CVE-2021-26854 Microsoft Exchange Server Remote Code Execution Vulnerability
Attackers can execute arbitrary code on Microsoft Exchange Server, requiring immediate patching by administrators.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-26854?
CVE-2021-26854 is a medium-severity code injection vulnerability in Microsoft Exchange Server, published on 2 Mar 2021. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Microsoft Exchange Server Remote Code Execution Vulnerability
Which versions are affected by CVE-2021-26854?
It affects 1 product.
Products include Microsoft Exchange Server.
How do I fix CVE-2021-26854?
No fix has been published for CVE-2021-26854 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2021-26854 being exploited?
There is no known exploitation of CVE-2021-26854 in the wild and no public exploit code.
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-2021-34523 Microsoft Exchange Server Privilege Escalation
- CVE-2023-21529 Microsoft Exchange Server Deserialization of Untrusted Data
Sources
Also known as GHSA-2xf7-r7hp-r5qc.