Vulnerability Intelligence Report
Microsoft Exchange Server Information Disclosure Vulnerability
CVE-2021-33766
Microsoft Exchange Server Information Disclosure Vulnerability
CISA KEV
Nuclei Template
SSVC: Active Exploitation
Automatable
CVSS Base Score
7.3
HIGH
Exploitability:3.9
Impact Score:3.4
EPSS Probability:97.50%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-287 ↗CWE-287 (via CISA KEV)
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Microsoft | Microsoft Exchange Server 2013 Cumulative Update 23 | 15.00.0 < 15.00.1497.015 (affected) |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 19 | 15.01.0 < 15.01.2176.012 (affected) |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 20 | 15.01.0 < 15.01.2242.008 (affected) |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 8 | 15.02.0 < 15.02.0792.013 (affected) |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 9 | 15.02.0 < 15.02.0858.010 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
CISA KEV
ACTIVE IN CATALOG
Nuclei Template
SCANNER AVAILABLE
EPSS Score
97.502%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Microsoft Corporation · Vendor · USA |
| Reserved | 2021-05-28T00:00:00 |
| Published | 2021-07-14T17:53:40 |
| Patch Date | 2021-07-13 |
| Last Updated | 2026-08-10T15:11:36 |
Community Chatter & Buzz