Vulnerability · Published Jun 23, 2026 · Assigned by CERT-PL

CVE-2026-44089Buffer Overflow in Totolink EX1200L router

Critical 9.4

In plain English

A critical-severity stack buffer overflow in EX1200L from Totolink. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities).

Severity (CVSS 4.0)9.4Critical

Exploit odds (30 days)0.3%top 76.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
Totolink	EX1200L	9.3.5u.6146_B20201023

Weakness: CWE-121 · Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

References

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