TI-2025-37758 Aliases CVE-2025-60685 GHSA-273x-ghvh-vxh2

A stack buffer overflow exists in the ToToLink A720R Router firmware…

MEDIUM 58CWE-121Published 2025-11-13 · Updated 2026-07-05

Key facts

Attack vector: Local
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: Low · None · Low
Fix status: No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00238 14th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:o:totolink:a720r_firmware:4.1.5cu.614_b20230630:::::::*	4.1.5cu.614_b20230630	Vulnerable	TOTOLINK
cpe:2.3:h:totolink:a720r:-:::::::*	not specified by NVD	Running on	TOTOLINK

cpe:2.3:o:totolink:a720r_firmware:4.1.5cu.614_b20230630:*:*:*:*:*:*:* Versions 4.1.5cu.614_b20230630 Vulnerable ·TOTOLINK
cpe:2.3:h:totolink:a720r:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·TOTOLINK

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2025-60685
2026-10-03 Alias added: GHSA-273x-ghvh-vxh2

References

Exploit 1

https://github.com/yifan20020708/SGTaint-0-day/blob/main/ToToLink/ToToLink-A720R/CVE-2025-60685.md

Other 1

https://www.totolink.net/

TI-2025-08527 TOTOLINK A720R cstecgi.cgi setParentalRules buffer overflow CVSS 4.0HIGH 8.7
TI-2025-37756 A command injection vulnerability exists in the ToToLink A720R Router firmware… CVSS 3.1MEDIUM 6.5
TI-2025-37755 A command injection vulnerability exists in the ToToLink A720R Router firmware… CVSS 3.1MEDIUM 6.5
TI-2025-03802 TOTOLINK A720R cstecgi.cgi information disclosure CVSS 4.0MEDIUM 6.9
TI-2025-03801 TOTOLINK A720R Config cstecgi.cgi information disclosure CVSS 4.0MEDIUM 6.9
TI-2025-03800 TOTOLINK A720R Log cstecgi.cgi access control CVSS 4.0MEDIUM 6.9

See all 27 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences