CVE-2026-7273
Zyxel GS1900-48HPv2 firmware
Summary
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…
Published: 2026-06-16 · In KEV since: 2026-09-21
Analysis
🔴 Critical — actively exploited
Weakness: Buffer Overflow (CWE-121). Writes past the buffer; memory corruption or RCE.
How it's exploited: Exploitable from the local network (adjacent), unauthenticated, no user interaction, and with low complexity.
Impact: Full compromise (confidentiality, integrity and availability).
Status: Active exploitation confirmed by CISA (KEV).
- Patch now: it is in CISA's actively-exploited catalog (KEV), with a deadline.
- Detect: turn this CVE into detection rules.
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
The vector encodes how it's exploited (translated above, in the analysis). Break it down in the CVSS tool →
Sources: CISA KEV · EPSS · FIRST.org · NVD. Analysis derived from the CVSS vector and exploitation status (no AI). Informational; always verify against the vendor's official advisory.