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CVE-2021-26855Microsoft Exchange Server Remote Code Execution Vulnerability

Microsoft Exchange Server Remote Code Execution Vulnerability

9.8 CRITICALEPSS 99.99%⚡ Known Exploited (CISA KEV)NVD: Analyzed

OverviewAffected ProductsReferences
NVD CVE.org

Overview

Severity

ScoreSeverityVersionVector String
9.8CRITICAL3.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.1CRITICAL3.1microsoft (CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
9.1CRITICAL3.1microsoft (CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:F/RL:O/RC:C
7.5HIGH2.0NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

CISA required action

⚡ Known exploited · remediation due May 3, 2022

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Details

CVE ID
CVE-2021-26855
Status
Analyzed
Assigner (CNA)
microsoft
Published
Mar 3, 2021
Last modified
2026-08-19 19:22 UTC
Weaknesses

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 09:51 UTC.