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.
2025-11-13T16:15:52.590
2025-11-19T17:41:28.740
Analyzed
CVSSv3.1: 5.1 (MEDIUM)
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Operating System | totolink | a720r_firmware | 4.1.5cu.614_b20230630 | Yes |
| Hardware | totolink | a720r | - | No |
| Operating System | totolink | lr1200gb_firmware | 9.1.0u.6619_b20230130 | Yes |
| Hardware | totolink | lr1200gb | - | No |
| Operating System | totolink | nr1800x_firmware | 9.1.0u.6681_b20230703 | Yes |
| Hardware | totolink | nr1800x | - | No |