Which products and versions are affected by CVE-1999-1011?

Affected: Data Access Components (Microsoft) versions 1.5, 2.0, 2.1; Index Server (Microsoft) versions 2.0; Internet Information Server (Microsoft) versions 3.0, 4.0, among others. The full list is in the CVE brief.

Is CVE-1999-1011 being exploited in the wild?

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

Is CVE-1999-1011 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-1999-1011?

Public exploit code is available.

Is there a fix for CVE-1999-1011?

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

How urgently should CVE-1999-1011 be patched?

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

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Vulnerability Intelligence

CVE-1999-1011

CriticalPublic exploit

The Remote Data Service (RDS) DataFactory component of Microsoft Data Access Components (MDAC) in IIS 3.x and 4.x exposes unsafe methods, which allows remote attackers to execute arbitrary commands.

Published Jul 19, 1999 · Updated Apr 15, 2026

Key Facts

Patch immediately

CVE-1999-1011 is a critical-severity vulnerability (CVSS 10.0 v2) affecting Data Access Components (Microsoft), Index Server (Microsoft), Internet Information Server (Microsoft) and 1 more product.
It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
EPSS estimates a 77% 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

10.0

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

EPSS (30-day exploit likelihood)

77%

Higher than 99.5% 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-1999-1011 brief as a PDF

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

Description

The Remote Data Service (RDS) DataFactory component of Microsoft Data Access Components (MDAC) in IIS 3.x and 4.x exposes unsafe methods, which allows remote attackers to execute arbitrary commands.

Affected Products

7 affected entries in total

Product	Affected versions	Fixed in
Data Access ComponentsMicrosoft	1.5, 2.0, 2.1	n/a
Index ServerMicrosoft	2.0	n/a
Internet Information ServerMicrosoft	3.0, 4.0	n/a
Site ServerMicrosoft	3.0	n/a

Timeline

Publicly disclosed
Jul 19, 1999
Last updated
Apr 15, 2026

Weakness Type

CWE-264

References

3 more references in the full CVE brief

FAQ

Common Questions.

The Remote Data Service (RDS) DataFactory component of Microsoft Data Access Components (MDAC) in IIS 3.x and 4.x exposes unsafe methods, which allows remote attackers to execute arbitrary commands.
Affected: Data Access Components (Microsoft) versions 1.5, 2.0, 2.1; Index Server (Microsoft) versions 2.0; Internet Information Server (Microsoft) versions 3.0, 4.0, among others. 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-1999-1011 Running On Your Attack Surface?

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