CVE-2021-31207
Microsoft Exchange Server Security Feature Bypass Vulnerability
- State
- Published
- Severity
- 6.6 Medium
- Published
- May 11, 2021
- Updated
- Oct 21, 2025
- Reserved
- Apr 14, 2021
Description
Microsoft Exchange Server Security Feature Bypass Vulnerability
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 6.6 Medium | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C | microsoft |
Weaknesses
- CWE-434 Unrestricted Upload of File with Dangerous Type
Affected Products
| Product | Versions |
|---|---|
Microsoft Exchange Server 2013 Cumulative Update 23Microsoft |
|
Microsoft Exchange Server 2019 Cumulative Update 9Microsoft |
|
Microsoft Exchange Server 2016 Cumulative Update 20Microsoft |
|
Microsoft Exchange Server 2016 Cumulative Update 19Microsoft |
|
Microsoft Exchange Server 2019 Cumulative Update 8Microsoft |
|
References
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31207
- https://www.zerodayinitiative.com/advisories/ZDI-21-819/
- http://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.html
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-31207government-resource
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