# CVE-2026-77217

## Summary

- **CVE ID:** CVE-2026-77217
- **Severity:** MEDIUM
- **CVSS Score:** 6.9 (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)
- **CWE:** CWE-121, CWE-476
- **Published:** Aug 28, 2026
- **Last Modified:** Sep 1, 2026

## Description

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.

## Affected Products

- PLANET Technology Corp. — PLANET GS-4210-16P2S (0)
- PLANET Technology Corp. — PLANET GS-4210-16P2S V3 (0)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.43%
- **EPSS Percentile:** 36.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._