Medium severity · published Nov 13, 2025
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)
5.1
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 15% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AF
A720r Firmware · Totolink
4.1.5cu.614_b20230630 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-60685
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-60685
Exploit
https://github.com/yifan20020708/SGTaint-0-day/blob/main/ToToLink/ToToLink-A720R/CVE-2025-60685.md
Product
https://www.totolink.net/
More from A720r Firmware
9.8
CVE-2025-9303
TOTOLINK A720R cstecgi.cgi setParentalRules buffer overflow
9.8
CVE-2023-23064
TOTOLINK A720R V4.1.5cu.532_ B20210610 is vulnerable to Incorrect Access Control
9.8
CVE-2021-45742
TOTOLINK A720R v4.1.5cu.470_B20200911 was discovered to contain a command injection vulnerability in the "Main" function
9.8
CVE-2021-45740
TOTOLINK A720R v4.1.5cu.470_B20200911 was discovered to contain a stack overflow in the setWiFiWpsStart function
9.8
CVE-2021-44247
Totolink devices A3100R v4.1.2cu.5050_B20200504, A830R v5.9c.4729_B20191112, and A720R v4.1.5cu.470_B20200911 were discovered to contain command injection vulnerability in the…