CVE-2021-1647highunder attack

CVE-2021-1647: high-severity vulnerability in Microsoft Security Essentials

Microsoft Defender Remote Code Execution Vulnerability

Published · Updated

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

83Vexday Risk Score

Prioritize patching. It under exploitation confirmed by CISA and has a public proof of concept.

ssvc Actcvss 7.8epss 40%
from disclosure to weapon11 days
Published on NVDJan 12
1st PoC+11d
CISA KEV+295d
Action required by CISAfederal deadline: 2021-11-17

Apply updates per vendor instructions.

In short

A security flaw in Microsoft Defender allows an attacker to run malicious code on a computer without permission. This is dangerous because Defender is supposed to protect your system, not be a way for attackers to compromise it.

Technical detail

A remote code execution vulnerability in Microsoft Defender allows an attacker to execute arbitrary code with elevated privileges through a network vector or local exploitation path. The vulnerability requires specific preconditions but can lead to complete system compromise once the code is executed.

Summary generated and translated by AI from the official description.

The full analysis of this CVE is available in Portuguese →

Microsoft Defender Remote Code Execution Vulnerability
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
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