Vulnerabilities CVE-2021-26857

CVE-2021-26857

High

Open

KEV

TLP:CLEAR

Microsoft Exchange Server Remote Code Execution Vulnerability

NVD CVE.org

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Description

Microsoft — Exchange Server — Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution. This vulnerability is part of the ProxyLogon exploit chain.

Details

CVSS Score: 7.8
EPSS Score ⓘ: 94.01%

99.8th percentile
CVSS Vector: 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
Confidence: 100%
Published: Mar 2, 2021
Last Modified: Aug 12, 2026
CISA KEV
Date Added: Nov 3, 2021
Patch Due: May 3, 2022
Required Action: Apply updates per vendor instructions.

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