CVE-2026-75125: PLANET GS-4210-16P2S V3 Null Pointer Dereference DoS via dispatcher.cgi web_poe_alive_rmtip_post

Severity: medium (CVSS 4.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-28 · updated 2026-09-08
Weakness: CWE-476

Description

PLANET GS-4210-16P2S V3 firmware before 3.441b260626 contains an authenticated null pointer dereference vulnerability in /cgi-bin/dispatcher.cgi. The web_poe_alive_rmtip_post handler dereferences the rmtIP parameter without verifying its presence. A remote authenticated attacker can send a crafted request omitting the rmtIP parameter to cause the CGI process to dereference a null pointer and crash, resulting in denial of service of the web management interface.

Affected products

PLANET Technology Corp. PLANET GS-4210-16P2S V3: before 3.441b260626 — fixed in 3.441b260626

How to fix

Upgrade to a fixed version: PLANET Technology Corp. PLANET GS-4210-16P2S V3 3.441b260626. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2026-75125 or the next vulnerability affects your stack