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CVE-1999-0861

12
FAUCET Score

CVE-1999-0861 describes a race condition vulnerability in the SSL ISAPI filter affecting Microsoft IIS and other servers, including Microsoft Commercial Internet System and Site Server. This flaw, rated with a CVSS score of 2.6 (LOW), allows for information leakage in plaintext due to a high attack complexity, though it requires no authentication. There is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this very old vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
2.0CPE matchmatch criteria
cpe:2.3:a:microsoft:commercial_internet_system:2.0:*:*:*:*:*:*:*
2.5CPE matchmatch criteria
cpe:2.3:a:microsoft:commercial_internet_system:2.5:*:*:*:*:*:*:*
4.0CPE matchmatch criteria
cpe:2.3:a:microsoft:internet_information_server:4.0:*:*:*:*:*:*:*
3.0CPE matchmatch criteria
cpe:2.3:a:microsoft:site_server:3.0:*:*:*:*:*:*:*
3.0CPE matchmatch criteria
cpe:2.3:a:microsoft:site_server_commerce:3.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

2.6LOW

AV:N/AC:H/Au:N/C:P/I:N/A:N

Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
HIGH
Authentication
NONE
Exploitability Score
4.9
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
3.24%
Probability of exploitation in next 30 days
EPSS Percentile
87.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0324 is in the 85th percentile among its peer group of 1,506 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.3 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

docs.microsoft.com / en-us/security-updates/securitybulletins/1999/ms99-053
support.microsoft.com / default.aspx