CVE-2021-28480
CriticalMicrosoft Exchange Server Remote Code Execution Vulnerability
Published Apr 14, 2021 · Updated Aug 3, 2024 · Also known as TR-21-0320
Key Facts
Patch immediately- CVE-2021-28480 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Exchange Server (Microsoft).
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 71% 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 very likely to be exploited soon.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
71%
Higher than 99.4% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
None known
Get the full CVE-2021-28480 brief as a PDF
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Description
Microsoft Exchange Server Remote Code Execution Vulnerability
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
Last updated
Aug 3, 2024
References
- advisoryhttps://support.microsoft.com/en-us/topic/description-of-the-security-update-for-microsoft-exchange-server-2019-2016-and-2013-april-13-2021-kb5001779-8e08f3b3-fc7b-466c-bbb7-5d5aa16ef064
- advisoryUSOM advisory
- patchhttps://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-28480
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 not listed in any known-exploited vulnerabilities catalog.
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 very likely to be exploited soon.
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