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 (sub_42F32C function). The web interface reads the "lang" parameter and constructs Help URL strings using sprintf() into fixed-size stack buffers without proper length validation. Maliciously crafted input can overflow these buffers, potentially leading to 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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