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CVE-2026-7273

8.8 high KEV · due 2026-09-24 SSVC exploitation: active Analyzed
NVD · CVE.org · CISA KEV

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.

Fix

CISA KEV required action · due 2026-09-24

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.

Added to the catalog 2026-09-21. CISA KEV

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 8.8 · in KEV · zyxelNVD modified 2026-10-25 23:10

Affected (CPE criteria) 10

  • cpe:2.3:o:zyxel:gs1900-8_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:gs1900-8hp_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:gs1900-10hp_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:gs1900-16_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:gs1900-24_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:gs1900-24e_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:gs1900-24ep_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:gs1900-24hpv2_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:gs1900-48_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:gs1900-48hpv2_firmware:*:*:*:*:*:*:*:*

References 3