CVE-2023-21761 Microsoft Exchange Server Information Disclosure Vulnerability
An attacker can exploit a Server-Side Request Forgery flaw in Microsoft Exchange Server to disclose sensitive information.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-21761?
CVE-2023-21761 is a high-severity server-side request forgery vulnerability in Microsoft Exchange Server, published on 10 Jan 2023. 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
Weakness: CWE-918
Which versions are affected by CVE-2023-21761?
It affects 1 product.
Products include Microsoft Exchange Server.
How do I fix CVE-2023-21761?
No fix has been published for CVE-2023-21761 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2023-21761 being exploited?
There is no known exploitation of CVE-2023-21761 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-4374-5gxx-h9r3.