services (IIS) server 4.0 SP4, without certain hotfixes released for SP4, does not require authentication credentials under certain conditions, which allows remote attackers to bypass authentication requirements, as demonstrated by connecting via Microsoft Visual InterDev 6.0.
- Record
GHSA-x4j4-xc7j-8rv5- Updated
- 2026-11-02
Affected products
History
| When | Changed | Sources |
|---|---|---|
| 2026-11-03 | aliases | EUVD |
| 2026-11-02 | created | CVE List, GitHub Advisories, NVD |