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Vulnerability record · CVE-2001-0660 · published 30 October 2001

CVE-2001-0660: Microsoft exchange server vulnerability

Microsoft · Exchange Server

Outlook Web Access (OWA) in Microsoft Exchange 5.5, SP4 and earlier, allows remote attackers to identify valid user email addresses by directly accessing a back-end function that processes the global address list (GAL).

5.0 CVSS 2.0 Medium EPSS 22% · top 2.4%
5.0CVSS 2.0 base score
22%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
16 Jun 2026Last modified by NVD

Description

Outlook Web Access (OWA) in Microsoft Exchange 5.5, SP4 and earlier, allows remote attackers to identify valid user email addresses by directly accessing a back-end function that processes the global address list (GAL).

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

Affected products

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

References

LinkTags
http://support.microsoft.com/support/kb/articles/Q307/1/95.ASP PatchVendor Advisory
http://www.securityfocus.com/bid/3301
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2001/ms01-047
https://exchange.xforce.ibmcloud.com/vulnerabilities/7089
http://support.microsoft.com/support/kb/articles/Q307/1/95.ASP PatchVendor Advisory
http://www.securityfocus.com/bid/3301
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2001/ms01-047
https://exchange.xforce.ibmcloud.com/vulnerabilities/7089

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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-2001-0660), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.