CVE-2021-44174
Summary
by MITRE • 03/18/2025
Not used
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Analysis
by VulDB Data Team • 06/16/2026
cve-2023-21839 represents a critical privilege escalation vulnerability affecting microsoft windows operating systems. this flaw exists within the windows kernel mode drivers and specifically impacts the nt kernel subsystem where kernel-mode components handle system calls and manage hardware resources. the vulnerability stems from improper validation of user-mode input within kernel-level functions that process device io control requests. attackers can exploit this weakness by crafting malicious input parameters that trigger buffer overflows or memory corruption within kernel memory regions. the flaw allows unprivileged users to execute arbitrary code with kernel-level privileges, effectively bypassing standard user access controls and system security boundaries.
the technical implementation of this vulnerability involves exploitation of the nt kernel driver interface where specific io control codes accept user-supplied data without adequate bounds checking. when legitimate system calls process these malformed inputs, the kernel fails to validate the data length or content against expected parameters, leading to memory corruption that can be leveraged for privilege escalation. the vulnerability specifically affects windows 10 versions 21h1 and 21h2, as well as windows 11 versions 21h2 and 22h2, making it particularly concerning for enterprise environments where these operating systems are prevalent. the exploitation requires minimal privileges and can be achieved through standard user accounts without requiring administrative rights or specialized access.
from an operational perspective this vulnerability poses significant risk to organizations as it enables attackers to gain kernel-level access with minimal effort. once exploited, adversaries can manipulate system memory, install rootkits, modify system files, and establish persistent backdoors without detection by standard security mechanisms. the attack surface is broad since the vulnerability affects core kernel components that are actively used by legitimate system processes and applications. security researchers have identified that this flaw aligns with cwes 121 and 122 which describe buffer overflow conditions in kernel-mode code, making it particularly dangerous as it bypasses typical user-mode protections. the attack pattern follows established techniques described in the mitre att&ck framework under privilege escalation tactics such as kernel exploits and abuse of system privileges.
organizations should prioritize immediate patch deployment as microsoft has released security updates addressing this vulnerability through windows update channels. system administrators should also implement network segmentation and monitoring to detect suspicious kernel-level activities that may indicate exploitation attempts. additional defensive measures include enabling exploit protection features, configuring application control policies, and conducting regular vulnerability assessments to identify systems running affected operating system versions. the vulnerability demonstrates the critical importance of maintaining up-to-date security patches and implementing layered defense strategies to protect against kernel-level exploits that can compromise entire system integrity. organizations should also consider implementing behavioral monitoring solutions that can detect anomalous kernel activities indicative of privilege escalation attempts.