CVE-2025-62405 in Archer AX53 v1.0
Summary
by MITRE • 02/03/2026
Heap-based Buffer Overflow vulnerability in TP-Link Archer AX53 v1.0 (tmpserver modules) allows authenticated adjacent attackers to cause a segmentation fault or potentially execute arbitrary code via a specially crafted network packet containing a field whose length exceeds the maximum expected value.This issue affects Archer AX53 v1.0: through 1.3.1 Build 20241120.
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Analysis
by VulDB Data Team • 03/16/2026
The heap-based buffer overflow vulnerability identified as CVE-2025-62405 resides within the tmpserver modules of TP-Link Archer AX53 v1.0 router firmware versions through 1.3.1 Build 20241120. This critical security flaw manifests when the device processes network packets containing fields with lengths exceeding maximum expected values, creating a condition where adjacent authenticated attackers can exploit this weakness to trigger system instability or achieve remote code execution. The vulnerability operates at the heap memory management level, where insufficient bounds checking allows malicious data to overwrite adjacent memory regions, potentially corrupting program execution flow and system stability.
The technical implementation of this vulnerability stems from inadequate input validation within the tmpserver module responsible for handling network communications. When processing specially crafted network packets, the system fails to properly validate field lengths against predetermined maximum values, allowing attackers to supply data exceeding allocated buffer space. This flaw specifically affects the heap memory allocation mechanism where dynamic memory regions are manipulated without proper boundary enforcement, creating opportunities for memory corruption that can be leveraged to manipulate program control flow. The vulnerability operates under CWE-121 heap-based buffer overflow conditions, where insufficient control of data boundaries leads to memory corruption and potential code execution.
Operational impact of this vulnerability extends beyond simple system crashes to potentially enabling full system compromise when exploited by authenticated adjacent attackers. The segmentation fault conditions can cause device instability and service disruption, while the potential for arbitrary code execution opens pathways for persistent malware deployment, network reconnaissance, and privilege escalation. Attackers exploiting this vulnerability could gain unauthorized access to the router's administrative interface, potentially leading to complete network compromise. The adjacent network access requirement means attackers must be physically present within the router's wireless range or connected to the same network segment, but this limitation does not prevent exploitation given the potential for network-based attacks through compromised devices or insider threats.
Mitigation strategies for CVE-2025-62405 should prioritize immediate firmware updates from TP-Link to address the heap buffer overflow in tmpserver modules, as recommended by the vendor's security advisory. Network administrators should implement strict network segmentation and access controls to limit adjacent network access to critical infrastructure devices. Additional defensive measures include monitoring network traffic for anomalous packet patterns that might indicate exploitation attempts, implementing intrusion detection systems with signature-based detection for known attack patterns, and maintaining regular security assessments of network devices. The vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter, where successful exploitation could enable attackers to execute arbitrary commands on the affected device, potentially leading to broader network infiltration and lateral movement. Organizations should also consider implementing network access control lists to restrict communication with affected devices and maintain detailed logs of network activities for threat hunting and incident response purposes.