CVE-2025-67188: totolink a950rg_firmware Classic Buffer Overflow

Vulnerability summary

CVE-2025-67188 is a critical (CVSS 9.8) Classic Buffer Overflow vulnerability in totolink a950rg_firmware. EPSS estimates a 0.69% chance of exploitation in the next 30 days, higher than 52.2% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 03-02-2026
   PublishedVulnerability first disclosed.
2. 05-02-2026
   Last modifiedVulnerability information updated.

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.

• CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.