Zyxel GS1900 CGI Stack Overflow RCE (CVE-2026-7273)

Exploits CVE-2026-7273 pre-authentication stack-based buffer overflow in Zyxel GS1900 smart-managed switch CGI handlers. Sends an oversized HTTP POST to /cgi-bin/dispatcher.cgi and alternate CGI endpoints to trigger memory corruption and attempt command execution. Firmware = 2.90XXXX.1C0 is...

CVE-2026-75126: Stack-based Buffer Overflow

PLANET GS-4210-16P2S V3 firmware before 3.441b260626 contains multiple authenticated stack buffer overflow vulnerabilities in /cgi-bin/dispatcher.cgi. The following handlers copy attacker-controlled POST parameters into fixed-size stack buffers without length validation:...

CVE-2026-75121: Improper Neutralization of Special Elements used in an OS Command

PLANET GS-4210-16P2S V3 firmware before 3.441b260626 contains an authenticated OS command injection vulnerability in /cgi-bin/dispatcher.cgi. The webvlanmembershipeditdialogpost handler incorporates the memberTags POST parameter into a shell command without sanitization. A remote authenticated...

CVE-2026-77217: Stack-based Buffer Overflow

PLANET GS-4210-16P2S V3 firmware before 3.441b260626 contains authenticated stack buffer overflow and null pointer dereference vulnerabilities in /cgi-bin/dispatcher.cgi. The webradiusSrvpost family of handlers copies the radKey, radKey0, radDftParamKey, radName, and radIp POST parameters into...

CVE-2026-75123: Improper Neutralization of Special Elements used in an OS Command

PLANET GS-4210-16P2S V3 firmware before 3.441b260626 contains an authenticated OS command injection vulnerability in /cgi-bin/dispatcher.cgi. The websmtptestpost handler incorporates a caller-supplied SMTP server value directly into a shell command without sanitization. A remote attacker with...