CVE-2025-62404 is a heap-based buffer overflow vulnerability identified in the TP-Link Archer AX53 v1.0 router, affecting firmware versions through 1.3.1 Build 20241120. The flaw resides in the tmpserver modules, which process network packets. An attacker with authenticated access on an adjacent network segment can send a specially crafted packet whose length exceeds the expected maximum, leading to a heap overflow. This overflow can cause a segmentation fault, resulting in denial of service, or potentially allow the attacker to execute arbitrary code with elevated privileges on the device. The vulnerability requires the attacker to be authenticated and adjacent, which limits remote exploitation but still poses a significant risk within local or compromised networks. The CVSS 4.0 vector indicates attack vector as adjacent network (AV:A), high attack complexity (AC:H), no user interaction (UI:N), and high privileges required (PR:H). The impact on confidentiality, integrity, and availability is high, as arbitrary code execution could lead to full device compromise. No public patches or exploits are currently available, but the vulnerability is publicly disclosed and should be addressed promptly.

This vulnerability poses a significant risk to organizations using the TP-Link Archer AX53 router, particularly in environments where attackers can gain authenticated access to the local network segment. Successful exploitation could lead to device compromise, allowing attackers to intercept, manipulate, or disrupt network traffic, potentially pivot to other internal systems, or establish persistent footholds. This could result in loss of confidentiality, integrity, and availability of network communications and connected devices. The requirement for authentication and adjacency reduces the likelihood of remote exploitation but does not eliminate risk in environments with weak access controls or insider threats. Given the widespread use of TP-Link routers in small to medium enterprises and home networks, the impact could be broad, affecting network reliability and security posture.

Organizations should immediately audit and restrict access to the management interfaces and network segments where the Archer AX53 routers operate, ensuring only trusted and authenticated users have access. Network segmentation should be enforced to limit adjacency exposure. Monitoring for unusual network packets or segmentation faults on these devices can help detect exploitation attempts. Since no patches are currently available, consider temporarily disabling or restricting the tmpserver modules if feasible. Employ strong authentication mechanisms and change default credentials to reduce the risk of unauthorized access. Plan for prompt firmware updates once TP-Link releases a patch addressing this vulnerability. Additionally, implement network-level protections such as intrusion detection/prevention systems (IDS/IPS) configured to detect anomalous packet sizes or malformed packets targeting the router.