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The vulnerability, identified as CVE-2026-3814, is a critical buffer overflow found in the UTT HiPER 810G router firmware up to version 1.7.7-1711. The flaw resides in the `strcpy` function within the `/goform/getOneApConfTempEntry` file. The `strcpy` function is inherently unsafe as it does not perform bounds checking on the data it copies. By manipulating an input to this endpoint, an attacker can cause the function to write more data into a buffer than it can hold, overflowing into adjacent memory. This overflow can corrupt the program’s memory, potentially allowing an attacker to overwrite critical data or inject and execute arbitrary malicious code. The attack can be initiated remotely over the network, and a proof-of-concept exploit has been made public, increasing the risk of widespread exploitation. The vulnerability has a CVSS base score indicating high severity, with impacts on system confidentiality, integrity, and availability .
dailycve form:
Platform: UTT HiPER 810G
Version: 1.7.7-1711 and below
Vulnerability : Remote Buffer Overflow
Severity: Critical
date: March 9 2026
Prediction: 30-60 days
What Undercode Say:
Analytics:
The public availability of an exploit for CVE-2026-3814 significantly increases the risk of mass exploitation by automated botnets and threat actors. Given the device’s role as a network gateway, a successful compromise could lead to a complete takeover, allowing attackers to monitor traffic, pivot to internal networks, or add the router to a botnet for DDoS attacks. The vulnerability’s remote and unauthenticated nature makes it particularly dangerous for any organization still using this end-of-life or unpatched firmware.
Bash Commands and Codes:
Example of using curl to test for the vulnerability (Proof-of-Concept)
Replace <ROUTER_IP> with the target's IP address.
This command sends a long string of 'A's to the vulnerable endpoint.
A successful crash or anomalous response may indicate vulnerability.
curl -v "http://<ROUTER_IP>/goform/getOneApConfTempEntry" \
-d "input=$(python3 -c 'print("A" 5000)')"
Example of a simple Python script to generate a pattern for offset discovery
This pattern helps in identifying the exact point of control over the instruction pointer.
python3 -c 'from pwn import cyclic; print(cyclic(1024).decode("utf-8"))'
Example of how an attacker might attempt to leverage the overflow
after identifying a return address (hypothetical).
This is for educational purposes only.
curl -v "http://<ROBOT_IP>/goform/getOneApConfTempEntry" \
--data-binary @payload.bin
Exploit:
The exploit targets the `/goform/getOneApConfTempEntry` endpoint. By sending a specially crafted HTTP POST request with an overly long input for a parameter that is passed to the `strcpy` function, an attacker can trigger the buffer overflow. With precise control over the data, the attacker can overwrite the return address on the stack and redirect execution to shellcode placed within the same request, achieving remote code execution with the privileges of the web server (often root) .
Protection from this CVE:
- Patch: Apply the official firmware update from UTT Technologies as soon as it is released. This is the primary and most effective solution.
- Network Segmentation: Isolate affected UTT HiPER 810G devices from untrusted networks, especially the internet, to reduce the attack surface .
- Access Control: If the device must remain accessible, restrict access to the management interface to only trusted internal IP addresses using firewall rules .
- Monitor: Watch for unusual network traffic targeting the `/goform/getOneApConfTempEntry` endpoint, which could indicate scanning or exploitation attempts .
- Decommission: As a long-term measure, consider replacing end-of-life devices like the HiPER 810G with newer, supported hardware that receives regular security updates .
Impact:
Successful exploitation of CVE-2026-3814 can lead to a total compromise of the confidentiality, integrity, and availability of the affected router . An attacker could gain full administrative control, allowing them to:
– Monitor and capture all network traffic passing through the device.
– Modify routing tables or DNS settings to redirect users to malicious sites.
– Use the device as a foothold to launch further attacks against internal systems.
– Render the device inoperable, causing a denial of service (DoS) for the entire network segment .
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Sources:
Reported By: nvd.nist.gov
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