Which products and versions are affected by CVE-2020-17144?

Affected: Exchange Server (Microsoft) versions 2010-sp3_rollup_31; Microsoft Exchange Server 2010 Service Pack 3 Update Rollup 31. The full list is in the CVE brief.

Is CVE-2020-17144 being exploited in the wild?

It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Nov 3, 2021.

Is CVE-2020-17144 in the CISA KEV catalog?

Yes. It was added on Nov 3, 2021 with a federal remediation due date of May 3, 2022.

Is there a public exploit for CVE-2020-17144?

Public exploit code is available.

Is there a fix for CVE-2020-17144?

Fixed versions are available, including Microsoft Exchange Server 2010 Service Pack 3 Update Rollup 31 publication.

How urgently should CVE-2020-17144 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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Vulnerability Intelligence

CVE-2020-17144

HighExploitedPublic exploit

Microsoft Exchange Remote Code Execution Vulnerability

Published Dec 9, 2020 · Updated Jun 9, 2026

Key Facts

Patch immediately

CVE-2020-17144 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Exchange Server (Microsoft), Microsoft Exchange Server 2010 Service Pack 3 Update Rollup 31.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Nov 3, 2021. Public exploit code is available.
EPSS estimates a 37% probability of exploitation in the next 30 days.
Fixed versions are available, including Microsoft Exchange Server 2010 Service Pack 3 Update Rollup 31 publication.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

8.8

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS (30-day exploit likelihood)

37%

Higher than 98.4% of all scored CVEs

Exploited in the wild

Yes

4 catalog listings

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2020-17144 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

Microsoft Exchange Remote Code Execution Vulnerability

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
CISA KEV	Nov 3, 2021	May 3, 2022	Not reported
Industry KEV feed	Nov 3, 2021	May 3, 2022	Not reported
CIRCL KEV	Nov 3, 2021	May 3, 2022	Not reported
ENISA EUVD	Nov 3, 2021	n/a	Not reported

Required action: Apply updates per vendor instructions.

Affected Products

2 affected entries in total

Product	Affected versions	Fixed in
Exchange ServerMicrosoft	2010-sp3_rollup_31	n/a
Microsoft Exchange Server 2010 Service Pack 3 Update Rollup 31	See advisory	publication

Patched Releases

Microsoft Exchange Server 2010 Service Pack 3 Update Rollup 31

publication

Timeline

Publicly disclosed
Dec 9, 2020
Added to CISA KEV
Nov 3, 2021
Added to Industry KEV feed
Nov 3, 2021
Added to CIRCL KEV
Nov 3, 2021
Added to ENISA EUVD
Nov 3, 2021
Last updated
Jun 9, 2026

Weakness Type

CWE-502 Deserialization of Untrusted Data

References

10 more references in the full CVE brief

FAQ

Common Questions.

Microsoft Exchange Remote Code Execution Vulnerability
Affected: Exchange Server (Microsoft) versions 2010-sp3_rollup_31; Microsoft Exchange Server 2010 Service Pack 3 Update Rollup 31. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Nov 3, 2021.
Yes. It was added on Nov 3, 2021 with a federal remediation due date of May 3, 2022.
Public exploit code is available.
Fixed versions are available, including Microsoft Exchange Server 2010 Service Pack 3 Update Rollup 31 publication.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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