CVE-2026-44089: Buffer Overflow in Totolink EX1200L router

Severity: critical (CVSS 9.4 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-23 · updated 2026-10-25
Weakness: CWE-121

Description

Totolink EX1200L router is vulnerable to Buffer Overflow in the login functionality in cgi-bin/cstecgi.cgi endpoint. This vulnerability could be exploited to cause the program to crash and to execute code remotely. This allows the attacker to perform actions as root including reading and editing data, as well as bricking the router. Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 9.3.5u.6146_B20201023 but may also affect other versions.

Affected products

TOTOLINK EX1200L: 9.3.5u.6146_B20201023

References

https://cert.pl/en/posts/2026/06/CVE-2026-44089
https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/217/ids/36.html

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