Race condition in the SSL ISAPI filter in IIS and other servers may leak information in plaintext.
Priority LOW 19CWE-362Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- Partial · None · None
- Fix status
- No fix listed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA.
Summary
Race condition in the SSL ISAPI filter in IIS and other servers may leak information in plaintext.
Why it matters now
EPSS 0.0321 88th 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 · 5
| 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:*:*:*:*:*:*:* | 3.0 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:site_server_commerce:3.0:*:*:*:*:*:*:* | 3.0 | 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:*:*:*:*:*:*:* Versions 3.0 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:site_server_commerce:3.0:*:*:*:*:*:*:* Versions 3.0 Vulnerable ·Microsoft
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-1999-0861
- 2026-10-03 Alias added: GHSA-c76m-g7m9-pfh3
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-1999-00817 Denial of service in IIS 4.0 via a flood of HTTP requests with malformed headers. CVSS 2.0MEDIUM 5.0
- TI-1999-00860 Microsoft Site Server and Commercial Internet System (MCIS) do not set an expiration for… CVSS 2.0MEDIUM 5.0
Sources
- CVE-1999-0861 · CVE Program
- CVE-1999-0861 · NVD
- FIRST EPSS
- GHSA-c76m-g7m9-pfh3 · 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