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CVE-1999-0191

54
FAUCET Score

CVE-1999-0191 describes a critical vulnerability in Microsoft IIS where the newdsn.exe CGI script allows unauthenticated remote attackers to overwrite arbitrary files on the server. This vulnerability has a CVSS score of 6.4 (MEDIUM) due to its low attack complexity and network-based attack vector, enabling both partial confidentiality and integrity impacts without requiring authentication. While not currently on the KEV catalog or Hot List, exploit code is publicly available via ExploitDB, and its high FAUCET Risk Score of 98/100 indicates significant potential for exploitation, despite a lack of recent community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
3.0CPE matchmatch criteria
cpe:2.3:a:microsoft:internet_information_server:3.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

6.4MEDIUM

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

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
4.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
53.30%
Probability of exploitation in next 30 days
EPSS Percentile
98.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
ExploitDB: EDB-20309 · Aug 25, 1997
This CVE's current EPSS score of 0.5330 is in the 99th percentile among its peer group of 23,725 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 0.4 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

osvdb.org / 275