VIR Vulnerability Intelligence Relay

CVE-2023-21529

unknown KEV
Published 2026-04-13 · Modified 2026-04-13
CVSS v3
—
CVSS v2
—
VIR risk
1.5

Description

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

CISA KEV

Vendor
Microsoft
Product
Exchange Server
Due date
2026-04-27

Predictions

Exploit likelihood
99%
Patch ETA
—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: cisa-kev — https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21529 ; https://nvd.nist.gov/vuln/detail/CVE-2023-21529

Exploits

References

Verify integrity in audit chain (admin only). AS-IS.