CVE-2026-77217

Medium

Description

PLANET GS-4210-16P2S V3 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.

SeverityMedium

CVSS4.9

Exploit probability—

ProductPLANET GS-4210-16P2S V3

PublishedAug 28, 2026

First seenAug 28, 2026

Weakness typeCWE-121CWE-121 CWE-476NULL pointer dereference

How to fix

Update

PLANET Technology Corp. PLANET GS-4210-16P2S V33.441b260626 or later

Patches

planet.com.tw/en/support/security-advisory/10

Affected products

Product	Affected versions	Fixed in
PLANET Technology Corp. PLANET GS-4210-16P2S V3	v < 3.441b260626	3.441b260626

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