CVE-2026-7019 Overview
CVE-2026-7019 is a buffer overflow vulnerability in the Tenda F456 router running firmware version 1.0.0.5. The flaw resides in the fromP2pListFilter function within the /goform/P2pListFilter endpoint. Attackers can trigger the overflow by manipulating the menufacturer or Go arguments sent to the vulnerable handler. The issue is exploitable remotely over the network and requires only low-privilege access. Public disclosure indicates that exploitation details are available, increasing the risk of opportunistic attacks against exposed devices. The vulnerability is classified under CWE-119, covering improper restriction of operations within memory buffer bounds.
Critical Impact
Remote attackers with low privileges can corrupt memory on affected Tenda F456 routers, potentially leading to denial of service or arbitrary code execution on the device.
Affected Products
- Tenda F456 router (hardware)
- Tenda F456 firmware version 1.0.0.5
- Deployments exposing the /goform/P2pListFilter web endpoint
Discovery Timeline
- 2026-04-26 - CVE-2026-7019 published to NVD
- 2026-04-29 - Last updated in NVD database
Technical Details for CVE-2026-7019
Vulnerability Analysis
The vulnerability exists in the fromP2pListFilter function, which handles requests submitted to the /goform/P2pListFilter web interface on the Tenda F456 router. The function processes user-supplied values from the menufacturer and Go HTTP parameters without enforcing proper length validation. When an attacker submits an oversized value, the data is copied into a fixed-size stack or heap buffer, overflowing adjacent memory. This category of flaw maps to CWE-119, improper restriction of operations within the bounds of a memory buffer. Successful exploitation can corrupt return addresses, function pointers, or control structures, leading to crashes or attacker-controlled execution flow on the embedded MIPS or ARM device. See the GitHub vulnerability report and VulDB #359598 for additional technical detail.
Root Cause
The root cause is missing bounds checking when the firmware copies HTTP request parameters into internal buffers. The fromP2pListFilter handler trusts the size of the menufacturer and Go arguments rather than enforcing a maximum length before invoking a copy operation such as strcpy or sprintf. Embedded Tenda router binaries commonly rely on unsafe C string functions inside goform handlers, and this pattern repeats here.
Attack Vector
An attacker reaches the vulnerable endpoint over the network by sending a crafted HTTP request to /goform/P2pListFilter. The request includes a malicious payload in the menufacturer or Go parameter that exceeds the destination buffer size. The attacker needs authenticated, low-privilege access to the web management interface. Devices exposing the management interface to untrusted networks face a higher risk of remote compromise.
No verified proof-of-concept code is available from authoritative sources. Refer to the VulDB CTI Report for additional exploitation context.
Detection Methods for CVE-2026-7019
Indicators of Compromise
- HTTP POST or GET requests targeting /goform/P2pListFilter containing abnormally long menufacturer or Go parameter values
- Unexpected reboots, watchdog resets, or service crashes on Tenda F456 devices following web interface activity
- Outbound connections from the router to unexpected hosts after suspicious management traffic
Detection Strategies
- Inspect web traffic destined for the router's management interface for oversized parameter values exceeding typical lengths
- Deploy network intrusion detection signatures that flag requests to /goform/P2pListFilter with parameter sizes above a safe threshold
- Correlate router crash events with preceding HTTP requests to the vulnerable endpoint using centralized syslog collection
Monitoring Recommendations
- Forward router syslog and crash telemetry to a centralized logging or SIEM platform for correlation
- Monitor authentication events on the Tenda web interface for brute force or credential-stuffing activity that could enable exploitation
- Track all administrative access to the router management plane and alert on access from non-management network segments
How to Mitigate CVE-2026-7019
Immediate Actions Required
- Restrict access to the Tenda F456 web management interface to trusted internal management VLANs only
- Disable remote WAN-side administration if it is currently enabled on affected devices
- Rotate administrative credentials and enforce strong, unique passwords to limit low-privilege attacker access
- Inventory all Tenda F456 devices running firmware 1.0.0.5 and prioritize them for remediation
Patch Information
No vendor patch has been published in the referenced advisories at the time of NVD publication. Monitor the Tenda security site for firmware updates addressing the fromP2pListFilter flaw. If a fixed firmware release becomes available, apply it through the device's standard upgrade procedure after validating in a test environment.
Workarounds
- Place affected routers behind an upstream firewall that blocks inbound access to TCP ports serving the management interface
- Use access control lists to permit management traffic only from specific administrator IP addresses
- Consider replacing end-of-life Tenda F456 hardware with a supported model if no firmware patch is released
- Segment IoT and consumer-grade networking equipment from production and sensitive network zones
# Example: block external access to the router management interface on an upstream Linux gateway
iptables -A FORWARD -p tcp -d <router_ip> --dport 80 -i <wan_iface> -j DROP
iptables -A FORWARD -p tcp -d <router_ip> --dport 443 -i <wan_iface> -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
