CVE-2026-77217Network attack vector

Web management crash via unchecked RADIUS parameters

Published Aug 28, 2026 · Updated Aug 28, 2026

Stack buffer overflow and null pointer dereference in PLANET GS-4210-16P2S before 3.441b260626 allow remote authenticated users to crash CGI. The web_radiusSrv*_post handlers copy five POST parameters into fixed-size stack buffers without length checks and dereference radName and radIp without confirming their presence. Administrator-level web-management privileges are required; exploitation interrupts only the CGI process or web-management service.

CVSS severity6.9
Medium
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow and null pointer dereference in PLANET GS-4210-16P2S before 3.441b260626 allow remote authenticated users to crash CGI. The web_radiusSrv*_post handlers copy five POST parameters into fixed-size stack buffers without length checks and dereference radName and radIp without confirming their presence. Administrator-level web-management privileges are required; exploitation interrupts only the CGI process or web-management service.

The record

CVE
CVE-2026-77217
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
PLANET Technology Corporation
Product
PLANET GS-4210-16P2S
Classifications
CWE-121, CWE-476, T1499
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <3.441b260626

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

PLANET Technology Corporation · PLANET GS-4210-16P2Sversion=0 <3.441b260626

Published CVSS scores

6.9PLANET Technology CorporationCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
4.9PLANET Technology CorporationCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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