CVE-2026-15314: Tapo P110 v1 DoS Vulnerability

CVE-2026-15314 Overview

CVE-2026-15314 affects the TP-Link Tapo P110 v1 smart Wi-Fi Plug. The device fails to properly validate the size of authenticated HTTP request bodies before performing memory copy operations. An attacker on an adjacent network can send a crafted request that triggers a buffer overflow [CWE-120] in the on-device web service. The overflow crashes the web service process, forcing it to stop responding or restart. The result is a denial-of-service condition against the plug's management interface.

Critical Impact
Adjacent-network attackers who possess valid authentication can crash the Tapo P110 v1 web service, disrupting remote control and automation of the smart plug.

Affected Products

TP-Link Tapo P110 v1 smart Wi-Fi Plug
Firmware versions prior to the vendor's published fix (see TP-Link Tapo P110 Firmware Release Notes)
Deployments where the plug is reachable on the local Wi-Fi network

Discovery Timeline

2026-08-04 - CVE-2026-15314 published to NVD
2026-08-06 - Last updated in NVD database

Technical Details for CVE-2026-15314

Vulnerability Analysis

The Tapo P110 v1 exposes an HTTP-based management service that processes authenticated requests from the Tapo mobile app and cloud service. The service copies data from the request body into fixed-size internal buffers without validating the source length. When the request body exceeds the destination buffer capacity, adjacent memory is overwritten. The overwrite corrupts control data used by the web service and causes the process to crash or be restarted by the device watchdog. During the crash window, the plug becomes unmanageable through its local API. Repeated exploitation produces a sustained denial-of-service condition against the device's control plane.

Root Cause

The root cause is insufficient input validation before a memory copy operation, classified as [CWE-120] Buffer Copy without Checking Size of Input. The vulnerable code path handles authenticated HTTP request bodies but does not enforce a maximum length check against the destination buffer.

Attack Vector

Exploitation requires adjacent-network access, meaning the attacker must be present on the same Wi-Fi network as the plug. The attacker must also hold valid credentials for the device. Once authenticated, the attacker sends an oversized HTTP body to the vulnerable endpoint to trigger the overflow and crash the web service.

No verified public exploit code is available. Refer to the TP-Link Tapo P110 Firmware Release Notes for vendor guidance.

Detection Methods for CVE-2026-15314

Indicators of Compromise

Repeated unresponsiveness of the Tapo P110 v1 device to the Tapo app or local API on port 80/TCP
Unexpected reboot cycles of the plug visible in the Tapo activity log
Wi-Fi traffic captures showing oversized HTTP POST bodies directed at the plug's IP address
Loss of scheduled automation events tied to the affected device

Detection Strategies

Monitor local network segments for HTTP requests to Tapo P110 v1 devices with abnormally large request bodies
Alert on repeated TCP resets or connection failures against the plug's management port following successful authentication
Correlate Tapo cloud disconnect events with local Wi-Fi client activity to identify potential attacker sources

Monitoring Recommendations

Enable Wi-Fi client isolation on the IoT SSID to log lateral traffic attempts toward smart plugs
Forward wireless controller and DHCP logs to a central analytics platform to track new or unauthorized devices on the IoT network
Track firmware version telemetry across the Tapo fleet to confirm patched versus vulnerable devices

How to Mitigate CVE-2026-15314

Immediate Actions Required

Update every Tapo P110 v1 plug to the latest firmware published by TP-Link
Rotate the Tapo account password and any local device credentials used to authenticate to the plug
Place smart plugs on a dedicated IoT VLAN or SSID isolated from user and server networks
Restrict Wi-Fi access to the IoT network using WPA2/WPA3 with a strong pre-shared key

Patch Information

TP-Link has published firmware for the Tapo P110 v1. Download the current release from the TP-Link Tapo P110 v1 Firmware page and apply it through the Tapo mobile app. Consult the TP-Link Tapo P110 FAQ for update procedures.

Workarounds

Enable client isolation on the Wi-Fi network hosting the plug to block peer-to-peer traffic from other clients
Restrict which devices can reach the plug's IP address using router or firewall access control lists
Disable local API access where the Tapo app supports cloud-only control, reducing the local attack surface
Remove untrusted users and previously shared accounts from the Tapo home to shrink the pool of authenticated clients

bash

# Example: isolate the Tapo P110 on an IoT VLAN using iptables on a Linux router
iptables -A FORWARD -s 192.168.10.0/24 -d 192.168.20.50 -j DROP
iptables -A FORWARD -s 192.168.30.0/24 -d 192.168.20.50 -j DROP
# Allow only the home automation controller to reach the plug
iptables -I FORWARD -s 192.168.20.10 -d 192.168.20.50 -p tcp --dport 80 -j ACCEPT