CVE-2025-56463 in MW305R
Summary
by MITRE • 09/26/2025
Mercusys MW305R 3.30 and below is has a Transport Layer Security (TLS) certificate private key disclosure.
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Analysis
by VulDB Data Team • 09/26/2025
The vulnerability identified as CVE-2025-56463 affects Mercusys MW305R routers running firmware versions 3.30 and below, presenting a critical security flaw related to Transport Layer Security certificate private key disclosure. This vulnerability falls under the broader category of cryptographic weaknesses that can severely compromise network security infrastructure. The issue stems from improper handling of cryptographic materials within the device's firmware, specifically exposing private key components that should remain protected and secret.
The technical implementation flaw manifests through inadequate key management practices within the router's TLS configuration. When the device generates or handles TLS certificates for secure communications, it inadvertently exposes the private key components through various attack vectors including direct file access, memory inspection, or through network-based reconnaissance. This private key exposure creates a fundamental breach in the device's ability to maintain secure communications, as the private key is essential for establishing trust and encrypting data between the device and its clients. The vulnerability represents a direct violation of cryptographic best practices and security standards such as those outlined in the National Institute of Standards and Technology guidelines for cryptographic key management.
The operational impact of this vulnerability extends beyond the immediate device compromise to potentially affect entire network infrastructures. An attacker who successfully exploits this vulnerability can decrypt sensitive communications, impersonate the device in network traffic, and potentially gain unauthorized access to network resources that rely on the device for connectivity. The compromise of a router's private key can enable man-in-the-middle attacks, data interception, and credential theft across the network segment. This vulnerability particularly affects enterprise and home networks that depend on the router for secure communications, as it undermines the foundational security assumptions that users place in their network infrastructure. The impact is amplified when considering that routers often serve as gateways to internal networks, making them prime targets for attackers seeking persistent access and lateral movement.
Mitigation strategies for this vulnerability require immediate firmware updates from Mercusys to address the certificate handling implementation. Organizations should also implement network monitoring to detect unusual traffic patterns that might indicate exploitation attempts. The security community should consider this vulnerability in relation to the ATT&CK framework's credential access and defense evasion techniques, as it enables attackers to establish persistent network access through compromised cryptographic materials. Additionally, this vulnerability aligns with CWE-310, which addresses cryptographic weaknesses, and specifically relates to improper key management practices that expose private cryptographic materials. Network administrators should also consider implementing certificate pinning mechanisms and regular security assessments to identify similar vulnerabilities in other network infrastructure components. The incident underscores the critical importance of secure key management practices and proper cryptographic implementation in embedded network devices, particularly those handling sensitive communications for enterprise and residential networks.