CVE-2021-33766 Microsoft Exchange Server Information Disclosure
An attacker can exploit this vulnerability in Microsoft Exchange Server to disclose sensitive information.
- Exploited in the wild
- Since 18 Jan 2022
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-33766?
CVE-2021-33766 is a high-severity vulnerability in Microsoft Exchange Server, published on 14 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Microsoft Exchange Server Information Disclosure Vulnerability
Which versions are affected by CVE-2021-33766?
It affects 1 product.
Products include Microsoft Exchange Server.
How do I fix CVE-2021-33766?
No fix has been published for CVE-2021-33766 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 1 Feb 2022.
Is CVE-2021-33766 being exploited?
Yes. Attackers have exploited CVE-2021-33766 in the wild since at least 18 Jan 2022.
Public exploit code: 1 Nuclei template 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-2021-34523 Microsoft Exchange Server Privilege Escalation
- CVE-2023-21529 Microsoft Exchange Server Deserialization of Untrusted Data
Sources
Also known as GHSA-f9f4-96j3-5mvr.