CVE-2025-9935: totolink n600r_firmware Injection

Vulnerability summary

CVE-2025-9935 is a critical (CVSS 9.8) Injection vulnerability in totolink n600r_firmware. EPSS estimates a 2.75% chance of exploitation in the next 30 days, higher than 86% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 03-09-2025
   PublishedVulnerability first disclosed.
2. 04-09-2025
   Last modifiedVulnerability information updated.

Description

A vulnerability was determined in TOTOLINK N600R 4.3.0cu.7866_B20220506. This vulnerability affects the function sub_4159F8 of the file /web_cste/cgi-bin/cstecgi.cgi. Executing manipulation can lead to command injection. The attack can be executed remotely. The exploit has been publicly disclosed and may be utilized.

• CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.
• CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.