CVE Watch—

CVE-2020-1350

Microsoft Windows DNS Server Remote Code Execution Vulnerability

CVSS

—

No CVSS

EPSS

96.7%

p100

KEV

YES

Nov 3, 2021

Exploit Today

0-100

Published: — · Last modified: —

EPSS · 30d

91.4%EPSS · 30 days96.7%

2026-09-162026-10-14

KEV catalog record

Product

Microsoft / Windows

Vulnerability

Microsoft Windows DNS Server Remote Code Execution Vulnerability

Added to KEV

Nov 3, 2021

Remediate by

May 3, 2022

Known ransomware use

Summary description

Microsoft Windows DNS Servers fail to properly handle requests, allowing an attacker to perform remote code execution in the context of the Local System Account. The vulnerability is also known under the moniker of SIGRed.

Required action

Apply updates per vendor instructions.

Notes

Reference CISA's ED 20-03 (https://www.cisa.gov/news-events/directives/ed-20-03-mitigate-windows-dns-server-remote-code-execution-vulnerability-july-2020-patch-tuesday) for further guidance and requirements. Note: The due date for addressing this vulnerability aligns with the requirements outlined in ED 20-03. https://nvd.nist.gov/vuln/detail/CVE-2020-1350

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