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CVE-1999-1233

21
FAUCET Score

CVE-1999-1233 describes a "Domain Resolution" vulnerability in Microsoft IIS 4.0, where the server fails to properly restrict initial session requests from IP addresses that do not resolve to a DNS domain. This vulnerability is rated as HIGH severity with a CVSS score of 7.5, indicating it can be exploited remotely with low complexity to achieve partial confidentiality, integrity, and availability impacts. Despite its age, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
4.0CPE matchmatch criteria
cpe:2.3:a:microsoft:internet_information_server:4.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.5HIGH

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

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
6.4
CvssVersion
2.0

Exploit Intelligence

EPSS Score
5.45%
Probability of exploitation in next 30 days
EPSS Percentile
91.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0545 is in the 86th percentile among its peer group of 51,553 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, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 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/ms99-039
exchange.xforce.ibmcloud.com / vulnerabilities/3306
support.microsoft.com / support/kb/articles/Q241/5/62.asp
PatchVendor Advisory
securityfocus.com / bid/657
ExploitPatchVendor Advisory