Is CVE-2001-0660 in the CISA KEV catalog?

No. CVE-2001-0660 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2001-0660?

CVE-2001-0660 has a CVSS v2 base score of 5.0 (MEDIUM).

What is the EPSS score for CVE-2001-0660?

CVE-2001-0660 has an EPSS score of 18.13% (97th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2001-0660

MEDIUMEPSS 97th pctl

5.0

CVSS v2

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).

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

18.13%probability of exploitation in 30 days

97thpercentile

Very high risk: more likely to be exploited than 97% of all known CVEs.

References

http://support.microsoft.com/support/kb/articles/Q307/1/95.ASP
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

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-16.