Adjacent authenticated elevation of privilege
Published Jul 14, 2021 · Updated Aug 10, 2026
Elevation of privilege in Microsoft Exchange Server 2016 and 2019 allows remote authenticated users to gain elevated rights. Microsoft has not published the affected component, vulnerable operation, or input path. Exploitation requires adjacent-network access and an existing low-privilege account; the exact elevated rights remain undisclosed.
Summary
What happened
Elevation of privilege in Microsoft Exchange Server 2016 and 2019 allows remote authenticated users to gain elevated rights. Microsoft has not published the affected component, vulnerable operation, or input path. Exploitation requires adjacent-network access and an existing low-privilege account; the exact elevated rights remain undisclosed.
The record
- CVE
- CVE-2021-33768
- Published
- Jul 14, 2021
- Updated
- Aug 10, 2026
- Vendor
- Microsoft
- Product
- Microsoft Exchange Server 2016 Cumulative Update 21
- Classifications
- T1068
- Attack vector
- adjacent
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 14, 2021CVE publishedPublication date reported by the CVE source.
- Aug 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=15.01.0 <15.01.2308.014
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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