Buffer overflow in Totolink A720r
CVE-2025-60686
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.
Vulnerability class: Buffer Overflow
EPSS: 0.002 (12.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.1 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L.
Affected products
- Totolink A720r
- Totolink A720r_firmware — versions 4.1.5cu.614_b20230630
- Totolink Lr1200gb
- Totolink Lr1200gb_firmware — versions 9.1.0u.6619_b20230130
- Totolink Nr1800x
- Totolink Nr1800x_firmware — versions 9.1.0u.6681_b20230703
- N/a — versions n/a
Weakness classification (CWE)
References
- cve@mitre.org (Broken Link)
- cve@mitre.org (Product)
- cve@mitre.org (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2025-60686?
- CVE-2025-60686 is a medium-severity vulnerability in Totolink A720r, classified under Stack-based Buffer Overflow. CVSS score: 5.1/10. Published 2025-11-13.
- How severe is CVE-2025-60686?
- Medium severity. CVSS v3 base score is 5.1 out of 10.