What is CVE-2025-67186?

CVE-2025-67186 is a critical-severity vulnerability in Totolink A950rg, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2026-02-03.

How severe is CVE-2025-67186?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Totolink A950rg

CVE-2025-67186

TOTOLINK A950RG V4.1.2cu.5204_B20210112 contains a buffer overflow vulnerability in the setUrlFilterRules interface of /lib/cste_modules/firewall.so. The vulnerability occurs because the `url` parameter is not properly validated for length…

Vulnerability class: Buffer Overflow

EPSS: 0.007 (48.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Totolink A950rg
Totolink A950rg_firmware — versions 4.1.2cu.5204_b20210112
N/a — versions n/a

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

cve@mitre.org (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2025-67186?: CVE-2025-67186 is a critical-severity vulnerability in Totolink A950rg, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2026-02-03.
How severe is CVE-2025-67186?: Critical severity. CVSS v3 base score is 9.8 out of 10.