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The HTTP parser in Tapo C220 v1 and C520WS v2 cameras contains a flaw in its error-handling logic. When the parser receives a request with an excessively long URL path, it correctly identifies the URL as invalid. However, the subsequent error-handling path proceeds to execute cleanup code that unconditionally assumes specific memory buffers have been successfully allocated. Because the error was triggered before allocation, these buffers do not exist. This results in the cleanup routine attempting to operate on invalid memory, causing a null pointer dereference or memory access violation. This crash forces the main service process to terminate, leading to a device restart. An unauthenticated attacker on the adjacent network can exploit this by repeatedly sending such malformed requests, causing continuous service crashes or reboots and rendering the camera unavailable for surveillance .
dailycve form:
Platform: Tapo Cameras
Version: C220 v1, C520WS v2
Vulnerability : Denial of Service
Severity: High
date: 2026-01-27
Prediction: 2026-01-28
What Undercode Say:
Analytics:
CVSS v4.0 Score: 7.1 (High) – Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Root Cause: Improper input validation (CWE-20) leading to unsafe error-handling path .
Bash Commands/Codes:
Example of network segmentation using iptables to restrict access Allow only a specific management host (192.168.1.10) to access the camera on port 80 iptables -A FORWARD -s 192.168.1.10 -d 192.168.100.0/24 -p tcp --dport 80 -j ACCEPT Drop all other traffic to the camera's HTTP port iptables -A FORWARD -d 192.168.100.0/24 -p tcp --dport 80 -j DROP
Source:
How Exploit:
- Attacker on the same local network crafts an HTTP request with an abnormally long URL path (e.g.,
GET /[very long string of characters] HTTP/1.1). - The unauthenticated request is sent to the camera’s IP address on port 80.
- The camera’s HTTP parser fails due to the excessive length and enters an error-handling routine.
- The cleanup code in this routine attempts to access or free memory buffers that were never allocated because of the early failure.
- This causes a crash of the main service process and forces the camera to reboot .
Protection from this CVE:
- Patch: Update Tapo C220 v1 to firmware version 1.4.2 Build 251112 or later. Update Tapo C520WS v2 to firmware version 1.2.3 Build 251114 or later .
- Mitigate: Isolate IoT devices like cameras on a separate VLAN with strict firewall rules to limit which hosts can communicate with them .
Impact:
An unauthenticated attacker can repeatedly crash the camera service or force the device to reboot. This creates a persistent denial-of-service condition, resulting in loss of video surveillance and creating security blind spots .
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Sources:
Reported By: nvd.nist.gov
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