CVE-2026-7273
high CISA KEVZyxel GS1900 Series Switches Stack-Based Buffer Overflow Vulnerability
Vendor / product: Zyxel — GS1900 Series Switches
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.
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Required action (CISA)
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Affected products
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
References
- https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-st... security@zyxel.com.tw
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-7273 134c704f-9b21-4f2e-91b3-4a467353bcc0
- https://www.greynoise.io/blog/open-season-on-kapibala-attacker-steals-government-records-w... 134c704f-9b21-4f2e-91b3-4a467353bcc0