PLANET GS-4210-16P2S 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.
CVE-2026-77218
MEDIUMPre-NVD 4.94.9—Trending — 4 sources updated this week
EchelonGraph scoreHIGH confidence
Score 4.9 from GitHub Security Advisory published 2026-08-28. a secondary CVSS source baseline 4.9; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, secondary
4.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.9Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 4.9
- EG Score
- 4.9(high)
- EG Risk
- 27(Track)EG Risk 27/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity49% × 45%Exploitation0% × 40%Automatability30% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 0%
- EPSS %ILE
- 34%
- KEV
- Not listed
Published
August 28, 2026
Last Modified
August 28, 2026
Advisory Details (2)
Auto-updated Aug 28, 2026No patch confirmed yet.
generic
PLANET GS-4210-16P2S Stack Buffer Overflow via dispatcher.cgi Credential Handlers | Advisories | VulnCheck
https://www.vulncheck.com/advisories/planet-gs-4210-16p2s-stack-buffer-overflow-via-dispatcher-cgi-credential-handlersgeneric
PLANET GS-4210-16P2S V3 - Security Advisory - PLANET Technology
https://www.planet.com.tw/en/support/security-advisory/10Vendor Advisories for CVE-2026-77218(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 7× in last 7d / 7× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-08-30 01:22 UTCEPSS rescore
- 2026-08-29 22:40 UTCGHSA enrichment
- 2026-08-28 22:48 UTCEG score recompute
- 2026-08-28 22:48 UTCGHSA enrichment
- 2026-08-28 20:26 UTCEG score recompute
- 2026-08-28 19:40 UTCEG score recompute
- 2026-08-28 19:36 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Same CWE
10 shownCWE-121
Frequently asked(5)
What is CVE-2026-77218?
CVE-2026-77218 is a medium vulnerability published on August 28, 2026. PLANET GS-4210-16P2S firmware before 3.441b260626 contains authenticated stack buffer overflow vulnerabilities in /cgi-bin/dispatcher.cgi. The webloginfirstpost handler copies the usrPass POST parameter into a fixed-size stack buffer without length validation, the websysenablePasswdpost handler…
When was CVE-2026-77218 disclosed?
CVE-2026-77218 was first published in the National Vulnerability Database on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77218 actively exploited?
CVE-2026-77218 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 65.9% of all scored CVEs.
What is the CVSS score of CVE-2026-77218?
CVE-2026-77218 has a CVSS v3 base score of 4.9 (NVD).
How do I remediate CVE-2026-77218?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77218, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-77218
Is Your Infrastructure Affected by CVE-2026-77218?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.