Summary
generated automatically from NVD dataA stack-based buffer overflow (CWE-121) in the CGI program of Zyxel GS1900 series switch firmware, including the GS1900-48HPv2 with versions through 2.90(ABTQ.1)C0, can be triggered by a crafted HTTP request. An unauthenticated attacker on the same LAN could use it to potentially execute OS commands on the device. The flaw is rated 8.8 (HIGH, CVSS v3.1) and is listed in the CISA KEV catalog, which indicates active exploitation.
NVD description
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.
⚠️ Actively exploited — CISA KEV
This CVE was added to CISA's Known Exploited Vulnerabilities catalog on 2026-09-21. It is confirmed exploited in the wild and must be patched as a priority.
Remediation deadline (US federal agencies): 2026-09-24
EPSS · FIRST.org
2.5%probability of exploitation in the next 30 days
Higher than 84% of scored CVEs
EPSS (Exploit Prediction Scoring System) estimates, from observed exploitation activity, how likely a CVE is to be exploited in the next 30 days. It complements CVSS, which measures severity, not likelihood. Score of 2026-10-19, recomputed daily by FIRST.org.
CVSS v3.1 Score
Information
- Published
- 16 juin 2026
- Updated
- 22 sept. 2026
- Status
- Analyzed
- Source
- security@zyxel.com.tw
Affected products
Weaknesses (CWE)
References (3)
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-7273Third Party AdvisoryUS Government Resource
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