Microsoft Exchange Server Privilege Escalation Vulnerability
What it is
Microsoft Exchange Server contains an unspecified vulnerability that allows for privilege escalation.
Who's affected
Affects anyone running on-premises Microsoft Exchange Server. If you have Exchange in your office (as opposed to Microsoft 365 hosted email), it's the mail server holding all internal email — full compromise reads every conversation it stores.
What to do
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CISA action deadline: March 7, 2024. Federal agencies must complete the required action by this date. For private SMBs the deadline is advisory — but treat it as a strong recommendation, especially if you handle regulated data (HIPAA, GLBA, ABA model rules).
If you don't have someone in-house to verify the patch deployed across every endpoint — or you're not sure whether you're affected — that's exactly the kind of triage we do. Book a free 20-minute triage call.
Severity
CVSS base score: 9.8 — CRITICAL
Weakness classification: CWE-287
Source
Pulled daily from the public cisagov/kev-data mirror (CC0). View the original entry on cisa.gov. CISA KEV is US-Government public-domain data; we add the SMB-vertical framing and the coping action above.