CVE-2025-4999: Linksys FGW3000-AH/FGW3000-HK HTTP POST Request sysconf.cgi sub_4153FC command injection

Vulnerability summary

CVE-2025-4999 is a critical (CVSS 9.8) Injection vulnerability in linksys fgw3000-ah_firmware. EPSS estimates a 6.87% chance of exploitation in the next 30 days, higher than 94% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 20-05-2025
   PublishedVulnerability first disclosed.
2. 21-05-2025
   Last modifiedVulnerability information updated.

Description

A vulnerability was found in Linksys FGW3000-AH and FGW3000-HK up to 1.0.17.000000 and classified as critical. Affected by this issue is the function sub_4153FC of the file /cgi-bin/sysconf.cgi of the component HTTP POST Request Handler. The manipulation of the argument supplicant_rnd_id_en leads to command injection. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

• 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.