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CVE-2023-21529: Microsoft Exchange Server

EPSS59.2%No. 807 of 1739 in KEV
CVE year2023~3 yrs before listing
Same vendor in KEV389
Same product17
FieldValue
VendorMicrosoft
ProductExchange Server
NameMicrosoft Exchange Server Deserialization of Untrusted Data Vulnerability
Added to KEV2026-04-13
US federal due date2026-04-27
Ransomware useKnown
CWECWE-502

CISA description

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

Other entries for this product

CVEVendor / productAddedEPSSRansomware
CVE-2021-31196Microsoft Exchange Server2024-08-2154.0%Unknown
CVE-2024-21410Microsoft Exchange Server2024-02-1512.5%Unknown
CVE-2022-41080Microsoft Exchange Server2023-01-1077.3%Known
CVE-2022-41082Microsoft Exchange Server2022-09-3099.9%Known
CVE-2022-41040Microsoft Exchange Server2022-09-3099.9%Known
CVE-2018-8581Microsoft Exchange Server2022-03-0327.3%Known
CVE-2021-33766Microsoft Exchange Server2022-01-1898.1%Unknown
CVE-2021-34523Microsoft Exchange Server2021-11-0399.9%Known
CVE-2021-34473Microsoft Exchange Server2021-11-0399.9%Known
CVE-2021-31207Microsoft Exchange Server2021-11-0399.7%Known
CVE-2021-27065Microsoft Exchange Server2021-11-0399.8%Known
CVE-2021-26858Microsoft Exchange Server2021-11-0393.6%Known
CVE-2021-26857Microsoft Exchange Server2021-11-0395.7%Known
CVE-2021-26855Microsoft Exchange Server2021-11-0399.9%Known
CVE-2020-17144Microsoft Exchange Server2021-11-0336.5%Unknown

NVD — CVE-2023-21529

Data from CISA's Known Exploited Vulnerabilities (KEV) catalog. EPSS is FIRST's estimated probability of exploitation activity in the next 30 days, refreshed weekly. Always follow the vendor's official guidance.
About this page

A Microsoft Exchange Server vulnerability added to CISA's Known Exploited Vulnerabilities catalog on 2026-04-13.