CVE-2021-31978 Microsoft Defender Denial of Service Vulnerability
An attacker can cause a denial of service in the Microsoft Malware Protection Engine, affecting systems relying on this security component.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-31978?
CVE-2021-31978 is a medium-severity denial of service vulnerability in Microsoft Malware Protection Engine, published on 8 Jun 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
Microsoft Defender Denial of Service Vulnerability
Which versions are affected by CVE-2021-31978?
It affects 1 product.
Products include Microsoft Malware Protection Engine.
How do I fix CVE-2021-31978?
No fix has been published for CVE-2021-31978 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-31978 being exploited?
There is no known exploitation of CVE-2021-31978 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Malware Protection Engine
Sources
Also known as GHSA-9mqr-qv46-7v82.