{"cveID":"CVE-2023-21529","vendorProject":"Microsoft","product":"Exchange Server","vulnerabilityName":"Microsoft Exchange Server Deserialization of Untrusted Data Vulnerability","dateAdded":"2026-04-13","shortDescription":"Microsoft Exchange Server contains a deserialization of untrusted data that allows an authenticated attacker to achieve remote code execution.","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","dueDate":"2026-04-27","knownRansomwareCampaignUse":"Known","notes":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21529 ; https://nvd.nist.gov/vuln/detail/CVE-2023-21529","cwes":["CWE-502"],"year":2023,"state":"unmapped","stale_reasons":[],"mappings":[],"techniques":[],"mapping_types":[],"has_exploitation_technique":false,"mapping_attack_versions":[],"mapping_domains":[],"sigma_coverage":null,"sigma_rules_tagged_cve":[],"added_after_mapping_snapshot":true,"_source":"kevmap","_built":"2026-08-24 19:45 UTC","_attack_version":"19.2"}