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CVE-2021-42321Microsoft Exchange Server Remote Code Execution Vulnerability
Microsoft Exchange Server Remote Code Execution Vulnerability
8.8 HIGHEPSS 91.73%⚡ Known Exploited (CISA KEV)NVD: Analyzed
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 8.8 | HIGH | 3.1microsoft (CNA) | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 8.8 | HIGH | 3.1microsoft (CNA) | CVSS:3.1/AV:N/AC:L/PR:L/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 Dec 1, 2021
Apply updates per vendor instructions.
Details
- CVE ID
- CVE-2021-42321
- Status
- Analyzed
- Assigner (CNA)
- microsoft
- Published
- Nov 10, 2021
- Last modified
- 2026-08-19 19:23 UTC
Affected Products
As published by the CNA in the CVE record.
MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 211 version range
- 15.01.0 before 15.01.2308.020
MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 221 version range
- 15.0.0 before 15.01.2375.017
MicrosoftMicrosoft Exchange Server 2019 Cumulative Update 101 version range
- 15.02.0 before 15.02.0792.019
MicrosoftMicrosoft Exchange Server 2019 Cumulative Update 111 version range
- 15.02.0 before 15.02.0986.014
References
- msrc.microsoft.com https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-42321
- packetstormsecurity.com http://packetstormsecurity.com/files/166153/Microsoft-Exchange-Server-Remote-Code-Execution.html
- packetstormsecurity.com http://packetstormsecurity.com/files/168131/Microsoft-Exchange-Server-ChainedSerializationBinder-Remote-Code-Execution.html
- portal.msrc.microsoft.com https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42321
- cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-42321