Which products and versions are affected by CVE-1999-0191?

Affected: Internet Information Server (Microsoft) versions 3.0. The full list is in the CVE brief.

Is CVE-1999-0191 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-1999-0191 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-1999-0191?

Public exploit code is available.

Is there a fix for CVE-1999-0191?

No fixed version is listed yet; check the vendor advisory for mitigations.

How urgently should CVE-1999-0191 be patched?

Brandefense priority: patch immediately, because it is very likely to be exploited soon.

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Vulnerability Intelligence

CVE-1999-0191

MediumPublic exploit

IIS newdsn.exe CGI script allows remote users to overwrite files.

Published Sep 1, 1997 · Updated Apr 15, 2026

Key Facts

Patch immediately

CVE-1999-0191 is a medium-severity vulnerability (CVSS 6.4 v2) affecting Internet Information Server (Microsoft).
It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
EPSS estimates a 53% probability of exploitation in the next 30 days.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

CVSS v2

6.4

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

EPSS (30-day exploit likelihood)

53%

Higher than 98.9% of all scored CVEs

Exploited in the wild

No known

Not in a known-exploited catalog

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-1999-0191 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

IIS newdsn.exe CGI script allows remote users to overwrite files.

Affected Products

1 affected entries in total

Product	Affected versions	Fixed in
Internet Information ServerMicrosoft	3.0	n/a

Timeline

Publicly disclosed
Sep 1, 1997
Last updated
Apr 15, 2026

References

exploitExploitDB-20309
other275

FAQ

Common Questions.

IIS newdsn.exe CGI script allows remote users to overwrite files.
Affected: Internet Information Server (Microsoft) versions 3.0. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

Is CVE-1999-0191 Running On Your Attack Surface?

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