Totolink LR1200GB/NR1800X 9.1.0u Web Interface cstecgi.cgi sprintf lang stack-based overflow

Summaryinfo

A vulnerability was found in Totolink LR1200GB and NR1800X 9.1.0u. It has been rated as critical. This affects the function sprintf of the file cstecgi.cgi of the component Web Interface. Performing a manipulation of the argument lang results in stack-based overflow. This vulnerability is reported as CVE-2025-60684. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Totolink LR1200GB and NR1800X 9.1.0u. It has been classified as critical. This affects the function sprintf of the file cstecgi.cgi of the component Web Interface. The manipulation of the argument lang with an unknown input leads to a stack-based overflow vulnerability. CWE is classifying the issue as CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

This vulnerability is uniquely identified as CVE-2025-60684 since 09/26/2025. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/13/2025).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• Totolink

Name

• LR1200GB
• NR1800X

Version

• 9.1.0u

License

• commercial

Website

• Vendor: https://www.totolink.net/

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