- High 8.8
- Known exploited (CISA KEV)
CVE-2026-7273
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.
Scores
The facts
- Published
- 16 June 2026
- Last changed
- 22 September 2026
- NVD status
- Analyzed
- Severity
- High, CVSS 8.8 out of 10 (version 3.1)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- Affects
- zyxel gs1900-8 firmware
- zyxel gs1900-8hp firmware
- zyxel gs1900-10hp firmware
- zyxel gs1900-16 firmware
- zyxel gs1900-24 firmware
- Known exploited
- Yes. CISA added it to the Known Exploited Vulnerabilities catalogue on 21 September 2026.
- EPSS
- 2.5% chance of exploitation activity in the next 30 days (percentile 84).
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