Totolink A720R/LR1200GB/NR1800X infostat.cgi sscanf stack-based overflow

Summaryinfo

A vulnerability, which was classified as critical, was found in Totolink A720R, LR1200GB and NR1800X. Affected by this vulnerability is the function sscanf of the file infostat.cgi. The manipulation results in stack-based overflow. This vulnerability is identified as CVE-2025-60686. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Totolink A720R, LR1200GB and NR1800X (affected version not known). It has been classified as critical. Affected is the function sscanf of the file infostat.cgi. The manipulation 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. CVE summarizes:

A local stack-based buffer overflow vulnerability exists in the infostat.cgi and cstecgi.cgi binaries of ToToLink routers (A720R V4.1.5cu.614_B20230630, LR1200GB V9.1.0u.6619_B20230130, and NR1800X V9.1.0u.6681_B20230703). Both programs parse the contents of /proc/net/arp using sscanf() with "%s" format specifiers into fixed-size stack buffers without length validation. Specifically, one function writes user-controlled data into a single-byte buffer, and the other into adjacent small arrays without bounds checking. An attacker who controls the contents of /proc/net/arp can trigger memory corruption, leading to denial of service or potential arbitrary code execution.

This vulnerability is traded as CVE-2025-60686 since 09/26/2025. The exploitability is told to be easy. It is possible to launch the attack remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (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.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-175300). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• Totolink

Name

• A720R
• LR1200GB
• NR1800X

License

• commercial

Website

• Vendor: https://www.totolink.net/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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