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CVE-2026-82542 – Unauthenticated Buffer Overflow (RCE/DoS) – Tenda HG10 Firmware 300001138 (Boa Web

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Summary

CVE-2026-82542 is a critical buffer overflow vulnerability in the Boa web server component embedded in Tenda HG10 firmware (version 300001138). The flaw resides in the formIPv6Routing handler, where the destNet request parameter is copied into a fixed-size buffer without proper length validation, leading to memory corruption. The issue is remotely exploitable without authentication and carries a maximum CVSS v3.1 score of 10.0.

Technical details

  • Root cause: The formIPv6Routing function in the device’s Boa-hosted web management interface fails to validate or bound the length of the destNet argument before copying it into a stack buffer.
  • Trigger conditions: An attacker sends a crafted HTTP request to the /boaform/formIPv6Routing endpoint with an oversized destNet value.
  • Attack vector: Network — no authentication or user interaction is required to reach the vulnerable handler.
  • Impact: Memory corruption that can crash the Boa web server process and potentially allow arbitrary code execution on the device, resulting in full compromise of confidentiality, integrity, and availability.

Affected software

  • Tenda HG10 firmware version 300001138 (Boa Web Server component)

Severity

  • CVSS v3.1 Base Score: 10.0 (Critical)
  • Vector: AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: No vendor patch is referenced in the public record for this CVE as of publication. Check Tenda’s official support channels for a firmware update addressing this issue before applying any fix.
  • If no patch is available:
    • Do not expose the HG10’s web management interface (Boa server) to the internet; restrict access to trusted LAN/management networks only.
    • Place management interfaces behind a VPN or firewall ACL that blocks inbound access to the device’s HTTP management port from untrusted networks.
    • Monitor for unusual POST requests to IPv6 routing configuration endpoints and for unexpected device reboots or crashes, which may indicate exploitation attempts.
    • Where possible, disable remote/WAN management on the device.

References

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