Widely deployed Exchange Server; RCE via deserialization; KEV-listed.
CVE-2023-21529
Exchange Server deserialization enabling authenticated RCE.
Is CVE-2023-21529 being exploited?
Yes. CVE-2023-21529 appears in CISA's Known Exploited Vulnerabilities catalog, which means exploitation in the wild has been confirmed and reported. Treat it as active rather than theoretical, and patch it ahead of higher-scoring vulnerabilities that carry no exploitation evidence.
How severe is CVE-2023-21529?
CVE-2023-21529 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2023-21529?
Yes. A fix has been recorded for CVE-2023-21529. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2023-21529 affect?
CVE-2023-21529 affects Microsoft Exchange Server. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2023-21529?
Patch ASAP per vendor guidance
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated remote code execution via untrusted data deserialization; potential full server compromise.
Immediate action required
- affected>= 15.00.0 and < 15.00.1497.047
- affected>= 15.01.0 and < 15.01.2507.021
- affected>= 15.02.0 and < 15.02.0986.041
- affected>= 15.02.0 and < 15.02.1118.025
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.