High [CVE-2026-7273] 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
This high-severity Zyxel advisory covers CVE-2026-7273 affecting GS1900-48HPv2 firmware, GS1900-8 firmware, GS1900-8HP firmware.
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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 crafted HTTP request.
Affected products named by the advisory: GS1900-8 firmware; GS1900-8HP firmware; GS1900-10HP firmware; GS1900-16 firmware; and 3 more.
Affected products named by the advisory: GS1900-24 firmware; GS1900-24E firmware; GS1900-24EP firmware.
CISA Known Exploited Vulnerability
- Listed:
- Sep 21, 2026 · federal remediation due Sep 24, 2026
- 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 each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
- Ransomware use:
- Unknown
KEV is a prioritization signal from CISA — remediation detail still comes from the vendor advisory.
- through 2.90
Official advisory · high-confidence parse· fetched 18 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 18 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · high-confidence parse· fetched 18 days ago·verify at source
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