Buffer overflow in Planet Technology Corp. Gs-4210-16p2s
CVE-2026-77218
PLANET GS-4210-16P2S V3 firmware before 3.441b260626 contains authenticated stack buffer overflow vulnerabilities in /cgi-bin/dispatcher.cgi. The web_login_first_post handler copies the usrPass POST parameter into a fixed-size stack buffer without length validation, the web_sys_enablePasswd_post handler copies the enbPass POST parameter into a fixed-size stack buffer without length validation, and the web_sys_localUser_post handler copies the usrName and usrPass POST parameters into fixed-size stack buffers without length validation. A remote authenticated attacker can send a crafted request 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 (45.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 45.7% 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-via-dis… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-77218?
- CVE-2026-77218 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-2026-77218?
- Medium severity. CVSS v3 base score is 4.9 out of 10.