CVE-2026-77217

MEDIUM 4.9

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

CVSS Score

4.9

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-121 CWE-476
Vendor	planet technology corp.
Product	planet gs-4210-16p2s
Published	Aug 28, 2026

Stay Ahead of the Next One

Get instant alerts for planet technology corp. planet gs-4210-16p2s

Be the first to know when new medium vulnerabilities affecting planet technology corp. planet gs-4210-16p2s are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

PLANET Technology Corp. / PLANET GS-4210-16P2S

0 < 3.441b260626

References

NVD ↗ CVE.org ↗ EPSS Data ↗

planet.com.tw: https://www.planet.com.tw/en/support/security-advisory/10 vulncheck.com: https://www.vulncheck.com/advisories/planet-gs-4210-16p2s-stack-buffer-overflow-and-null-pointer-dereference-via-dispatcher-cgi-radius-handlers

Credits

Jincheng Wang (@winmt) Professor Le Yu of Nanjing University of Posts and Telecommunications Professor Xiapu Luo of The Hong Kong Polytechnic University