CVE-2021-31195 in the critical feed json
Microsoft Exchange Server Remote Code Execution Vulnerability
published 5y ago modified 4mo ago also EUVD-2021-18108
- cvss
- 8.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 73.7%
- EPSS 73.7% chance of exploitation in 30 days, percentile 99.4%
- public exploits
- 0
- none known, plus a Nuclei check
Summary
Microsoft Exchange Server Remote Code Execution Vulnerability
Patch / fix
- Microsoft Microsoft Exchange Server 2016 Cumulative Update 19 15.01.2176.014
- Microsoft Microsoft Exchange Server 2019 Cumulative Update 8 15.02.0792.015
- Microsoft Microsoft Exchange Server 2019 Cumulative Update 9 15.02.0858.012
- Microsoft Microsoft Exchange Server 2016 Cumulative Update 20 15.01.2242.010
- Microsoft Microsoft Exchange Server 2013 Cumulative Update 23 15.00.1497.018
Is CVE-2021-31195 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- last yr.
Exploit prediction
73.68% chance of exploitation in the next 30 days, higher than 99.4% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- Nuclei template Microsoft Exchange Server - Cross-Site Scripting nuclei detection template
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C |
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N |
| CNA | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.8 | AV:N/AC:M/Au:N/C:P/I:P/A:P |
Affected products
- Microsoft Microsoft Exchange Server 2016 Cumulative Update 19
- Microsoft Microsoft Exchange Server 2019 Cumulative Update 8
- Microsoft Microsoft Exchange Server 2019 Cumulative Update 9
- Microsoft Microsoft Exchange Server 2016 Cumulative Update 20
- Microsoft Microsoft Exchange Server 2013 Cumulative Update 23
Classification
- Weakness
-
- CWE-290 Authentication Bypass by Spoofing
- Technology feeds
References
-
portal.msrc.microsoft.com
/en-US/security-guidance/advisory/CVE-2021-31195
patch, vendor-advisory
Sources
- CVE List CVE-2021-31195
- NVD CVE-2021-31195
Fencer Intel 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.