Firetruck

CVE-2023-21529

KEV · Ransomware
Updated Aug 19, 2026 · PUBLISHED
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Description

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

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Affected packages

PackageVendor / ProductVersion rangeStatus
Microsoft Exchange Server 2013 Cumulative Update 23Microsoft / Microsoft Exchange Server 2013 Cumulative Update 23>= 15.00.0, < 15.00.1497.047affected
Microsoft Exchange Server 2016 Cumulative Update 23Microsoft / Microsoft Exchange Server 2016 Cumulative Update 23>= 15.01.0, < 15.01.2507.021affected
Microsoft Exchange Server 2019 Cumulative Update 11Microsoft / Microsoft Exchange Server 2019 Cumulative Update 11>= 15.02.0, < 15.02.0986.041affected
Microsoft Exchange Server 2019 Cumulative Update 12Microsoft / Microsoft Exchange Server 2019 Cumulative Update 12>= 15.02.0, < 15.02.1118.025affected