CVE-2026-77217 MEDIUM

CVE-2026-77217: PLANET GS-4210-16P2S Stack Buffer Overflow and NULL Pointer Dereference via dispatcher.cgi RADIUS Handlers

Vendor Planet Technology Corp.
Product PLANET GS-4210-16P2S
Weakness CWE-121
Published August 28, 2026
Last update August 28, 2026

CVSS base score

6.9/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

What the vulnerability does

01Description

PLANET GS-4210-16P2S firmware before 3.441b260626 contains authenticated stack buffer overflow and null pointer dereference vulnerabilities in /cgi-bin/dispatcher.cgi. The web_radiusSrv*_post family of handlers copies the radKey, radKey_0, radDftParamKey, radName, and radIp POST parameters into fixed-size stack buffers without length validation, and additionally dereferences radName and radIp without verifying their presence in the request. A remote authenticated attacker can send crafted requests to crash the CGI process or web management service, resulting in denial of service.

Key dates

02Disclosure timeline

August 28, 2026 CVE published