CVE-2025-53154 in Windows
Summary
by MITRE • 08/12/2025
Null pointer dereference in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 11/22/2025
The vulnerability identified as CVE-2025-53154 represents a critical null pointer dereference flaw within the Windows Ancillary Function Driver for WinSock component, which serves as a foundational element in Windows networking stack operations. This driver operates at a low system level and handles various socket-related functions, making it a prime target for privilege escalation attacks. The vulnerability specifically manifests when the driver processes certain input parameters that result in a null pointer being dereferenced, leading to system instability and potential privilege elevation opportunities.
The technical implementation of this flaw occurs within the Windows Ancillary Function Driver for WinSock subsystem where improper validation of input parameters allows an attacker to craft specific requests that trigger the null pointer dereference condition. This condition typically arises when the driver attempts to access memory locations through pointers that have not been properly initialized or validated, resulting in a system crash or unexpected behavior. The flaw exists in the driver's handling of network socket operations and can be exploited through crafted inputs that bypass normal validation procedures. According to CWE standards, this vulnerability maps to CWE-476 which specifically addresses null pointer dereference conditions in software implementations.
From an operational perspective, the impact of this vulnerability extends beyond simple system instability to enable local privilege escalation attacks. An authorized attacker with legitimate system access can exploit this weakness to elevate their privileges from standard user level to system level, effectively gaining complete control over the affected system. The attack vector requires local system access but does not necessitate network connectivity, making it particularly dangerous in environments where user accounts may be compromised through other means. The privilege escalation capability allows attackers to bypass standard security controls, access restricted system resources, and potentially establish persistent access to the compromised system.
The exploitation of this vulnerability aligns with several tactics described in the ATT&CK framework, particularly focusing on privilege escalation techniques and system access methods. Attackers can leverage this weakness to gain SYSTEM-level privileges, which enables them to modify system files, install malicious software, and access sensitive data across the entire system. The attack chain typically involves initial access through legitimate user credentials followed by exploitation of the driver vulnerability to achieve privilege elevation. This makes the vulnerability particularly concerning for enterprise environments where user accounts may have elevated privileges or where system administrators maintain access to multiple systems.
Mitigation strategies for CVE-2025-53154 should prioritize immediate patch deployment from Microsoft, as the vendor has released security updates addressing this specific flaw. Organizations should implement comprehensive monitoring for unusual system behavior or kernel-level activity that might indicate exploitation attempts. Additionally, system hardening measures including disabling unnecessary network services and implementing strict access controls can reduce the attack surface. Network segmentation and privilege separation practices should be reinforced to limit potential damage from successful exploitation attempts. Regular vulnerability assessments and security audits should be conducted to identify similar weaknesses in other system components, particularly within the Windows networking stack and driver subsystems. The implementation of exploit prevention technologies and behavioral monitoring systems can provide additional layers of protection against exploitation attempts targeting this and similar vulnerabilities.