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Vulnerability record · CVE-2002-0054 · published 8 March 2002

CVE-2002-0054: Microsoft exchange server authentication bypass by capture-replay vulnerability

Microsoft · Exchange Server

SMTP service in (1) Microsoft Windows 2000 and (2) Internet Mail Connector (IMC) in Exchange Server 5.5 does not properly handle responses to NTLM authentication, which allows remote attackers to perform mail relaying via an SMTP AUTH command using null session credentials.

7.5 CVSS 2.0 High EPSS 22% · top 2.4% CWE-294 · Authentication bypass by capture-replay
7.5CVSS 2.0 base score
22%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References
16 Jun 2026Last modified by NVD

Description

SMTP service in (1) Microsoft Windows 2000 and (2) Internet Mail Connector (IMC) in Exchange Server 5.5 does not properly handle responses to NTLM authentication, which allows remote attackers to perform mail relaying via an SMTP AUTH command using null session credentials.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://marc.info/?l=bugtraq&m=101501580409373&w=2 Mailing ListThird Party Advisory
http://www.securityfocus.com/bid/4205 PatchThird Party AdvisoryVDB Entry
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2002/ms02-011 PatchVendor Advisory
http://marc.info/?l=bugtraq&m=101501580409373&w=2 Mailing ListThird Party Advisory
http://www.securityfocus.com/bid/4205 PatchThird Party AdvisoryVDB Entry
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2002/ms02-011 PatchVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2002-0054), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.