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CVE-2021-34523Microsoft Exchange Server Elevation of Privilege Vulnerability
Microsoft Exchange Server Elevation of Privilege Vulnerability
9.8 CRITICALEPSS 99.99%⚡ Known Exploited (CISA KEV)NVD: Analyzed
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 9.8 | CRITICAL | 3.1NVD | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 9.0 | CRITICAL | 3.1microsoft (CNA) | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N |
| 9.0 | CRITICAL | 3.1microsoft (CNA) | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C |
| 7.5 | HIGH | 2.0NVD | AV:N/AC:L/Au:N/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-2021-34523
- Status
- Analyzed
- Assigner (CNA)
- microsoft
- Published
- Jul 14, 2021
- Last modified
- 2026-08-10 19:59 UTC
- Weaknesses
Affected Products
As published by the CNA in the CVE record.
MicrosoftMicrosoft Exchange Server 2013 Cumulative Update 231 version range
- 15.00.0 before 15.00.1497.015
MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 191 version range
- 15.01.0 before 15.01.2176.012
MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 201 version range
- 15.01.0 before 15.01.2242.008
MicrosoftMicrosoft Exchange Server 2019 Cumulative Update 81 version range
- 15.02.0 before 15.02.0792.013
MicrosoftMicrosoft Exchange Server 2019 Cumulative Update 91 version range
- 15.02.0 before 15.02.0858.010
References
- msrc.microsoft.com https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34523
- 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-2021-34523
- zerodayinitiative.com https://www.zerodayinitiative.com/advisories/ZDI-21-822/
- cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-34523