CVE-2025-14631 Overview
A NULL Pointer Dereference vulnerability exists in TP-Link Archer BE400 V1 router's 802.11 wireless modules that allows an adjacent network attacker to cause a denial-of-service (DoS) condition by triggering a device reboot. This firmware vulnerability in the wireless subsystem can be exploited without authentication, enabling attackers within wireless range to repeatedly crash the device and disrupt network connectivity.
Critical Impact
Adjacent network attackers can exploit this vulnerability to repeatedly crash and reboot the TP-Link Archer BE400 router, causing persistent denial of service for all connected devices and disrupting network availability.
Affected Products
- TP-Link Archer BE400 V1 - Firmware version 1.1.0 Build 20250710 rel.14914
- TP-Link Archer BE400 802.11 wireless modules
Discovery Timeline
- 2026-01-07 - CVE-2025-14631 published to NVD
- 2026-01-08 - Last updated in NVD database
Technical Details for CVE-2025-14631
Vulnerability Analysis
This vulnerability stems from improper null pointer handling within the 802.11 wireless module processing code of the TP-Link Archer BE400 router. When the device receives specially crafted network traffic, the firmware fails to properly validate pointer references before dereferencing them, resulting in a null pointer dereference condition (CWE-476).
The attack requires adjacent network access, meaning the attacker must be within wireless range or on the same local network segment as the vulnerable router. No authentication or user interaction is required to exploit this vulnerability. Successful exploitation results in an immediate device crash and automatic reboot, causing complete loss of network connectivity for all connected clients during the restart cycle.
The vulnerability specifically affects the 802.11 wireless protocol handling components, suggesting the issue occurs during wireless frame processing or management frame handling. This type of vulnerability in embedded network devices is particularly concerning as it can be exploited repeatedly to maintain a persistent denial of service condition.
Root Cause
The root cause is a NULL Pointer Dereference (CWE-476) in the 802.11 wireless module firmware. The code fails to perform adequate null checks on pointer variables before dereferencing them, allowing an attacker to trigger a crash by sending inputs that cause the code path to access an uninitialized or null pointer. This is a common vulnerability pattern in embedded systems where memory safety checks may be omitted for performance reasons.
Attack Vector
The attack is executed from an adjacent network position, requiring the attacker to be within wireless range or on the same local network segment. The attacker sends specially crafted network traffic to the router's wireless interface, targeting the vulnerable 802.11 module processing code. No authentication credentials are required, and no user interaction is needed. The malformed traffic causes the null pointer dereference, crashing the device and forcing an automatic reboot.
The exploitation mechanism targets the wireless subsystem's frame processing functionality. When the malformed data is processed, the code attempts to dereference a null pointer, resulting in a fatal exception that triggers the device's watchdog timer or error handling routine to initiate a reboot.
Detection Methods for CVE-2025-14631
Indicators of Compromise
- Unexpected and repeated router reboots without administrative action or power issues
- Gaps in router system logs corresponding to crash events
- Connected devices experiencing periodic network disconnections
- Unusual wireless traffic patterns originating from nearby sources
Detection Strategies
- Monitor router uptime metrics and alert on unexpected reboot events
- Implement network monitoring to detect anomalous traffic patterns targeting the router's wireless interface
- Configure SNMP traps or syslog forwarding to capture device restart events for centralized monitoring
- Deploy wireless intrusion detection systems (WIDS) to identify malformed 802.11 frames
Monitoring Recommendations
- Enable verbose logging on the router if supported and forward logs to a SIEM solution
- Monitor for patterns of repeated device restarts that may indicate active exploitation
- Track wireless client connection/disconnection events that correlate with router reboots
- Implement uptime monitoring with alerting thresholds for network infrastructure devices
How to Mitigate CVE-2025-14631
Immediate Actions Required
- Check the current firmware version on affected TP-Link Archer BE400 routers
- Visit the TP-Link Firmware Download page to obtain the latest firmware update
- Review the TP-Link firmware update FAQ for guidance on the update process
- Consider implementing network segmentation to limit adjacent network attack surface
- Monitor for security advisories from TP-Link regarding patched firmware versions
Patch Information
TP-Link has provided firmware resources for the Archer BE400 router. Administrators should download the latest available firmware from the official TP-Link support page and apply updates following TP-Link's documented firmware upgrade procedures. Ensure the firmware version is newer than 1.1.0 Build 20250710 rel.14914 to address this vulnerability.
Workarounds
- Limit physical proximity access to reduce adjacent network attack surface where feasible
- Implement MAC address filtering as an additional layer of access control (note: this is bypassable but adds friction)
- Consider deploying a separate firewall or intrusion prevention system between the router and critical network segments
- Reduce wireless signal strength to limit the range from which the attack can be launched
- Enable scheduled reboots during maintenance windows to minimize impact of potential exploitation
# Firmware verification example
# After downloading firmware, verify the file integrity if a checksum is provided
# Check current firmware version in router admin panel: System Tools > Firmware Upgrade
# Compare installed version against 1.1.0 Build 20250710 rel.14914 (vulnerable)
# Install firmware version newer than the affected build
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
