CVEvulnerability

CVE-2023-21529

8.8 HIGH Known exploited Published 2023-02-14 Modified 2026-08-19 Official page ↗

CISA Known Exploited Vulnerability

Microsoft Exchange Server Deserialization of Untrusted Data Vulnerability — Microsoft Exchange Server

Microsoft Exchange Server contains a deserialization of untrusted data that allows an authenticated attacker to achieve remote code execution.

Added to KEV
2026-04-13
Remediation due
2026-04-27
Ransomware use
Known
Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Notes
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21529 ; https://nvd.nist.gov/vuln/detail/CVE-2023-21529
Status
Analyzed
Published
2023-02-14
Last modified
2026-08-19
Assigner
[email protected]
CVSS 3.1 ([email protected])
8.8 HIGH — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-502

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-502 Deserialization of Untrusted Data weakness

References