Authenticated code execution from adjacent networks
Published Oct 13, 2021 · Updated Aug 3, 2024
Remote code execution in affected Microsoft Exchange Server builds allows remote authenticated users to execute arbitrary code from an adjacent network. Microsoft has not published the vulnerable component or the operation that mishandles attacker-controlled input. Exploitation requires low privileges and access to the same physical or logical network, and successful attacks can expose or alter data or interrupt service.
Summary
What happened
Remote code execution in affected Microsoft Exchange Server builds allows remote authenticated users to execute arbitrary code from an adjacent network. Microsoft has not published the vulnerable component or the operation that mishandles attacker-controlled input. Exploitation requires low privileges and access to the same physical or logical network, and successful attacks can expose or alter data or interrupt service.
The record
- CVE
- CVE-2021-26427
- Published
- Oct 13, 2021
- Updated
- Aug 3, 2024
- Vendor
- Microsoft
- Product
- Microsoft Exchange Server 2016 Cumulative Update 21
- Classifications
- T1210
- Attack vector
- adjacent
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 13, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record 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 <15.01.2308.015
What conditions does exploitation require?
What is affected?
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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