Which products and versions are affected by CVE-2000-0649?

Affected: Internet Information Server (Microsoft) versions 3.0, 4.0; Internet Information Services (Microsoft) versions 2.0, 5.0. The full list is in the CVE brief.

Is CVE-2000-0649 being exploited in the wild?

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

Is CVE-2000-0649 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-2000-0649?

Public exploit code is available.

Is there a fix for CVE-2000-0649?

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

How urgently should CVE-2000-0649 be patched?

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

Request A Demo

Vulnerability Intelligence

CVE-2000-0649

LowPublic exploit

IIS 4.0 allows remote attackers to obtain the internal IP address of the server via an HTTP 1.0 request for a web page which is protected by basic authentication and has no realm defined.

Published Jul 13, 2000 · Updated Apr 15, 2026

Key Facts

Patch immediately

CVE-2000-0649 is a low-severity vulnerability (CVSS 2.6 v2) affecting Internet Information Server (Microsoft), Internet Information Services (Microsoft).
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

2.6

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

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-2000-0649 brief as a PDF

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

Description

IIS 4.0 allows remote attackers to obtain the internal IP address of the server via an HTTP 1.0 request for a web page which is protected by basic authentication and has no realm defined.

Affected Products

4 affected entries in total

Product	Affected versions	Fixed in
Internet Information ServerMicrosoft	3.0, 4.0	n/a
Internet Information ServicesMicrosoft	2.0, 5.0	n/a

Timeline

Publicly disclosed
Jul 13, 2000
Last updated
Apr 15, 2026

Weakness Type

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References

patch20000713 IIS4 Basic authentication realm issue
patch1499
exploitExploitDB-20096

FAQ

Common Questions.

IIS 4.0 allows remote attackers to obtain the internal IP address of the server via an HTTP 1.0 request for a web page which is protected by basic authentication and has no realm defined.
Affected: Internet Information Server (Microsoft) versions 3.0, 4.0; Internet Information Services (Microsoft) versions 2.0, 5.0. 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-2000-0649 Running On Your Attack Surface?

Brandefense maps vulnerabilities like this one to your internet-facing assets and tells you exactly where to patch.