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.
History

Fri, 14 Nov 2025 09:30:00 +0000

Type Values Removed Values Added
First Time appeared Totolink
Totolink a720r
Totolink a720r Firmware
Vendors & Products Totolink
Totolink a720r
Totolink a720r Firmware

Thu, 13 Nov 2025 18:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-121
Metrics cvssV3_1

{'score': 5.1, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Thu, 13 Nov 2025 15:45:00 +0000

Type Values Removed Values Added
Description 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.
References

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2025-11-13T00:00:00.000Z

Updated: 2025-11-13T17:27:56.985Z

Reserved: 2025-09-26T00:00:00.000Z

Link: CVE-2025-60685

cve-icon Vulnrichment

Updated: 2025-11-13T17:27:40.653Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-11-13T16:15:52.470

Modified: 2025-11-14T16:42:03.187

Link: CVE-2025-60685

cve-icon Redhat

No data.