Stack-based buffer overflow in ZyXEL Communications Corp. products - CVE-2026-7273
Published: June 17, 2026
Vulnerability identifier: #VU134725
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-7273
CWE-ID: CWE-121
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vendor: ZyXEL Communications Corp.
Affected software:
GS1900-8
GS1900-8HP
GS1900-48HPv2
GS1900-10HP
GS1900-48
GS1900-16
GS1900-24HPv2
GS1900-24
GS1900-24EP
GS1900-24E
GS1900-8
GS1900-8HP
GS1900-48HPv2
GS1900-10HP
GS1900-48
GS1900-16
GS1900-24HPv2
GS1900-24
GS1900-24EP
GS1900-24E
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error in the CGI program. A remote attacker on the local network can trigger stack-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
How to mitigate CVE-2026-7273
Install updates from vendor's website.