Zyxel GS1900 Series Switches Stack-Based Buffer Overflow Vulnerability
Zyxel GS1900 series switches contain a stack-based buffer overflow vulnerability in the CGI program which could allow a LAN-based, unauthenticated attacker to exploit the flaw and potentially execute OS commands via a crafted HTTP request.
CISA required action: 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
Read at CISA Known Exploited Vulnerabilities catalog
- Vendor
- Zyxel
- Product
- GS1900 Series Switches
- CISA KEV
- added 21 Sep 2026, due 24 Sep 2026 (38d overdue)
- Exploitation
- observed in the wild
- Fix
- available
- Weakness
- CWE-121
Why it ranks 57 (Critical)
- CISA KEV listed, remediation due 2026-09-24
- Covered by 4 independent sources
- Fix available
- Recency: items published within 24 hours gain 15, within 72 hours 6, within 7 days 2.
Links
- CISA Known Exploited Vulnerabilities catalog (nvd.nist.gov)
- Vendor advisory (zyxel.com)
- CVE-2026-7273 on this site · NVD · CVE.org · Vulnpedia · KEV
Related coverage
Other items that share a CVE or were clustered with this one.