CVE-2026-77217: Stack-based Buffer Overflow in PLANET Technology Corp. PLANET GS-4210-16P2S V3
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.
CVSS v4.0
Score 6.9medium
Affected software
PLANET Technology Corp.
PLANET GS-4210-16P2S V3
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The PLANET GS-4210-16P2S V3 firmware versions prior to 3.441b260626 have a stack-based buffer overflow and null pointer dereference vulnerability in the /cgi-bin/dispatcher.cgi component. Specifically, the web_radiusSrv*_post handlers copy POST parameters (radKey, radKey_0, radDftParamKey, radName, radIp) into fixed-size stack buffers without validating their length, and dereference radName and radIp without checking their presence. This flaw allows a remote attacker with authentication to send crafted requests that can crash the CGI process or the web management service, resulting in denial of service.
Potential Impact
An authenticated remote attacker can exploit these vulnerabilities to cause a denial of service by crashing the CGI process or the web management service on the affected device. There is no indication of code execution or data disclosure from the provided information.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch information is provided at this time. Until a patch is available, restrict access to the web management interface to trusted users and monitor for unusual crashes or service interruptions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-08-20T18:25:46.943Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a91e412acd9273b4942e89f
Added to database: 08/28/2026, 19:40:02 UTC
Last enriched: 09/07/2026, 14:18:37 UTC
Last updated: 10/12/2026, 18:48:22 UTC
Views: 87
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