CVE-2025-21257 is an information disclosure vulnerability affecting Microsoft Windows WLAN AutoConfig Service. This vulnerability allows attackers with local access to potentially disclose sensitive information. The CVSS score for this vulnerability is 5.5, classifying it as medium severity. Organizations should be aware of the potential risks and prioritize remediation efforts.
Risk to organizations includes unauthorized access to sensitive information, which could lead to further exploitation if not addressed. The vulnerability affects several versions of Windows, making it critical for affected organizations to assess their systems.
Currently, there are no known exploits or public proof-of-concept code available for this vulnerability. However, organizations should remain vigilant and monitor for any updates regarding potential exploit development. Given the nature of the vulnerability, organizations should prioritize patching immediately.
The vulnerability was published on January 14, 2025, and organizations using affected versions of Windows should act promptly to ensure their environments are secure.
Vulnerability Details
The official description for CVE-2025-21257 states that it is an information disclosure vulnerability in the Windows WLAN AutoConfig Service.
The vulnerability is classified under CWE-125, indicating improper handling of buffer lengths, which can lead to information leakage.
The attack vector is local, meaning that an attacker must have access to the target system to exploit this vulnerability. The attack complexity is low, and it requires low privileges with no user interaction needed.
The confidentiality impact is rated as high, while integrity and availability impacts are rated as none. This indicates that the primary risk lies in the potential exposure of sensitive information.
Technical Analysis
The root cause of this vulnerability is related to the Windows WLAN AutoConfig Service's improper configuration and handling of sensitive data. Attackers may leverage this vulnerability by accessing the service locally to disclose sensitive information.
Given that the attack vector is local, the vulnerability requires an attacker to have physical or remote desktop access to the target machine. The attack complexity is low due to the straightforward nature of the exploit, and the required privileges are low, meaning that even standard users could potentially exploit this vulnerability.
User interaction is not required to exploit this vulnerability, which increases the risk for organizations. The high confidentiality impact means that sensitive information could potentially be leaked, while integrity and availability remain unaffected.
Risk & Impact Analysis
Organizations should assess the risk associated with this vulnerability based on their deployment of affected Windows versions. Given the nature of the vulnerability, the potential for information leakage poses a significant risk, especially for environments handling sensitive data.
The blast radius for this vulnerability could extend to any organization utilizing the affected Windows versions. Security teams must prioritize this vulnerability in their patch management processes to mitigate potential risks.
Organizations should address this vulnerability in their priority patch cycle. The CVSS score of 5.5 suggests that while it is not the highest severity, it still warrants immediate attention due to the potential for high confidentiality impact.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following versions of Microsoft products are affected by CVE-2025-21257:
Windows 10 versions 1607, 1809, 21H2, 22H2; Windows 11 versions 22H2, 23H2, 24H2; and Windows Server versions 2016, 2019, 2022, 2025.
Mitigation & Remediation
Microsoft has released patches to address this vulnerability. Organizations should apply the updates provided in the Security Update Guide.
For those unable to immediately apply the patch, consider implementing configuration hardening measures to minimize risk until the patch can be applied.
Organizations may also enhance their network controls and monitoring to detect any unauthorized access attempts.
Continuous security testing can validate the effectiveness of applied patches and configurations.
Detection Guidance
Organizations should monitor logs for indicators of unauthorized access attempts targeting the Windows WLAN AutoConfig Service.
Behavioral anomalies in network traffic may indicate attempts to exploit this vulnerability.
System changes related to the WLAN AutoConfig Service should also be monitored for any unexpected modifications.
AppSecure Threat Intelligence Insight
CVE-2025-21257 highlights the ongoing need for organizations to maintain robust security practices as vulnerabilities continue to surface in widely used software.
Security teams should track patterns in vulnerabilities to better anticipate future risks and reinforce their defenses.
For more detailed guidance on vulnerabilities and security assessments, organizations can refer to the vulnerability management program and the penetration testing methodology for ensuring comprehensive coverage against emerging threats.
Adopting proactive measures and fostering a culture of security awareness among staff can significantly mitigate risks associated with vulnerabilities like CVE-2025-21257.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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