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CVE-2026-82693 – Unauthenticated Telnet Enablement (Missing Authentication) – Tenda AC1206 15.03.06.

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Summary

CVE-2026-82693 is a missing authentication vulnerability in the Tenda AC1206 wireless router, affecting firmware version 15.03.06.23. The flaw resides in the TendaTelnet function of the /goform/telnet endpoint in the router’s Web UI, allowing an attacker to invoke the endpoint without any credential verification. The issue carries a maximum CVSS score of 10.0 and a public exploit is available.

Technical details

  • Root cause: the /goform/telnet handler, which implements the TendaTelnet function, does not enforce authentication before processing requests.
  • Trigger condition: sending a crafted request to /goform/telnet on the device’s management interface, with no valid session or credentials required.
  • Attack vector: network-based, remotely exploitable, no user interaction and no privileges needed.
  • Impact: an unauthenticated remote attacker can enable/manipulate the telnet service on the device, potentially gaining shell-level access and full compromise of confidentiality, integrity, and availability.

Affected software

  • Tenda AC1206 — firmware version 15.03.06.23

Severity

  • CVSS v3.1 Base Score: 10.0 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: No vendor patch has been confirmed as available at time of publication; check Tenda’s official site/support channels for a firmware update addressing this issue and apply it as soon as it is released.
  • If no patch: Disable remote/WAN management access to the router’s Web UI, restrict access to the management interface to trusted internal networks only, and place the device behind a firewall or VPN. Monitor for unexpected telnet service activation and disable telnet functionality where not required.

References

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