Description
A stack buffer overflow vulnerability exists in the ToToLink LR1200GB (V9.1.0u.6619_B20230130) and NR1800X (V9.1.0u.6681_B20230703) Router firmware within the cstecgi.cgi binary (setDefResponse function). The binary reads the "IpAddress" parameter from a web request and copies it into a fixed-size stack buffer using strcpy() without any length validation. Maliciously crafted input can overflow the buffer, leading to potential arbitrary code execution or memory corruption, without requiring authentication.
Affected products
totolink: lr1200gb firmware; totolink: lr1200gb; totolink: nr1800x firmware; totolink: nr1800x
References2
- github.com/yifan20020708/SGTaint-0-day/blob/main/ToToLink/ToToL… ExploitThird Party Advisory
- www.totolink.net/ Product
Metrics
- CVSS 3.1
-
6.5
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L - EPSS — exploit probability
- 1% percentile: 46 · as of 11 November 2026
- CWE
- CWE-121
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