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CVE-2021-31207Microsoft Exchange Server Security Feature Bypass Vulnerability
Microsoft Exchange Server Security Feature Bypass Vulnerability
6.6 MEDIUMEPSS 99.78%⚡ Known Exploited (CISA KEV)NVD: Analyzed
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 6.6 | MEDIUM | 3.1microsoft (CNA) | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H |
| 6.6 | MEDIUM | 3.1microsoft (CNA) | 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 |
| 6.5 | MEDIUM | 2.0NVD | AV:N/AC:L/Au:S/C:P/I:P/A:P |
CISA required action
⚡ Known exploited · remediation due Nov 17, 2021
Apply updates per vendor instructions.
Details
- CVE ID
- CVE-2021-31207
- Status
- Analyzed
- Assigner (CNA)
- microsoft
- Published
- May 11, 2021
- Last modified
- 2026-06-17 03:51 UTC
Affected Products
As published by the CNA in the CVE record.
MicrosoftMicrosoft Exchange Server 2013 Cumulative Update 231 version range
- 15.00.0 before 15.00.1497.018
MicrosoftMicrosoft Exchange Server 2019 Cumulative Update 91 version range
- 15.02.0 before 15.02.0858.012
MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 201 version range
- 15.01.0 before 15.01.2242.010
MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 191 version range
- 15.01.0 before 15.01.2176.014
MicrosoftMicrosoft Exchange Server 2019 Cumulative Update 81 version range
- 15.02.0 before 15.02.0792.015
References
- packetstormsecurity.com http://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.html
- portal.msrc.microsoft.com https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31207
- zerodayinitiative.com https://www.zerodayinitiative.com/advisories/ZDI-21-819/
- cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-31207