Denial of service in IIS 4.0 via a flood of HTTP requests with malformed headers.
Priority MEDIUM 42CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · Partial
- Fix status
- No fix listed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA.
Summary
Denial of service in IIS 4.0 via a flood of HTTP requests with malformed headers.
Why it matters now
EPSS 0.21525 97th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:microsoft:commercial_internet_system:2.0:*:*:*:*:*:*:* | 2.0 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:commercial_internet_system:2.5:*:*:*:*:*:*:* | 2.5 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:internet_information_server:4.0:*:*:*:*:*:*:* | 4.0 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:site_server:3.0:unknown:commerce:*:*:*:*:* | 3.0 unknown | Vulnerable | Microsoft |
- cpe:2.3:a:microsoft:commercial_internet_system:2.0:*:*:*:*:*:*:* Versions 2.0 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:commercial_internet_system:2.5:*:*:*:*:*:*:* Versions 2.5 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:internet_information_server:4.0:*:*:*:*:*:*:* Versions 4.0 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:site_server:3.0:unknown:commerce:*:*:*:*:* Versions 3.0 unknown Vulnerable ·Microsoft
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-1999-0867
- 2026-10-03 Alias added: GHSA-m9hv-pvv3-2735
More Microsoft Commercial Internet System vulnerabilities
- TI-2000-00246 IIS 4.0 and 5.0 does not properly perform ISAPI extension processing if a virtual… CVSS 2.0MEDIUM 5.0
- TI-2000-00053 Microsoft Commercial Internet System (MCIS) IMAP server allows remote attackers to cause… CVSS 2.0HIGH 7.5
- TI-1999-00727 IIS FTP servers may allow a remote attacker to read or delete files on the server, even… CVSS 2.0HIGH 7.5
- TI-1999-00860 Microsoft Site Server and Commercial Internet System (MCIS) do not set an expiration for… CVSS 2.0MEDIUM 5.0
- TI-1999-00811 Race condition in the SSL ISAPI filter in IIS and other servers may leak information in plaintext. CVSS 2.0LOW 2.6
Sources
- CVE-1999-0867 · CVE Program
- CVE-1999-0867 · NVD
- FIRST EPSS
- GHSA-m9hv-pvv3-2735 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences