CVE-2023-6906: Totolink A7100RU HTTP POST Request main buffer overflow

Vulnerability summary

CVE-2023-6906 is a high (CVSS 10.0) Classic Buffer Overflow vulnerability in totolink a7100ru_firmware. EPSS estimates a 1.85% chance of exploitation in the next 30 days, higher than 78.9% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 18-12-2023
   PublishedVulnerability first disclosed.
2. 07-05-2025
   Last modifiedVulnerability information updated.

Description

A vulnerability, which was classified as critical, was found in Totolink A7100RU 7.4cu.2313_B20191024. Affected is the function main of the file /cgi-bin/cstecgi.cgi?action=login of the component HTTP POST Request Handler. The manipulation of the argument flag with the input ie8 leads to buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. The identifier of this vulnerability is VDB-248268. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.

• 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.