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CVE-2026-77217— PLANET GS-4210-16P2S Stack Buffer Overflow and NULL Pointer Dereference via dispatcher.cgi RADIUS Handlers

Quick assessment

Affected
PLANET Technology Corp. PLANET GS-4210-16P2S
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

以下是对该漏洞描述信息的中文翻译： PLANET GS-4210-16P2S 固件版本 3.441b260626 之前的版本中， 存在经过身份验证的栈缓冲区溢出和空指针引用漏洞。 系列处理函数在未进行长度校验的情况下，将 POST 请求中的 、 、 、 和 参数直接复制到固定大小的栈缓冲区中；此外，在请求中未验证 和 是否存在的情况下，代码直接对它们进行了引用（解引用）。 经过身份验证的远程攻击者可以发送精心构造的请求，导致 CGI 进程或 Web 管理服务崩溃，从而造成拒绝服务（DoS）攻击。

CVSS 4.9 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
PLANET Technology Corp. PLANET GS-4210-16P2S < 3.441b260626 affected
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I. Basic Information for CVE-2026-77217

Vulnerability Information
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Vulnerability Title
PLANET GS-4210-16P2S Stack Buffer Overflow and NULL Pointer Dereference via dispatcher.cgi RADIUS Handlers
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
PLANET Technology Corp. PLANET GS-4210-16P2S 0 ~ 3.441b260626 -

II. Public POCs for CVE-2026-77217

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III. Intelligence Information for CVE-2026-77217

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Vendor Advisories for CVE-2026-77217 (2)

Same Patch Batch · PLANET Technology Corp. · 2026-08-28 · 8 CVEs total

CVE-2026-75124 7.5 HIGH PLANET GS-4210-16P2S Memory Corruption via dispatcher.cgi _readHttpParam
CVE-2026-75121 7.2 HIGH PLANET GS-4210-16P2S Command Injection via dispatcher.cgi web_vlan_membership_edit_dialog_
CVE-2026-75122 7.2 HIGH PLANET GS-4210-16P2S Command Injection via httpuploadcert.cgi
CVE-2026-75123 7.2 HIGH PLANET GS-4210-16P2S Command Injection via dispatcher.cgi web_smtp_test_post
CVE-2026-75126 4.9 MEDIUM PLANET GS-4210-16P2S Stack Buffer Overflow via dispatcher.cgi Standard Handlers
CVE-2026-75125 4.9 MEDIUM PLANET GS-4210-16P2S Null Pointer Dereference DoS via dispatcher.cgi web_poe_alive_rmtip_p
CVE-2026-77218 4.9 MEDIUM PLANET GS-4210-16P2S Stack Buffer Overflow via dispatcher.cgi Credential Handlers

IV. Related Vulnerabilities

Same product: PLANET GS-4210-16P2S
Same vendor: PLANET Technology Corp.
Same weakness: CWE-121

V. Comments for CVE-2026-77217

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