CVE-2020-1350: Microsoft Windows DNS Server Remote Code Execution Vulnerability

CISA Known Exploited Vulnerabilities

Name

Microsoft Windows DNS Server Remote Code Execution Vulnerability

Vendor

Microsoft

Product

Windows

Added to the catalog

2021-11-03

Due date for US federal agencies

2022-05-03

Catalog version

2026.10.30

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 (CISA)

Apply updates per vendor instructions.

Ransomware use: CISA does not mark known use of this vulnerability in ransomware campaigns.

Links in CISA's notes

• https://www.cisa.gov/news-events/directives/ed-20-03-mitigate-windows-dns-server-remote-code-execution-vulnerability-july-2020-patch-tuesday)
• https://nvd.nist.gov/vuln/detail/CVE-2020-1350

Read on 2026-11-02T23:39:54.475Z under licence cisa-kev-cc0@b0067899 from https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

NVD analysis

Status

Analyzed

Published

2020-07-14T23:15:13.087

Last modified

2026-06-17T03:01:10.590

Weaknesses

NVD-CWE-noinfo, CWE-20

A remote code execution vulnerability exists in Windows Domain Name System servers when they fail to properly handle requests, aka 'Windows DNS Server Remote Code Execution Vulnerability'.

References

• http://packetstormsecurity.com/files/158484/SIGRed-Windows-DNS-Denial-Of-Service.html (Third Party Advisory, VDB Entry)
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1350 (Patch, Vendor Advisory)
• http://packetstormsecurity.com/files/158484/SIGRed-Windows-DNS-Denial-Of-Service.html (Third Party Advisory, VDB Entry)
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1350 (Patch, Vendor Advisory)
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-1350 (US Government Resource)

This product uses the NVD API but is not endorsed or certified by the NVD.

Read on 2026-11-02T23:41:51.476Z under licence nvd-api-terms-of-use@ff2a5288 from https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2020-1350

CVE record

Assigner

microsoft

State

PUBLISHED

Published

2020-07-14T22:54:06.000Z

Updated

2025-10-21T23:35:39.529Z

Problem types

Remote Code Execution

A remote code execution vulnerability exists in Windows Domain Name System servers when they fail to properly handle requests, aka 'Windows DNS Server Remote Code Execution Vulnerability'.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1350
• http://packetstormsecurity.com/files/158484/SIGRed-Windows-DNS-Denial-Of-Service.html

Read on 2026-11-03T01:03:23.748Z under licence cve-terms-of-use@81bfa2f3 from https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2020/1xxx/CVE-2020-1350.json

Detection rules (SigmaHQ)

SigmaHQ rules whose own tags name this CVE. Each rule page shows the rule as its author published it.

• DNS RCE CVE-2020-1350 (status test, level critical)

Defensive techniques (MITRE D3FEND)

D3FEND maps these defensive techniques to the weakness (CWE) that NVD lists for this CVE, through the digital artifacts the weakness affects. D3FEND does not say they stop this vulnerability.

MITRE D3FEND™ knowledge graph. © 2025 The MITRE Corporation.
"The MITRE Corporation (MITRE) hereby grants you a non-exclusive, royalty-free license to use D3FEND for research, development, and commercial purposes. Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." Terms: https://d3fend.mitre.org/tou/