CVE-2026-7273: zyxel gs1900-8_firmware, zyxel gs1900-8hp_firmware, zyxel gs1900-10hp_firmware

CVSS 8.8 (high) · listed as exploited by CISA since 2026-09-21 · published 2026-06-16

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 (NVD): zyxel gs1900-8_firmware, zyxel gs1900-8hp_firmware, zyxel gs1900-10hp_firmware, zyxel gs1900-16_firmware, zyxel gs1900-24_firmware, zyxel gs1900-24e_firmware, zyxel gs1900-24ep_firmware, zyxel gs1900-24hpv2_firmware, zyxel gs1900-48_firmware, zyxel gs1900-48hpv2_firmware

Fixed in (NVD): 2.90\(aahh.2\)c0, 2.90\(aahi.2\)c0, 2.90\(aazi.2\)c0, 2.90\(aahj.2\)c0, 2.90\(aahl.2\)c0, 2.90\(aahk.2\)c0, 2.90\(abto.2\)c0, 2.90\(abtp.2\)c0, 2.90\(aahn.2\)c0, 2.90\(abtq.2\)c0

Weakness: CWE-121

Source: NVD CVE-2026-7273

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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