CVE-2021-34523 Microsoft Exchange Server Privilege Escalation
An attacker can elevate privileges on Microsoft Exchange Server, potentially gaining unauthorized access to sensitive data and system controls.
- Exploited in the wild
- Since 3 Nov 2021
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-34523?
CVE-2021-34523 is a critical vulnerability in Microsoft Exchange Server, published on 14 Jul 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Microsoft Exchange Server Elevation of Privilege Vulnerability
Which versions are affected by CVE-2021-34523?
It affects 1 product.
Products include Microsoft Exchange Server.
How do I fix CVE-2021-34523?
No fix has been published for CVE-2021-34523 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 17 Nov 2021.
Is CVE-2021-34523 being exploited?
Yes. Attackers have exploited CVE-2021-34523 in the wild since at least 3 Nov 2021, including in ransomware campaigns.
Public exploit code: 1 Metasploit module and 2 proofs of concept on GitHub.
Other vulnerabilities in Microsoft Exchange Server
- CVE-2024-21410 Microsoft Exchange Server Privilege Escalation
- CVE-2021-34473 Microsoft Exchange Server Remote Code Execution
- CVE-2021-26855 Microsoft Exchange Server Remote Code Execution
- CVE-2023-21529 Microsoft Exchange Server Deserialization of Untrusted Data
- CVE-2022-41080 Microsoft Exchange Server Privilege Escalation
Sources
Also known as GHSA-gcrr-725q-f8jw.