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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.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Page title: Tenda Web Master
  • Raw response body: an anchor element with a brand class and title="Tenda" attribute

References

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How IONIX’s External Exposure Management Platform Detects and Validates
Zero-Days to Shrink MTTR

1

Map your entire attack surface (continously)

IONIX uses multi-factor discovery methods, including DNS analysis, certificate mapping, metadata inspection, and more, to automatically map every internet-facing asset across your environment. This includes cloud instances, third-party platforms, shadow IT, and even forgotten infrastructure that traditional tools miss.

2

Monitor for new CVEs

Dozens of threat intel feeds using agentic technology are continuously analyzed to detect the appearance of proof-of-concept code, exploit kits, and indicators of active targeting. IONIX goes further by applying AI to proactively evaluate whether emerging vulnerabilities are likely to be exploited, even before PoCs go public.

3

Identify Potential External Exposures

Not all CVEs matter. IONIX filters vulnerabilities by asking attacker-centric questions: Can it be reached from the internet? Does it require authentication? Is it being exploited in the wild? This dramatically reduces noise and focuses teams on threats that can actually be weaponized.

4

Create Safe, Scalable Exploit Validations

IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

5

Execute Exploit Validations

By combining context about software stack, versioning, exposure status, and reachability, IONIX ensures that only the right payloads are executed against the right assets, maximizing efficiency and minimizing risk.

6

Drive Fast and Actionable Remediation

Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

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