CVE-2021-27078 in the critical feed json
Microsoft Exchange Server Remote Code Execution Vulnerability
published 2021-03-02 5 y ago modified 2026-08-19 2 mo ago also EUVD-2021-13849
- cvss
- 9.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 21.6%
- EPSS 21.6% chance of exploitation in 30 days, percentile 97%
- public exploits
- 0
- none known
Summary
Microsoft Exchange Server Remote Code Execution Vulnerability
Patch / fix
- Microsoft Microsoft Exchange Server 2013 Cumulative Update 23 15.00.1497.012
- Microsoft Microsoft Exchange Server 2016 Cumulative Update 18 15.01.2106.013
- Microsoft Microsoft Exchange Server 2016 Cumulative Update 19 15.01.2176.009
- Microsoft Microsoft Exchange Server 2019 Cumulative Update 7 15.02.0721.013
- Microsoft Microsoft Exchange Server 2019 Cumulative Update 8 15.02.0792.010
Exploit prediction
21.59% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.1 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C |
| CNA | 3.1 | 9.1 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H |
| CNA | 3.1 | 7.2 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.5 | AV:N/AC:L/Au:S/C:P/I:P/A:P |
Affected products
- Microsoft Microsoft Exchange Server 2013 Cumulative Update 23
- Microsoft Microsoft Exchange Server 2016 Cumulative Update 18
- Microsoft Microsoft Exchange Server 2016 Cumulative Update 19
- Microsoft Microsoft Exchange Server 2019 Cumulative Update 7
- Microsoft Microsoft Exchange Server 2019 Cumulative Update 8
Classification
- Technology feeds
References
-
msrc.microsoft.com
/update-guide/vulnerability/CVE-2021-27078
vendor-advisory, patch
-
portal.msrc.microsoft.com
/en-US/security-guidance/advisory/CVE-2021-27078
patch, vendor-advisory
Sources
- CVE List CVE-2021-27078
- NVD CVE-2021-27078
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.