CVE-2025-10495 is a vulnerability categorized under CWE-295 (Improper Certificate Validation) found in several Lenovo client applications, including Lenovo PC Manager, Lenovo App Store, Lenovo Browser, and Lenovo Legion Zone. The root cause is the failure of these applications to properly validate TLS/SSL certificates, which can be exploited by an attacker positioned on the same logical network (e.g., same Wi-Fi or LAN segment). This improper validation allows an attacker to perform man-in-the-middle (MITM) attacks, intercepting and manipulating network communications. By exploiting this flaw, the attacker can inject malicious payloads or commands, leading to arbitrary code execution within the context of the vulnerable application. The vulnerability does not require prior authentication or user interaction, increasing its risk profile. The CVSS 4.0 vector indicates attack vector as adjacent network (AV:A), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), and high impact on confidentiality, integrity, and availability (VC:H/VI:H/VA:H). Although no exploits have been reported in the wild yet, the high severity score (7.7) and the critical nature of the affected applications make this a significant threat. The vulnerability affects all versions of the Lenovo App Store and related clients as of the publication date, with no patches currently available. The flaw could be leveraged to compromise system integrity, steal sensitive data, or disrupt service availability.

For European organizations, the impact of CVE-2025-10495 can be substantial. Lenovo client applications are widely used in enterprise environments for device management, software updates, and system monitoring. Exploitation could lead to unauthorized code execution, enabling attackers to gain footholds within corporate networks, escalate privileges, or move laterally. This could result in data breaches, disruption of business operations, or deployment of ransomware and other malware. Critical sectors such as finance, manufacturing, healthcare, and government agencies that rely on Lenovo hardware and software are particularly vulnerable. The requirement for network proximity limits remote exploitation but does not eliminate risk, especially in environments with shared or poorly segmented networks. The absence of user interaction and authentication requirements further increases the likelihood of successful exploitation in internal networks or compromised Wi-Fi environments. The vulnerability also poses risks to supply chain security where Lenovo devices are used extensively.

To mitigate CVE-2025-10495, European organizations should implement the following specific measures: 1) Enforce strict network segmentation and isolate management and update services from general user networks to reduce attacker proximity. 2) Deploy network intrusion detection/prevention systems (IDS/IPS) tuned to detect anomalous MITM or certificate spoofing attempts targeting Lenovo applications. 3) Monitor network traffic for unusual TLS certificate anomalies or unexpected connections to Lenovo client services. 4) Restrict use of unsecured or public Wi-Fi networks for devices running vulnerable Lenovo applications. 5) Prepare for rapid deployment of vendor patches by maintaining an up-to-date asset inventory of Lenovo software versions. 6) Employ application allowlisting and endpoint detection and response (EDR) solutions to detect and block unauthorized code execution. 7) Educate IT staff about this vulnerability and ensure incident response plans include scenarios involving lateral movement via client application compromise. 8) Where possible, disable or limit the use of vulnerable Lenovo client applications until patches are released. 9) Engage with Lenovo support channels to obtain early patch notifications and guidance. These steps go beyond generic advice by focusing on network architecture, monitoring, and operational readiness tailored to this vulnerability’s characteristics.