CVEvulnerability

CVE-2021-34473

9.1 CRITICAL Known exploited Published 2021-07-14 Modified 2026-08-10 Official page ↗

CISA Known Exploited Vulnerability

Microsoft Exchange Server Remote Code Execution Vulnerability — Microsoft Exchange Server

Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution.

Added to KEV
2021-11-03
Remediation due
2021-11-17
Ransomware use
Known
Required action
Apply updates per vendor instructions.
Notes
https://nvd.nist.gov/vuln/detail/CVE-2021-34473
Status
Analyzed
Published
2021-07-14
Last modified
2026-08-10
Assigner
[email protected]
CVSS 3.1 ([email protected])
9.1 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS 3.1 ([email protected])
9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0 ([email protected])
10.0 HIGH — AV:N/AC:L/Au:N/C:C/I:C/A:C
Weaknesses
CWE-918

Description

Microsoft Exchange Server Remote Code Execution Vulnerability

Affected configurations

• microsoft exchange server 2013 • microsoft exchange server 2016 • microsoft exchange server 2019

Related

Weakness · CWE (1)

  • CWE-918 Server-Side Request Forgery weakness

References