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CVE-2013-3366: TRENDnet TEW-812DRU firmware allows hidden TELNET access

CVE-2013-3366 · published 6 years ago

Summary

The TEW-812DRU router firmware includes an undocumented TELNET service that can be reached through a hidden web page. If an attacker knows the secret password, they could log in remotely and control the device. Update the firmware to the latest version or disable TELNET if it is not needed.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software

Vendor	Product	Affected versions
trendnet	tew-812dru_firmware	All versions `cpe:2.3:o:trendnet:tew-812dru_firmware:-:::::::*`

Original advisory text

Undocumented TELNET service in TRENDnet TEW-812DRU when a web page named backdoor contains an HTML parameter of password and a value of j78G¬DFdg_24Mhw3.

References

https://www.ise.io/casestudies/exploiting-soho-routers/ Mitigation Third Party Advisory
https://www.ise.io/soho_service_hacks/ Mitigation Third Party Advisory
https://www.ise.io/wp-content/uploads/2017/07/soho_techreport.pdf Third Party Advisory

Fix within

Internet-facing 14 days

Internal At next upgrade

Not known to be exploited
Needs hands-on effort to exploit (estimated)
Gives an attacker full control (estimated)

Severity

8.8 High

Exploitation

<1% chance of attack within 30 days

Type

CWE-352Cross-Site Request Forgery (CSRF)

Timeline

Published13 Nov 2019

Updated3 Nov 2026

First seen29 Sep 2026

Sources

CVE-2013-3366 · NVD

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