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Threat Brief: Microsoft Vulnerability CVE-2020-16898 ![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: * [Mike Harbison](https://unit42.paloaltonetworks.com/author/mike-harbison/) * [Brandon Young](https://unit42.paloaltonetworks.com/author/brandon-young/) * ![Published Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-calendar-grey.svg) Published:October 14, 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: * [Bad Neighbor](https://unit42.paloaltonetworks.com/tag/bad-neighbor/) * [CVE-2020-16898](https://unit42.paloaltonetworks.com/tag/cve-2020-16898/) * [Microsoft](https://unit42.paloaltonetworks.com/tag/microsoft/) * [![Download Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-download.svg)](https://unit42.paloaltonetworks.com/cve-2020-16898/?pdf=download&lg=en&_wpnonce=40dbae5d0f "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-2020-16898/?pdf=print&lg=en&_wpnonce=40dbae5d0f "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-2020-16898&body=Check%20out%20this%20article%20https%3A%2F%2Funit42.paloaltonetworks.com%2Fcve-2020-16898%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%2Fcve-2020-16898%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%2Fcve-2020-16898%2F&title=Threat%20Brief:%20Microsoft%20Vulnerability%20CVE-2020-16898 "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%2Fcve-2020-16898%2F&text=Threat%20Brief:%20Microsoft%20Vulnerability%20CVE-2020-16898 "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-2020-16898%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-2020-16898%20https%3A%2F%2Funit42.paloaltonetworks.com%2Fcve-2020-16898%2F "Share in Mastodon") ## **Executive Summary** In October 2020, during Microsoft's Patch Tuesday, a security update ([CVE-2020-16898](https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16898)) addressed a critical vulnerability discovered in IPv6 Router Advertisement Options (called "DNS RA options"). This vulnerability resides within the Windows TCP/IP stack that is responsible for handling RA packets. Current exploitation leads to a Denial of Service (DoS) with the possibility of remote code execution. This vulnerability affects multiple Windows versions that support IPv6 RDNSS, which was added to Windows starting with Windows 10, version 1709. ## **Mitigation Actions for CVE-2020-16898** As always, we recommend that our customers patch their system as soon as possible. Until a patch can be applied, Microsoft has [published guidance](https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16898) that can be used to mitigate this vulnerability. To help clarify the guidance Microsoft has published, we have outlined the steps that should be taken to disable IPv6 RDNSS. From an elevated privilege command prompt (such as Administrator), run the following command: a. Netsh int ipv6 sh int *This command will provide a list of* ***all*** *network IPv6 interfaces with the corresponding index numbers. Example output:* ![This gives an example of the output received after using a command to provide a list of all network IPv6 interfaces with the corresponding index numbers. Finding these numbers allows you to disable IPv6 RDNSS, mitigating CVE-2020-16898.](https://unit42.paloaltonetworks.com/wp-content/uploads/2020/10/word-image-29.png) Image 1. Output from netsh command. b\*.\* For **each** Idx number, run the command netsh int ipv6 set int Idx number rabaseddnsconfig=disable replacing Idx number with the Idx number listed from step a. This will disable the RDNSS feature for each interface, mitigating the vulnerability. c. To verify that RDNSS is disabled, issue the following command for **each** of the listed Idx numbers: netsh int ipv6 sh int Idx number. This command will output the parameters for the desired interface. Example output: ![This gives an example of the output received in the process of verifying that RDNSS is disabled, mitigating CVE-2020-16898.](https://unit42.paloaltonetworks.com/wp-content/uploads/2020/10/word-image-30.png) Image 2. Output from netsh command checking RDNSS value. \**RA Based DNS Config (RFC 6106) should be* ***disabled*** *for each interface.* ## **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: * [Next-Generation Firewall](https://www.paloaltonetworks.com/network-security/next-generation-firewall.html) customers with a Threat Prevention subscription and following best practices are protected against the exploitation of this vulnerability. The relevant Threat ID is 59240, and it was released with Applications and Threat content update version 8330. [Cortex XDR Pro](https://www.paloaltonetworks.com/cortex/cortex-xdr.html) customers can leverage the script execution capability to deploy the workaround published by Microsoft in their managed environments. Palo Alto Networks will update this Threat Brief with new information and recommendations as they become available. Back to top ### Tags * [Bad Neighbor](https://unit42.paloaltonetworks.com/tag/bad-neighbor/ "Bad Neighbor") * [CVE-2020-16898](https://unit42.paloaltonetworks.com/tag/cve-2020-16898/ "CVE-2020-16898") * [Microsoft](https://unit42.paloaltonetworks.com/tag/microsoft/ "Microsoft") [Threat Research Center](https://unit42.paloaltonetworks.com "Threat Research") [Next: Two New IoT Vulnerabilities Identified with Mirai Payloads](https://unit42.paloaltonetworks.com/iot-vulnerabilities-mirai-payloads/ "Two New IoT Vulnerabilities Identified with Mirai Payloads") ### Table of Contents * ### Related Articles * [How We Added WebAuthn to a Browser-Based RDP Client](https://unit42.paloaltonetworks.com/webauthn-added-to-browser-based-rdp/ "article - table of contents") * [Inside AD CS Escalation: Unpacking Advanced Misuse Techniques and Tools](https://unit42.paloaltonetworks.com/active-directory-certificate-services-exploitation/ "article - table of contents") * [Microsoft WSUS Remote Code Execution (CVE-2025-59287) Actively Exploited in the Wild (Updated November 3)](https://unit42.paloaltonetworks.com/microsoft-cve-2025-59287/ "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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