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CVE-2021-26858Microsoft Exchange Server Remote Code Execution Vulnerability
Microsoft Exchange Server Remote Code Execution Vulnerability
7.8 HIGHEPSS 93.65%⚡ Known Exploited (CISA KEV)NVD: Analyzed
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 7.8 | HIGH | 3.1microsoft (CNA) | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| 7.8 | HIGH | 3.1microsoft (CNA) | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C |
| 6.8 | MEDIUM | 2.0NVD | AV:N/AC:M/Au:N/C:P/I:P/A:P |
CISA required action
⚡ Known exploited · remediation due May 3, 2022
Apply updates per vendor instructions.
Details
- CVE ID
- CVE-2021-26858
- Status
- Analyzed
- Assigner (CNA)
- microsoft
- Published
- Mar 3, 2021
- Last modified
- 2026-10-01 21:17 UTC
Affected Products
As published by the CNA in the CVE record.
MicrosoftMicrosoft Exchange Server 2013 Cumulative Update 211 version range
- 15.00.0 before 15.00.1395.012
MicrosoftMicrosoft Exchange Server 2013 Cumulative Update 221 version range
- 15.00.0 before 15.00.1473.006
MicrosoftMicrosoft Exchange Server 2013 Cumulative Update 231 version range
- 15.00.0 before 15.00.1497.012
MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 101 version range
- 15.01.0 before 15.01.1531.012
MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 111 version range
- 15.01.0 before 15.01.1591.018
MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 121 version range
- 15.01.0 before 15.01.1713.010
MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 131 version range
- 15.01.0 before 15.01.1779.008
MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 141 version range
- 15.01.0 before 15.01.1847.012
MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 151 version range
- 15.01.0 before 15.01.1913.012
MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 161 version range
- 15.01.0 before 15.01.1979.008
MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 171 version range
- 15.01.0 before 15.01.2044.013
MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 181 version range
- 15.01.0 before 15.01.2106.013
MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 191 version range
- 15.01.0 before 15.01.2176.009
MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 81 version range
- 15.01.0 before 15.01.1415.010
MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 91 version range
- 15.01.0 before 15.01.1466.016
MicrosoftMicrosoft Exchange Server 20191 version range
- 15.02.0 before 15.02.0221.018
MicrosoftMicrosoft Exchange Server 2019 Cumulative Update 11 version range
- 15.02.0 before 15.01.1979.006
MicrosoftMicrosoft Exchange Server 2019 Cumulative Update 21 version range
- 15.02.0 before 15.02.0397.011
MicrosoftMicrosoft Exchange Server 2019 Cumulative Update 31 version range
- 15.02.0 before 15.02.0464.015
MicrosoftMicrosoft Exchange Server 2019 Cumulative Update 41 version range
- 15.02.0 before 15.02.0659.012
MicrosoftMicrosoft Exchange Server 2019 Cumulative Update 51 version range
- 15.02.0 before 15.02.0595.008
MicrosoftMicrosoft Exchange Server 2019 Cumulative Update 61 version range
- 15.02.0 before 15.02.0529.013
MicrosoftMicrosoft Exchange Server 2019 Cumulative Update 71 version range
- 15.02.0 before 15.02.0721.013
MicrosoftMicrosoft Exchange Server 2019 Cumulative Update 81 version range
- 15.02.0 before 15.02.0792.010