CVE-2023-21529

Timeline

Detection, updates, and resolution for this record.

1. Feb 14, 2023 · Catalog

   Detected

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

2. Apr 13, 2026 · CISA KEV

   Known exploited

   Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

3. Apr 27, 2026 · CISA KEV

   Remediation due

   Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

4. Aug 19, 2026 · Catalog

   Updated

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

Affected

• cpe microsoft/exchange server2013
• cpe microsoft/exchange server2016
• cpe microsoft/exchange server2019
• vendor Microsoft Exchange Serverversion unspecified

Sources

• CISA KEVCVE-2023-21529

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

  cisa.gov
• CVE.orgCVE-2023-21529

  Official CVE identifier

  cve.org
• FIRST EPSSCVE-2023-21529

  30-day exploitation probability 59.3%

  first.org
• NIST NVDCVE-2023-21529

  Microsoft Exchange Server Remote Code Execution Vulnerability

  nvd.nist.gov

References

• CISA note · msrc.microsoft.com
• CISA note · nvd.nist.gov
• US Government Resource · cisa.gov
• Technical Description · microsoft.com