Which products and versions are affected by CVE-2021-28482?

Affected: Exchange Server (Microsoft) versions 2013-cumulative_update_23, 2016-cumulative_update_19, 2016-cumulative_update_20, 2019-cumulative_update_8, 2019-cumulative_update_9. The full list is in the CVE brief.

Is CVE-2021-28482 being exploited in the wild?

It is exploited in the wild, listed in Industry KEV feed since Aug 17, 2021 and is known to be used in ransomware campaigns.

Is CVE-2021-28482 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2021-28482?

No public exploit code is known.

Is there a fix for CVE-2021-28482?

Fixed versions are available, including Exchange Server 15.00.1497.015, Exchange Server 15.01.2176.012, Exchange Server 15.01.2242.008.

How urgently should CVE-2021-28482 be patched?

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

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Vulnerability Intelligence

CVE-2021-28482

HighExploited

Microsoft Exchange Server Remote Code Execution Vulnerability

Published Apr 14, 2021 · Updated Aug 3, 2024

Key Facts

Patch immediately

CVE-2021-28482 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Exchange Server (Microsoft).
It is exploited in the wild, listed in Industry KEV feed since Aug 17, 2021 and is known to be used in ransomware campaigns. No public exploit code is known.
EPSS estimates a 83% probability of exploitation in the next 30 days.
Fixed versions are available, including Exchange Server 15.00.1497.015, Exchange Server 15.01.2176.012, Exchange Server 15.01.2242.008.
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)

83%

Higher than 99.6% of all scored CVEs

Exploited in the wild

Yes

1 catalog listing, used by ransomware

Public exploit code

None known

Get the full CVE-2021-28482 brief as a PDF

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Description

Microsoft Exchange Server Remote Code Execution Vulnerability

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
Industry KEV feed	Aug 17, 2021	n/a	Known

Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

Affected Products

5 affected entries in total

Product	Affected versions	Fixed in
Exchange ServerMicrosoft	2013-cumulative_update_23, 2016-cumulative_update_19, 2016-cumulative_update_20, 2019-cumulative_update_8, 2019-cumulative_update_9	15.00.1497.015

Patched Releases

Exchange Server

15.00.1497.015, 15.01.2176.012, 15.01.2242.008, 15.02.0792.013, 15.02.0858.010

Timeline

Publicly disclosed
Apr 14, 2021
Added to Industry KEV feed
Aug 17, 2021
Last updated
Aug 3, 2024

References

FAQ

Common Questions.

Microsoft Exchange Server Remote Code Execution Vulnerability
Affected: Exchange Server (Microsoft) versions 2013-cumulative_update_23, 2016-cumulative_update_19, 2016-cumulative_update_20, 2019-cumulative_update_8, 2019-cumulative_update_9. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Aug 17, 2021 and is known to be used in ransomware campaigns.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Exchange Server 15.00.1497.015, Exchange Server 15.01.2176.012, Exchange Server 15.01.2242.008.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

Is CVE-2021-28482 Running On Your Attack Surface?

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