Cyber Resilience

CVE-2026-7273

High

Published: 16 June 2026

Published
16 June 2026
Modified
18 June 2026
KEV Added
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Patch
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CVSS Score v3.1 8.8 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0032 23.3th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-7273 is a high-severity Stack-based Buffer Overflow (CWE-121) vulnerability in Zyxel GS1900-48HPv2 (inferred from references). Its CVSS base score is 8.8 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 23.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

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.

CWE(s)
CWE-121

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
Why these techniques?

Stack buffer overflow in unauthenticated CGI/web interface directly enables remote OS command execution over HTTP.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

Affected Assets

Zyxel
GS1900-48HPv2
inferred from references and description; NVD did not file a CPE for this CVE

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References