CVE-2020-1350

CRITICAL KEV

Windows Server 2008, 2012, 2016, 2019 - Remote Code Execution in DNS Server

Title source: llm
STIX 2.1

Exploitation Summary

CVE-2020-1350 is actively exploited and listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added November 3, 2021. EIP tracks 19 public exploits from researchers including ZephrFish, maxpl0it, psc4re.

AI-analyzed exploit summary This repository is a honeypot designed to deceive users into executing benign but misleading binaries (e.g., rick rolls, canary tokens) under the guise of a CVE-2020-1350 exploit. The actual exploit code is non-functional and serves as a trap.

Description

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'.

Exploits (19)

nomisec TROJAN 280 stars
by ZephrFish · poc
https://github.com/ZephrFish/CVE-2020-1350_HoneyPoC

This repository is a honeypot designed to deceive users into executing benign but misleading binaries (e.g., rick rolls, canary tokens) under the guise of a CVE-2020-1350 exploit. The actual exploit code is non-functional and serves as a trap.

Classification
Trojan 100%
Attack Type
Other
Complexity
Trivial
Reliability
Theoretical
Target: Windows DNS Server
No auth needed
Prerequisites: User interaction to execute scripts or binaries
devstral-2 · analyzed Feb 16, 2026 Full analysis →
nomisec WORKING POC 237 stars
by maxpl0it · dos
https://github.com/maxpl0it/CVE-2020-1350-DoS

This is a functional proof-of-concept exploit for CVE-2020-1350 (SIGRed), a heap-based buffer overflow in Windows DNS servers. The exploit triggers a denial-of-service (DoS) by sending a maliciously crafted DNS response with an overflowed SIG record, causing the target DNS service to crash.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: Windows DNS Server (versions affected by CVE-2020-1350)
No auth needed
Prerequisites: Control over a domain with custom nameservers · Network access to the target DNS server · Ability to intercept or trigger DNS queries for the malicious domain
devstral-2 · analyzed Feb 16, 2026 Full analysis →
nomisec SCANNER 163 stars
by psc4re · poc
https://github.com/psc4re/NSE-scripts

This repository contains NSE scripts for detecting vulnerabilities, including CVE-2020-1350 (SIGRed) and CVE-2020-0796 (SMBGhost). The scripts are designed for safe detection and do not include exploit payloads.

Classification
Scanner 90%
Attack Type
Info Leak
Complexity
Moderate
Reliability
Reliable
Target: Microsoft DNS Server (CVE-2020-1350), Microsoft SMBv3 (CVE-2020-0796)
No auth needed
Prerequisites: Nmap with NSE support · Network access to target
devstral-2 · analyzed Feb 16, 2026 Full analysis →
nomisec WORKING POC 18 stars
by captainGeech42 · dos
https://github.com/captainGeech42/CVE-2020-1350

This is a functional proof-of-concept exploit for CVE-2020-1350 (SIGRed), a vulnerability in Windows DNS Server that allows a denial-of-service (DoS) attack via a malformed DNS SIG query. The exploit crafts a malicious DNS response with a large SIG record to trigger a buffer overflow, causing the DNS service to crash.

Classification
Working Poc 100%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: Windows DNS Server (2003-2019)
No auth needed
Prerequisites: Network access to the target DNS server · Ability to send crafted DNS queries/responses · Python 3 with dnspython library
devstral-2 · analyzed Feb 16, 2026 Full analysis →
nomisec SCANNER 15 stars
by T13nn3s · poc
https://github.com/T13nn3s/CVE-2020-1350

This PowerShell script checks if a Windows DNS Server is vulnerable to CVE-2020-1350 by verifying the presence of security updates or registry workarounds. It does not exploit the vulnerability but provides a menu-driven interface to assess and apply mitigations.

Classification
Scanner 100%
Attack Type
Info Leak
Complexity
Trivial
Reliability
Reliable
Target: Windows DNS Server (2012, 2012 R2, 2016, 2019)
Auth required
Prerequisites: Administrator privileges · Windows DNS Server running
devstral-2 · analyzed Feb 16, 2026 Full analysis →
nomisec WORKING POC 11 stars
by connormcgarr · dos
https://github.com/connormcgarr/CVE-2020-1350

This repository contains a proof-of-concept exploit for CVE-2020-1350, a vulnerability in Windows DNS Server. The exploit leverages a heap-based buffer overflow in the DNSSEC SIG record parsing to achieve remote code execution.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Windows DNS Server (2003-2019)
No auth needed
Prerequisites: Access to a vulnerable Windows DNS Server · Ability to send crafted DNS queries
devstral-2 · analyzed Feb 16, 2026 Full analysis →
nomisec WRITEUP 9 stars
by corelight · poc
https://github.com/corelight/SIGRed

This repository provides a Zeek package for detecting exploitation attempts of CVE-2020-1350 (SIGRed), a critical vulnerability in Microsoft Windows DNS servers. It includes detection rules and notices for identifying large DNS responses indicative of exploitation.

Classification
Writeup 100%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft Windows DNS Server
No auth needed
Prerequisites: Network access to vulnerable DNS server
devstral-2 · analyzed Feb 16, 2026 Full analysis →
nomisec TROJAN 7 stars
by zoomerxsec · poc
https://github.com/zoomerxsec/Fake_CVE-2020-1350

This repository claims to be a PoC for CVE-2020-1350 but is actually a honeypot tool designed to track interest in the vulnerability. It performs no actual exploitation, instead sending a CanaryToken HTTP request and launching a Rick Astley video in Internet Explorer.

Classification
Trojan 100%
Attack Type
Other
Complexity
Trivial
Reliability
Theoretical
Target: N/A
No auth needed
devstral-2 · analyzed Feb 16, 2026 Full analysis →
nomisec WORKING POC 4 stars
by mr-r3b00t · poc
https://github.com/mr-r3b00t/CVE-2020-1350

This PowerShell script applies a local workaround for CVE-2020-1350 (SigRED) by setting the TcpReceivePacketSize registry value to 65280 and restarting the DNS service to mitigate the vulnerability. It checks if the system is a DNS server and whether the workaround is already applied.

Classification
Working Poc 90%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: Windows DNS Server
Auth required
Prerequisites: Administrative privileges on the target system · DNS service running on the target system
devstral-2 · analyzed Feb 16, 2026 Full analysis →
nomisec WRITEUP 2 stars
by simeononsecurity · poc
https://github.com/simeononsecurity/CVE-2020-1350-Fix

This repository provides a registry-based workaround for CVE-2020-1350, a critical RCE vulnerability in Windows DNS Server. It includes a PowerShell script to apply the mitigation and detailed documentation.

Classification
Writeup 100%
Attack Type
Other
Complexity
Trivial
Reliability
Reliable
Target: Windows DNS Server (versions affected by CVE-2020-1350)
Auth required
Prerequisites: Administrative access to modify registry · DNS Server role enabled
devstral-2 · analyzed Feb 16, 2026 Full analysis →
nomisec SCANNER 2 stars
by graph-inc · poc
https://github.com/graph-inc/CVE-2020-1350

This repository contains a PowerShell script to check for CVE-2020-1350 vulnerability in Windows DNS Server and apply a registry-based workaround. It verifies DNS service status, patch installation, and registry settings.

Classification
Scanner 95%
Attack Type
Info Leak
Complexity
Trivial
Reliability
Reliable
Target: Windows DNS Server (versions affected by CVE-2020-1350)
Auth required
Prerequisites: Administrator privileges · Windows DNS Server running
devstral-2 · analyzed Feb 16, 2026 Full analysis →
nomisec WORKING POC
by sty886 · dos
https://github.com/sty886/CVE-2020-1350-SigRed

This repository contains a functional Python exploit for CVE-2020-1350 (SIGRed), a Windows DNS server vulnerability. The exploit crafts malicious DNS responses to trigger a heap-based buffer overflow, causing a denial-of-service (DoS) condition.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: Windows DNS Server (versions prior to the July 2020 patch)
No auth needed
Prerequisites: Control over a domain with custom nameservers · Ability to send DNS queries to the target server
devstral-2 · analyzed Mar 07, 2026 Full analysis →
nomisec WORKING POC
by gdwnet · poc
https://github.com/gdwnet/cve-2020-1350

This PowerShell script mitigates CVE-2020-1350 (SigRed) by setting a registry key on all domain controllers to limit DNS packet size and restarting the DNS service. It requires domain admin credentials to execute remotely.

Classification
Working Poc 90%
Attack Type
Other
Complexity
Moderate
Reliability
Reliable
Target: Windows DNS Server (2003-2019)
Auth required
Prerequisites: Domain admin credentials · Active Directory environment · PowerShell execution policy allowing scripts
devstral-2 · analyzed Feb 16, 2026 Full analysis →
nomisec STUB
by CVEmaster · poc
https://github.com/CVEmaster/CVE-2020-1350

The repository contains only a README with minimal information about CVE-2020-1350, a Windows DNS Server vulnerability, and mentions a binary PoC without providing the actual exploit code or details.

Classification
Stub 30%
Attack Type
Rce
Complexity
Theoretical
Reliability
Theoretical
Target: Windows DNS Server (versions affected by CVE-2020-1350)
No auth needed
Prerequisites: Network access to a vulnerable Windows DNS Server
devstral-2 · analyzed Feb 16, 2026 Full analysis →
nomisec WRITEUP
by jmaddington · poc
https://github.com/jmaddington/dRMM-CVE-2020-1350-response

This repository provides a mitigation script for CVE-2020-1350, a critical RCE vulnerability in Windows DNS Server. It includes a PowerShell script to generate a resource.xml file for Datto RMM or other RMM tools to apply the mitigation without rebooting.

Classification
Writeup 90%
Attack Type
Other
Complexity
Trivial
Reliability
Reliable
Target: Windows DNS Server (2003 and later)
Auth required
Prerequisites: Access to the target system with administrative privileges
devstral-2 · analyzed Feb 16, 2026 Full analysis →
patchapalooza WORKING POC
by keyboxdzd · poc
https://gitee.com/keyboxdzd/SIGRed_RCE_PoC

This repository contains a functional exploit for CVE-2020-1350 (SigRed), a remote code execution vulnerability in Windows DNS Server. The exploit leverages a heap-based buffer overflow to achieve arbitrary code execution via a malicious DNS response.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Complex
Reliability
Reliable
Target: Windows DNS Server (2012, 2012R2, 2016, 2019)
No auth needed
Prerequisites: Attacker-controlled DNS server · Victim DNS server configured to forward requests to attacker · Network access to target DNS server
devstral-2 · analyzed Feb 23, 2026 Full analysis →
patchapalooza WORKING POC
by chompie1337 · client-side
https://github.com/chompie1337/SIGRed_RCE_PoC

This repository contains a functional exploit for CVE-2020-1350 (SIGRed), a remote code execution vulnerability in Windows DNS Server. The exploit leverages a heap-based buffer overflow in the DNS server's SIG record parsing to achieve arbitrary code execution.

Classification
Working Poc 100%
Attack Type
Rce
Complexity
Complex
Reliability
Reliable
Target: Windows DNS Server (2012, 2012R2, 2016, 2019)
No auth needed
Prerequisites: Control over a malicious DNS server · Ability to send crafted DNS responses to the target · Apache server to host the reverse shell payload
devstral-2 · analyzed Feb 23, 2026 Full analysis →
patchapalooza WORKING POC
by cracklee · poc
https://gitee.com/cracklee/cve-2020-1350

The repository contains a Bash script designed to exploit CVE-2020-1350 (SIGRed), a critical RCE vulnerability in Windows DNS Server. The script is intended to achieve Domain Admin privileges on vulnerable Domain Controllers.

Classification
Working Poc 90%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Windows DNS Server (Windows Server 2003 to 2019)
No auth needed
Prerequisites: Local LAN access · Linux OS (attacker)
devstral-2 · analyzed Feb 23, 2026 Full analysis →
patchapalooza WORKING POC
by lmdy · poc
https://gitee.com/lmdy/CVE-2020-1350-DoS

This repository contains a functional exploit for CVE-2020-1350 (SIGRed), a heap-based buffer overflow in Windows DNS Server. The exploit triggers a DoS by sending a maliciously crafted DNS response with an overflowed SIG record, causing the DNS service to crash.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: Windows DNS Server (versions affected by CVE-2020-1350)
No auth needed
Prerequisites: Control over a domain with custom nameservers · Ability to send DNS queries to the target server
devstral-2 · analyzed Feb 23, 2026 Full analysis →

Scores

CVSS v3 10.0
EPSS 0.9381
EPSS Percentile 99.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation active
Automatable yes
Technical Impact total

Details

CISA KEV 2021-11-03
VulnCheck KEV 2020-10-20
InTheWild.io 2021-07-23
ENISA EUVD EUVD-2020-12226
CWE
CWE-20
Status published
Products (6)
microsoft/windows_server_2008
microsoft/windows_server_2008 r2 sp1
microsoft/windows_server_2012
microsoft/windows_server_2012 r2
microsoft/windows_server_2016
microsoft/windows_server_2019
Published Jul 14, 2020
KEV Added Nov 03, 2021
Tracked Since Feb 18, 2026