Critical severity · published Feb 3, 2026
CVE-2025-67188
A buffer overflow vulnerability exists in TOTOLINK A950RG V4.1.2cu.5204_B20210112
9.8
CVSS
0.7%
EPSS
No
On KEV
Description
A buffer overflow vulnerability exists in TOTOLINK A950RG V4.1.2cu.5204_B20210112. The issue resides in the setRadvdCfg interface of the /lib/cste_modules/ipv6.so module. The function fails to properly validate the length of the user-controlled radvdinterfacename parameter, allowing remote attackers to trigger a stack buffer overflow.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 53% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AF
A950rg Firmware · Totolink
4.1.2cu.5204_b20210112 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-67188
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-67188
Exploit
https://github.com/SunnyYANGyaya/cuicuishark-sheep-fishIOT/blob/main/ToTolink/A950RG/5024-ipv6-setRadvdCfg-radvdinterfacename-buffer.md
More from A950rg Firmware
10.0
CVE-2026-116508
TOTOLINK A950RG Device-Information CGI infostat.cgi sub_402340 stack-based overflow
10.0
CVE-2026-114575
TOTOLINK A950RG product.so UploadCustomModule command injection
9.9
CVE-2026-116506
TOTOLINK A950RG firewall.so apmib_set command injection
9.9
CVE-2026-116504
TOTOLINK A950RG Cloud Upgrade upgrade.so setCloudUpgradeFW command injection
9.8
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