Microsoft Exchange 5.5 MIME Header charset denial of service

CVSS Meta Temp Score
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CTI Interest Score
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4.8$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in Microsoft Exchange 5.5. Affected by this vulnerability is an unknown functionality of the component MIME Header Handler. This manipulation of the argument charset causes denial of service. This vulnerability is tracked as CVE-2000-1006. Moreover, an exploit is present. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Microsoft Exchange 5.5 (Groupware Software). It has been declared as problematic. Affected by this vulnerability is an unknown code of the component MIME Header Handler. The manipulation of the argument charset with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. The summary by CVE is:

Microsoft Exchange Server 5.5 does not properly handle a MIME header with a blank charset specified, which allows remote attackers to cause a denial of service via a charset="" command, aka the "Malformed MIME Header" vulnerability.

The weakness was disclosed 12/11/2000 with Microsoft (Website). It is possible to read the advisory at xforce.iss.net. This vulnerability is known as CVE-2000-1006. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details and also a public exploit are known.

It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 10558 (Exchange Malformed MIME Header Handling DoS), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SMTP problems and running in the context r. The commercial vulnerability scanner Qualys is able to test this issue with plugin 74055 (Microsoft Exchange Server Invalid MIME Header).

Upgrading eliminates this vulnerability. Attack attempts may be identified with Snort ID 658. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 1140.

The vulnerability is also documented in the databases at X-Force (5448), Tenable (10558), SecurityFocus (BID 1869†) and Vulnerability Center (SBV-287†). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 4.8

VulDB Base Score: 5.3
VulDB Temp Score: 4.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 10558
Nessus Name: Exchange Malformed MIME Header Handling DoS
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍
Snort ID: 658
Snort Message: SERVER-MAIL Microsoft Windows Exchange Server 5.5 mime DOS
Snort Class: 🔍
TippingPoint: 🔍
SourceFire IPS: 🔍
ISS Proventia IPS: 🔍

Timelineinfo

10/31/2000 🔍
11/27/2000 +27 days 🔍
12/11/2000 +14 days 🔍
12/11/2000 +0 days 🔍
12/11/2000 +0 days 🔍
12/08/2002 +727 days 🔍
06/30/2014 +4222 days 🔍
10/12/2025 +4121 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: xforce.iss.net
Organization: Microsoft
Status: Confirmed

CVE: CVE-2000-1006 (🔍)
GCVE (CVE): GCVE-0-2000-1006
GCVE (VulDB): GCVE-100-16027
X-Force: 5448
SecurityFocus: 1869 - Microsoft Exchange Server Invalid MIME Header charset = "" DoS Vulnerability
Vulnerability Center: 287 - [MS00-082] DoS in Microsoft Exchange Server 5.5 via Malformed MIME Header, High

scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 06/30/2014 16:25
Updated: 10/12/2025 00:30
Changes: 06/30/2014 16:25 (72), 05/06/2019 06:58 (3), 10/12/2025 00:30 (20)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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