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The vulnerability, designated CVE-2026-1315, resides in the firmware update mechanism of TP-Link Tapo C220 v1 and C520WS v2 cameras . The core issue is an improper ordering of operations, classified under CWE-20 (Improper Input Validation) . When the device’s firmware update endpoint receives a request, it initiates the update process by terminating core system services . This termination occurs before any verification of the user’s authentication or the cryptographic integrity of the uploaded firmware file . An unauthenticated attacker on the same network segment can exploit this by sending a crafted file—which could be invalid or malformed—to this endpoint . Because the service shutdown is triggered without validation, the camera halts its critical functions, leading to a persistent Denial of Service (DoS). The device does not automatically recover from this state; it requires manual intervention, such as a physical power cycle or a restart initiated through the Tapo mobile application, to resume normal operation .
dailycve form:
Platform: TP-Link Tapo
Version: C220(<1.4.2), C520WS(<1.2.3)
Vulnerability : Improper Input Validation
Severity: High (7.1)
date: 2026-01-27
Prediction: Patched (Fixed builds released)
What Undercode Say:
Analytics:
The vulnerability is reachable over the network and requires no privileges or user interaction. The attack complexity is low, meaning exploitation is straightforward once an attacker has network access to the device.
Check current firmware version via device's local API (example) curl -s http://<CAMERA_IP>/api/info | grep -i firmware Simulate detection by monitoring for POST requests to firmware endpoint sudo tcpdump -i <interface> -A -s 0 'host <CAMERA_IP> and port 80 and tcp[((tcp[12:1] & 0xf0) >> 2):4] = 0x504f5354' Example log of an attack attempt in web server logs grep "POST /firmware-update" /var/log/camera_access.log
Exploit:
An attacker on the local network can send a crafted HTTP POST request to the firmware update endpoint. The content of the file is irrelevant as the service crashes before its integrity is checked.
Example using curl to send a dummy file to the vulnerable endpoint This will cause the target camera to crash. curl -X POST -H "Content-Type: multipart/form-data" -F "firmware=@/path/to/any/file.bin" http://<TARGET_IP>/firmware-update
Protection from this CVE:
The primary and most effective protection is to update the device firmware to the patched versions .
– For Tapo C220 v1: Update to firmware version 1.4.2 Build 251112 or later.
– For Tapo C520WS v2: Update to firmware version 1.2.3 Build 251114 or later.
As a mitigating control until patching is possible, strict network segmentation should be implemented .
Example iptables rule on a gateway to block access to camera subnet from untrusted zones Isolate IoT devices on VLAN 10 (192.168.10.0/24) from the main network (192.168.1.0/24) iptables -A FORWARD -s 192.168.1.0/24 -d 192.168.10.0/24 -j DROP Allow only a specific management host to access cameras for administration iptables -I FORWARD -s 192.168.1.100 -d 192.168.10.0/24 -j ACCEPT Verify the camera is no longer accessible from an untrusted host ping <CAMERA_IP> Expected output: Request timeout for icmp_seq
Impact:
Successful exploitation results in a persistent Denial of Service (DoS). The affected camera becomes completely inoperative, unable to stream video, detect motion, or respond to any requests . This creates a critical security gap, effectively disabling surveillance capabilities until a user physically reboots the device or restarts it via the app. This could allow physical security breaches to go unnoticed and unrecorded .
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Sources:
Reported By: nvd.nist.gov
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