[![Logo](https://www.paloaltonetworks.com/wp-content/uploads/2021/07/PANW_Parent.png)](https://www.paloaltonetworks.com/) [![Unit42 Logo](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/unit42-logo-white.svg)](https://unit42.paloaltonetworks.com/) Menu * [Tools](https://unit42.paloaltonetworks.com/tools/) * [ATOMs](https://unit42.paloaltonetworks.com/atoms/) * [Security Consulting](https://www.paloaltonetworks.com/unit42) * [About Us](https://unit42.paloaltonetworks.com/about-unit-42/) * [**Under Attack?**](https://start.paloaltonetworks.com/contact-unit42.html) English * [English](https://unit42.paloaltonetworks.com/cve-2020-17049/) * [Japanese](https://unit42.paloaltonetworks.com/ja/cve-2020-17049/) * [Threat Research Center](https://unit42.paloaltonetworks.com "Threat Research") * [High Profile Threats](https://unit42.paloaltonetworks.com/category/top-cyberthreats/ "High Profile Threats") * [Vulnerabilities](https://unit42.paloaltonetworks.com/category/vulnerabilities/ "Vulnerabilities") [Vulnerabilities](https://unit42.paloaltonetworks.com/category/vulnerabilities/) # Threat Brief: Kerberos KDC Security Feature Bypass Vulnerability (CVE-2020-17049 AKA Bronze Bit) ![Clock Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-clock.svg) \< 1 min read Related Products [![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") * ![Profile Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-profile-grey.svg) By: * [Aviad Meyer](https://unit42.paloaltonetworks.com/author/aviad-meyer/) * [Liav Zigelbaum](https://unit42.paloaltonetworks.com/author/liav-zigelbaum/) * ![Published Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-calendar-grey.svg) Published:March 3, 2021 * ![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-2020-17049](https://unit42.paloaltonetworks.com/tag/cve-2020-17049/) * [Kerberos](https://unit42.paloaltonetworks.com/tag/kerberos/) * [![Download Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-download.svg)](https://unit42.paloaltonetworks.com/cve-2020-17049/?pdf=download&lg=en&_wpnonce=edee969a51 "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/cve-2020-17049/?pdf=print&lg=en&_wpnonce=edee969a51 "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)]( "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%2Fcve-2020-17049%2F "Share in Facebook") * [![LinkedIn Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-linkedin-share.svg)]( "Share in LinkedIn") * [![Twitter Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-twitter-share.svg)]( "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%2Fcve-2020-17049%2F&ts=markdown "Share in Reddit") * [![Mastodon Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-mastodon-share.svg)]( "Share in Mastodon") ## ![](https://unit42.paloaltonetworks.com/wp-content/uploads/2021/03/word-image-13.png)Executive Summary A recent vulnerability in the Kerberos authentication protocol, [CVE-2020-17049](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-17049) ([dubbed Bronze Bit](https://blog.netspi.com/cve-2020-17049-kerberos-bronze-bit-overview/)), has been disclosed by Microsoft. The vulnerability is in the way that the Key Distribution Center (KDC) handles service tickets and validates whether delegation is allowed. In the attack, as detailed in the Palo Alto Networks Security Operations blog, "[Protecting Against the Bronze Bit Vulnerability with Cortex XDR](https://blog.paloaltonetworks.com/security-operations/bronze-bit-vulnerability-xdr/)," the attacker tampers with the Kerberos service ticket, which allows the attacker to authenticate to the target as any user, including sensitive accounts and members of the "Protected Users" group. ## Mitigation Actions for CVE-2020-17049 The vulnerability was [patched by Microsoft](https://support.microsoft.com/en-us/help/4598347/managing-deployment-of-kerberos-s4u-changes-for-cve-2020-17049), and the patch will be gradually deployed with upcoming Windows updates. Microsoft aims to enforce using the patch only on or after May 11, 2021. ## Conclusion Palo Alto Network customers running Cortex XDR version 7.3 with the latest content update are protected from "Pass-the-Ticket" attacks using the standard Windows API. Customers running Cortex XDR Pro with analytics enabled will get alerted on related suspicious activities and specifically on a delegation from or to a protected user. Palo Alto Networks will update this Threat Brief with new information and recommendations as they become available. ## **Additional Resources** * [Kerberos KDC Security Feature Bypass Vulnerability](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-17049) * [KB4598347: Managing deployment of Kerberos S4U changes for CVE-2020-17049](https://support.microsoft.com/en-us/topic/kb4598347-managing-deployment-of-kerberos-s4u-changes-for-cve-2020-17049-569d60b7-3267-e2b0-7d9b-e46d770332ab) * [Protecting Against the Bronze Bit Vulnerability with Cortex XDR](https://blog.paloaltonetworks.com/security-operations/bronze-bit-vulnerability-xdr/) Back to top ### Tags * [CVE-2020-17049](https://unit42.paloaltonetworks.com/tag/cve-2020-17049/ "CVE-2020-17049") * [Kerberos](https://unit42.paloaltonetworks.com/tag/kerberos/ "kerberos") [Threat Research Center](https://unit42.paloaltonetworks.com "Threat Research") [Next: Fast Flux 101: How Cybercriminals Improve the Resilience of Their Infrastructure to Evade Detection and Law Enforcement Takedowns](https://unit42.paloaltonetworks.com/fast-flux-101/ "Fast Flux 101: How Cybercriminals Improve the Resilience of Their Infrastructure to Evade Detection and Law Enforcement Takedowns") ### Table of Contents * ### Related Articles * [Precious Gemstones: The New Generation of Kerberos Attacks](https://unit42.paloaltonetworks.com/next-gen-kerberos-attacks/ "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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