cve-2023-21529

{
  "cvss": 8.8,
  "datePublished": "2026-04-13",
  "dateUpdated": "2026-04-13",
  "description": "Microsoft Exchange Server contains a deserialization of untrusted data that allows an authenticated attacker to achieve remote code execution.",
  "dueDate": "2026-04-27",
  "id": "CVE-2023-21529",
  "kev_catalogs": [
    "cisa"
  ],
  "knownRansomwareCampaignUse": "Known",
  "notes": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21529 ; https://nvd.nist.gov/vuln/detail/CVE-2023-21529",
  "product": "Exchange Server",
  "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.",
  "severity": "HIGH",
  "source": "cisa_known_exploited",
  "title": "Microsoft Exchange Server Deserialization of Untrusted Data Vulnerability",
  "vendor": "Microsoft"
}