CVE-2021-43247: Microsoft Windows tcpip.sys Heap-based Buffer Overflow Local Privilege Escalation Vulnerability

First published: Tue Dec 14 2021(Updated: )

This vulnerability allows local attackers to escalate privileges on affected installations of Microsoft Windows. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the tcpip.sys driver. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length heap-based buffer. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM.

Credit: secure@microsoft.com secure@microsoft.com

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Read MoreStart Free Trial

• collector/msrc-cve
• agent/type
• agent/first-publish-date
• collector/nvd-index
• agent/software-canonical-lookup-request
• agent/references
• agent/title
• agent/severity
• agent/remedy
• agent/weakness
• agent/description
• collector/zdi-advisory
• source/ZDI
• alias/ZDI-21-1554
• alias/ZDI-CAN-14456
• alias/CVE-2021-43247
• agent/software-canonical-lookup
• source/Microsoft
• collector/mitre-cve
• source/MITRE
• collector/nvd-api
• source/NVD
• agent/last-modified-date
• agent/author
• agent/tags
• agent/softwarecombine
• agent/event
• agent/trending
• vendor/microsoft
• canonical/microsoft windows 10
• version/microsoft windows 10/20h2
• version/microsoft windows 10/21h1
• version/microsoft windows 10/21h2
• version/microsoft windows 10/1809
• version/microsoft windows 10/1909
• version/microsoft windows 10/2004
• canonical/microsoft windows 11
• canonical/microsoft windows server
• version/microsoft windows server/20h2
• version/microsoft windows server/2022
• canonical/microsoft windows server 2016
• version/microsoft windows server 2016/2004
• canonical/microsoft windows server 2019
• canonical/microsoft windows
• canonical/microsoft windows server 2022
• version/microsoft windows 11/21h2
• version/microsoft windows server/2004