Buffer overflow in Planet Technology Corp. Gs-4210-16p2s
CVE-2026-77217
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (47.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.002
Affected products
Weakness classification (CWE)
References
- www.planet.com.tw/en/support/security-advisory/10 (vendor-advisory, patch)
- www.vulncheck.com/advisories/planet-gs-4210-16p2s-stack-buffer-overflow-and-nul… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-77217?
- CVE-2026-77217 is a medium-severity vulnerability in Planet Technology Corp. Gs-4210-16p2s, classified under Stack-based Buffer Overflow. CVSS score: 4.9/10. Published 2026-08-28.
- How severe is CVE-2026-77217?
- Medium severity. CVSS v3 base score is 4.9 out of 10.