Heap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code over a network.
According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability? Successful exploitation of this vulnerability requires an attacker to take additional actions prior to exploitation to prepare the target environment. How could an attacker exploit this vulnerability? Successful exploitation of this vulnerability would require a remote, unauthenticated attacker to entice a local user to take multiple actions that results in Defender scanning a malicious file that has been quarantined. References Identification Last version of the Microsoft Malware Protection Engine affected by this vulnerability 1.1.26030.3008 First version of the Microsoft Malware Protection Engine with this vulnerability addressed Version 1.1.26040.8 See Manage Updates Baselines Microsoft Defender Antivirus for more information. Microsoft Defender is disabled in my environment, why are vulnerability scanners showing that I am vulnerable to this issue? Vulnerability scanners are looking for specific binaries and version numbers on devices. Microsoft Defender files are still on disk even when disabled. Systems that have disabled Microsoft Defender are not in an exploitable state. Why is no action required to install this update? In response to a constantly changing threat landscape, Microsoft frequently updates malware definitions and the Microsoft Malware Protection Engine. In order to be effective in helping protect against new and prevalent threats, antimalware software must be kept up to date with these updates in a timely manner. For enterprise deployments as well as end users, the default configuration in Microsoft antimalware software helps ensure that malware definitions and the Microsoft Malware Protection Engine are kept up to date automatically. Product documentation also recommends that products are configured for automatic updating. Best practices recommend that customers regularly verify whether software distribution, such as the
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