Buffer overflow in Totolink A720r
CVE-2025-60685
A stack buffer overflow exists in the ToToLink A720R Router firmware V4.1.5cu.614_B20230630 within the sysconf binary (sub_401EE0 function). The binary reads the /proc/stat file using fgets() into a local buffer and subsequently parses the line using sscanf() into a single-byte variable with the %s format specifier. Maliciously crafted /proc/stat content can overwrite adjacent stack memory, potentially allowing an attacker with filesystem write privileges to execute arbitrary code on the device.
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
- 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-2025-60685?
- CVE-2025-60685 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-2025-60685?
- Medium severity. CVSS v3 base score is 5.1 out of 10.