CVE-2025-59482: TP-Link Archer AX53 Buffer Overflow Flaw

CVE-2025-59482 Overview

A heap-based buffer overflow vulnerability has been identified in the TP-Link Archer AX53 v1.0 router, specifically within the tmpserver modules. This vulnerability allows authenticated attackers on an adjacent network to cause a segmentation fault or potentially execute arbitrary code by sending specially crafted network packets containing fields that exceed the maximum expected length values.

Critical Impact

Authenticated adjacent network attackers can exploit this heap overflow to crash the device or potentially gain arbitrary code execution capabilities on affected TP-Link Archer AX53 routers.

Affected Products

• TP-Link Archer AX53 v1.0 firmware through version 1.3.1 Build 20241120
• TP-Link Archer AX53 v1.0 tmpserver modules
• TP-Link Archer AX53 v1.0 network processing components

Discovery Timeline

• 2026-02-03 - CVE-2025-59482 published to NVD
• 2026-02-04 - Last updated in NVD database

Technical Details for CVE-2025-59482

Vulnerability Analysis

This vulnerability is classified as CWE-122 (Heap-based Buffer Overflow), a memory corruption issue that occurs when data is written beyond the allocated boundaries of a heap buffer. The flaw exists within the tmpserver modules of the TP-Link Archer AX53 router firmware.

When the router processes incoming network packets, certain fields are expected to conform to predefined length constraints. However, the vulnerable code fails to properly validate the length of these fields before copying data into a heap-allocated buffer. An attacker who has authenticated to the router and is positioned on the adjacent network can craft malicious packets with oversized field values that overflow the destination buffer.

The exploitation requires adjacent network access (the attacker must be on the same network segment as the target device) and valid authentication credentials, which somewhat limits the attack surface. However, once these prerequisites are met, successful exploitation can result in denial of service through a segmentation fault or, in more severe scenarios, arbitrary code execution with the privileges of the vulnerable process.

Root Cause

The root cause of this vulnerability lies in insufficient bounds checking within the tmpserver modules when processing network packet fields. The code allocates a fixed-size heap buffer based on expected maximum field lengths but fails to validate that incoming data actually conforms to these constraints before performing memory copy operations. This lack of input validation allows attackers to supply oversized data that overflows the allocated buffer.

Attack Vector

The attack requires an authenticated attacker positioned on the adjacent network to send specially crafted network packets to the vulnerable TP-Link Archer AX53 router. The attacker must include a field with a length value that exceeds the maximum expected by the tmpserver modules. When processed, this oversized field causes heap memory corruption.

The vulnerability mechanism involves the following sequence:

1. An authenticated attacker on the adjacent network constructs a malicious network packet
2. The packet contains a field with length exceeding expected maximum values
3. The tmpserver module processes the packet without proper length validation
4. Data is copied into a heap buffer, overflowing its boundaries
5. This results in heap corruption leading to segmentation fault or potential code execution

For detailed technical information, refer to the Talos Intelligence Vulnerability Reports and the TP-Link FAQ on Archer AX53.

Detection Methods for CVE-2025-59482

Indicators of Compromise

• Unexpected router crashes or reboots, particularly segmentation faults in tmpserver processes
• Anomalous network traffic patterns from authenticated clients targeting the router's internal services
• Unusual process behavior or memory consumption spikes on the affected router
• Log entries indicating malformed packet processing failures or buffer-related errors

Detection Strategies

• Monitor network traffic for anomalous packet sizes or malformed packets targeting TP-Link router services from adjacent network hosts
• Implement network-based intrusion detection rules to identify packets with field lengths exceeding normal operational parameters
• Deploy SentinelOne Singularity for endpoint visibility and behavioral detection on networks containing vulnerable devices
• Analyze router logs for repeated authentication attempts followed by service crashes or abnormal terminations

Monitoring Recommendations

• Enable verbose logging on TP-Link Archer AX53 routers to capture packet processing errors and service crashes
• Deploy network monitoring solutions to track traffic patterns between authenticated clients and router management interfaces
• Establish baseline metrics for router memory usage and process stability to detect anomalous behavior
• Configure alerts for unexpected router service restarts or core dumps

How to Mitigate CVE-2025-59482

Immediate Actions Required

• Update TP-Link Archer AX53 v1.0 firmware to the latest available version beyond 1.3.1 Build 20241120
• Restrict network access to the router's management interfaces to trusted administrative hosts only
• Review and limit authenticated user accounts on the router to reduce potential attack vectors
• Implement network segmentation to limit adjacent network attack surface where possible

Patch Information

TP-Link has released firmware updates to address this vulnerability. Users should download and install the latest firmware from the official TP-Link Firmware Download page. Ensure that the installed firmware version is newer than 1.3.1 Build 20241120 to remediate this heap-based buffer overflow vulnerability.

Workarounds

• Limit authenticated user access to the router to reduce the pool of potential attackers
• Implement strict network access controls to prevent untrusted devices from joining the adjacent network
• Monitor router behavior closely for signs of exploitation attempts while awaiting firmware update deployment
• Consider temporarily disabling non-essential services or features that may utilize the affected tmpserver modules if operationally feasible

Administrators should apply firmware updates as the primary mitigation strategy. For additional guidance, consult the TP-Link FAQ on Archer AX53 documentation.