CVE-2023-21529 · netVigilance record NV26-0078
Microsoft Exchange Server Deserialization of Untrusted Data
past due ransomware
What to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA deadline 2026-04-27 · passed 4 months ago · applies to US federal civilian agencies; used elsewhere as a reference SLA
What happened
Microsoft Exchange Server contains a deserialization of untrusted data that allows an authenticated attacker to achieve remote code execution.
Who is affected
Microsoft Exchange Server. Affected version ranges are listed in the vendor advisory and the NVD entry linked under Sources.
Weakness class: CWE-502.
Timeline
- Added to CISA KEVExploitation in the wild confirmed by CISA
- CISA remediation deadlinepassed 4 months ago
Sources
- NVD entry for CVE-2023-21529 nvd.nist.gov/vuln/detail/CVE-2023-21529
- CISA Known Exploited Vulnerabilities catalog www.cisa.gov/known-exploited-vulnerabilities-catalog
- msrc.microsoft.com msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21529
- nvd.nist.gov nvd.nist.gov/vuln/detail/CVE-2023-21529