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Threat Brief: Microsoft Vulnerability CVE-2020-1472 "Zerologon" ![Clock Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-clock.svg) 2 min read Related Products [![Advanced Threat Prevention icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/strata_RGB_logo_Icon_Color.png)Advanced Threat Prevention](https://unit42.paloaltonetworks.com/product-category/advanced-threat-prevention/ "Advanced Threat Prevention")[![Cortex XDR icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/cortex_RGB_logo_Icon_Color.png)Cortex XDR](https://unit42.paloaltonetworks.com/product-category/cortex-xdr/ "Cortex XDR")[![Next-Generation Firewall icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/strata_RGB_logo_Icon_Color.png)Next-Generation Firewall](https://unit42.paloaltonetworks.com/product-category/next-generation-firewall/ "Next-Generation Firewall") * ![Profile Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-profile-grey.svg) By: * [Brandon Young](https://unit42.paloaltonetworks.com/author/brandon-young/) * [Mike Harbison](https://unit42.paloaltonetworks.com/author/mike-harbison/) * ![Published Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-calendar-grey.svg) Published:September 17, 2020 * ![Tags Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-category.svg) Categories: * [High Profile Threats](https://unit42.paloaltonetworks.com/category/top-cyberthreats/) * [Vulnerabilities](https://unit42.paloaltonetworks.com/category/vulnerabilities/) * ![Tags Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-tags-grey.svg) Tags: * [CVE-2020-1472](https://unit42.paloaltonetworks.com/tag/cve-2020-1472/) * [Zerologon](https://unit42.paloaltonetworks.com/tag/zerologon/) * [![Download Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-download.svg)](https://unit42.paloaltonetworks.com/zerologon/?pdf=download&lg=en&_wpnonce=279fa6c5e6 "Click here to download") * [![Print Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-print.svg)](https://unit42.paloaltonetworks.com/zerologon/?pdf=print&lg=en&_wpnonce=279fa6c5e6 "Click here to print") Share![Down arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/down-arrow.svg) * ![Link Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-share-link.svg) * [![Link Email](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-sms.svg)](mailto:?subject=Threat%20Brief:%20Microsoft%20Vulnerability%20CVE-2020-1472%20“Zerologon”&body=Check%20out%20this%20article%20https%3A%2F%2Funit42.paloaltonetworks.com%2Fzerologon%2F "Share in email") * [![Facebook Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-fb-share.svg)](https://www.facebook.com/sharer/sharer.php?u=https%3A%2F%2Funit42.paloaltonetworks.com%2Fzerologon%2F "Share in Facebook") * [![LinkedIn Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-linkedin-share.svg)](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Funit42.paloaltonetworks.com%2Fzerologon%2F&title=Threat%20Brief:%20Microsoft%20Vulnerability%20CVE-2020-1472%20“Zerologon” "Share in LinkedIn") * [![Twitter Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-twitter-share.svg)](https://twitter.com/intent/tweet?url=https%3A%2F%2Funit42.paloaltonetworks.com%2Fzerologon%2F&text=Threat%20Brief:%20Microsoft%20Vulnerability%20CVE-2020-1472%20“Zerologon” "Share in Twitter") * [![Reddit Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-reddit-share.svg)](https://www.paloaltonetworks.com//www.reddit.com/submit?url=https%3A%2F%2Funit42.paloaltonetworks.com%2Fzerologon%2F&ts=markdown "Share in Reddit") * [![Mastodon Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-mastodon-share.svg)](https://mastodon.social/share?text=Threat%20Brief:%20Microsoft%20Vulnerability%20CVE-2020-1472%20“Zerologon”%20https%3A%2F%2Funit42.paloaltonetworks.com%2Fzerologon%2F "Share in Mastodon") ## **Executive Summary** In August 2020, Microsoft released a security update, [*CVE-2020-1472 | Netlogon Elevation of Privilege Vulnerability*](https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1472), for a new elevation of privilege (EoP) vulnerability also known as "Zerologon." This vulnerability was given the highest Common Vulnerability Scoring System (CVSS) score of 10.0 and given a "critical" security rating from Microsoft. This vulnerability exists within the [Netlogon protocol](https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-nrpc/2d776bfc-e81f-4c8f-9da8-4c2920f65413). Exploitation of this vulnerability is possible due to a flaw in the implementation of the Netlogon protocol encryption, specifically AES-CFB8. The vulnerability is triggered by sending a string of zeros to the Netlogon protocol, hence its name, "Zerologon." The flaw allows anyone on a network utilizing the Netlogon protocol to elevate their privileges to that of the domain administrator. This would allow an attacker access to the entire domain, opening up opportunities for further exploitation, data exfiltration, network disruption or whatever their objectives might be. This vulnerability affects multiple Microsoft Windows Server operating systems. ## **Mitigation Actions for Zerologon** As always, we recommend our customers patch their systems as soon as possible. If you want to test your network for this vulnerability, you can use the [Secura ZeroLogon testing script](https://github.com/SecuraBV/CVE-2020-1472). Microsoft has provided a workaround to secure the Netlogon channel that is associated with this vulnerability by publishing guidance on [how to manage the changes in Netlogon secure channel connections](https://support.microsoft.com/en-us/help/4557222/how-to-manage-the-changes-in-netlogon-secure-channel-connections-assoc) associated with the vulnerability. ## **Conclusion** The Palo Alto Networks [Threat Prevention](https://www.paloaltonetworks.com/products/secure-the-network/subscriptions/threat-prevention) cloud-delivered security subscription provides protection against the exploitation of this vulnerability: * Cortex XDR can block this exploit starting with Cortex agent 7.2.1 and content PTU-153 using Behavioral Threat Prevent Engine (BTP) rule: bioc.sync.zerologon\_exploit\_rpc. * [Next-Generation Firewalls](https://www.paloaltonetworks.com/network-security/next-generation-firewall.html) will prevent exploitation of the vulnerability by detecting on the vulnerable Windows API (NetrServerAuthenticate3) with spoofed credentials. The relevant Threat ID is 59336. Palo Alto Networks will update this Threat Brief with new information and recommendations as they become available. Back to top ### Tags * [CVE-2020-1472](https://unit42.paloaltonetworks.com/tag/cve-2020-1472/ "CVE-2020-1472") * [Zerologon](https://unit42.paloaltonetworks.com/tag/zerologon/ "zerologon") [Threat Research Center](https://unit42.paloaltonetworks.com "Threat Research") [Next: Network Attack Trends: Attackers Leveraging High Severity and Critical Exploits (May-July 2020)](https://unit42.paloaltonetworks.com/network-attack-trends/ "Network Attack Trends: Attackers Leveraging High Severity and Critical Exploits (May-July 2020)") ### Table of Contents * ### Related Articles * [Ransomware Review: First Half of 2024](https://unit42.paloaltonetworks.com/unit-42-ransomware-leak-site-data-analysis/ "article - table of contents") ## Related Vulnerabilities Resources ![Pictorial representation of a group of people interacting with a dynamic 3D holographic display of colorful, undulating data waves on a table.](https://unit42.paloaltonetworks.com/wp-content/uploads/2025/09/11_Myth-Busting_Overview_1920x900-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2025/08/Insights-icon-white.svg)Insights](https://unit42.paloaltonetworks.com/category/insights/) August 4, 2026 [#### The Frontier AI Vulnerability Burst: Industrializing Autonomous Zero-Day Discovery in Open-Source Software](https://unit42.paloaltonetworks.com/frontier-ai-vulnerability-burst/) * [AI](https://unit42.paloaltonetworks.com/tag/ai/ "AI") * [Frontier AI](https://unit42.paloaltonetworks.com/tag/frontier-ai/ "Frontier AI") * [Vulnerability Exploitation](https://unit42.paloaltonetworks.com/tag/vulnerability-exploitation/ "Vulnerability Exploitation") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/frontier-ai-vulnerability-burst/ "The Frontier AI Vulnerability Burst: Industrializing Autonomous Zero-Day Discovery in Open-Source Software") ![Pictorial representation of AI-enabled autonomous cyberattacks. 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Abstract image of a glowing red Wi-Fi symbol on a circuit board, with intricate patterns and a futuristic appearance.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/04/04_Vulnerabilities_1920x900-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) April 16, 2026 [#### A Deep Dive Into Attempted Exploitation of CVE-2023-33538](https://unit42.paloaltonetworks.com/exploitation-of-cve-2023-33538/) * [Botnet](https://unit42.paloaltonetworks.com/tag/botnet/ "botnet") * [Command injection](https://unit42.paloaltonetworks.com/tag/command-injection/ "Command injection") * [CVE-2023-33538](https://unit42.paloaltonetworks.com/tag/cve-2023-33538/ "CVE-2023-33538") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/exploitation-of-cve-2023-33538/ "A Deep Dive Into Attempted Exploitation of CVE-2023-33538") ![Pictorial representation of BeyondTrust vulnerability CVE-2026-1731. 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