Vulnerability Intelligence Report
Microsoft Exchange Server Elevation of Privilege Vulnerability
CVE-2023-21709
Microsoft Exchange Server Elevation of Privilege Vulnerability
No Active Exploit Signals
CVSS Base Score
9.8
CRITICAL
Exploitability:3.9
Impact Score:5.9
EPSS Probability:2.10%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-307 ↗CWE-307: Improper Restriction of Excessive Authentication Attempts
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 23 | 15.01.0 < 15.01.2507.032 (affected) |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 12 | 15.02.0 < 15.02.1118.037 (affected) |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 13 | 15.02.0 < 15.02.1258.025 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
2.100%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Microsoft Corporation · Vendor · USA |
| Reserved | 2022-12-13T18:08:03 |
| Published | 2023-08-08T17:08:46 |
| Patch Date | 2023-08-08 |
| Last Updated | 2026-08-10T15:11:18 |
Community Chatter & Buzz