Cyber Resilience

CVE-2020-17143

Microsoft Exchange Server 2013 … 2019

High EPSS
Published
10 December 2020
Modified
28 August 2025
Patch / advisory
View advisory
CVSS Score v3.1 8.8
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.71 99.3th percentile
Risk Priority 87 floored blend · peak EPSS

Summary

CVE-2020-17143 is a high-severity an unspecified weakness vulnerability in Microsoft Exchange Server. Its CVSS base score is 8.8 (High).

Operationally, ranked in the top 0.7% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability Data

Microsoft Exchange Server Information Disclosure Vulnerability

CWE(s)
NVD-CWE-noinfo

Related Threats

Likely ATT&CK TechniquesAI

Techniques this vulnerability likely enables, inferred from its description, weakness type, and attributed-actor tradecraft. Confidence is per-technique.

T1087.003 Email Account Discoveryconfidence: HIGH
Information disclosure in Exchange can expose email account details.
attack.mitre.org →
T1213.005 Messaging Applications Collectionconfidence: HIGH
The vulnerability directly enables unauthorized access to data in the messaging application.
attack.mitre.org →
inferred from description · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

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CVE-2021-28480Same product: Microsoft Exchange Server
CVE-2023-36777Same product: Microsoft Exchange Server
CVE-2023-21764Same product: Microsoft Exchange Server
CVE-2023-21710Same product: Microsoft Exchange Server
CVE-2023-38181Same product: Microsoft Exchange Server
CVE-2023-21761Same product: Microsoft Exchange Server
CVE-2021-26855Same product: Microsoft Exchange Server

Affected Assets

microsoft
exchange server
2013, 2016, 2019

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References