Weakness
A stack-based buffer overflow vulnerability in the CGI program of Zyxel GS1900-48HPv2 firmware versions through 2.90(ABTQ.1)C0 could allow a LAN-based, unauthenticated attacker to exploit the flaw and potentially execute OS commands via a crafted HTTP request.
Affected products
- zyxel gs1900-8_firmware
- zyxel gs1900-8
- zyxel gs1900-8hp_firmware
- zyxel gs1900-8hp
- zyxel gs1900-10hp_firmware
- zyxel gs1900-10hp
- zyxel gs1900-16_firmware
- zyxel gs1900-16
References
- https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-stack-based-buffer-overflow-vulnerability-in-gs1900-series-switches-06-16-2026
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-7273
- https://www.greynoise.io/blog/open-season-on-kapibala-attacker-steals-government-records-wordpress-exploitation
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