CVE-2026-7273: CWE-121 Stack-based buffer overflow in Zyxel GS1900-48HPv2 firmware
A stack-based buffer overflow vulnerability exists in the CGI program of Zyxel GS1900-48HPv2 firmware versions up to 2.90(ABTQ.1)C0. This flaw could allow an unauthenticated attacker on the LAN to execute arbitrary OS commands via a crafted HTTP request. The vulnerability has a high severity with a CVSS score of 8.8. No official patch or remediation guidance has been provided yet by Zyxel. There are no known exploits in the wild at this time.
AI Analysis
Technical Summary
CVE-2026-7273 is a stack-based buffer overflow vulnerability (CWE-121) in the CGI program of Zyxel GS1900-48HPv2 firmware versions through 2.90(ABTQ.1)C0. An unauthenticated attacker with LAN access can exploit this vulnerability by sending a specially crafted HTTP request, potentially leading to arbitrary OS command execution. The vulnerability is rated high severity with a CVSS 3.1 base score of 8.8 (Attack Vector: Adjacent Network, Attack Complexity: Low, Privileges Required: None, User Interaction: None, Scope: Unchanged, Confidentiality/Integrity/Availability: High). No vendor advisory or patch information is currently available.
Potential Impact
Successful exploitation allows an unauthenticated attacker on the LAN to execute arbitrary operating system commands on the affected device. This can lead to full compromise of the device, including confidentiality, integrity, and availability impacts.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict LAN access to trusted users and networks to reduce exposure. Monitor Zyxel's official channels for updates and apply patches promptly once available.
CVE-2026-7273: CWE-121 Stack-based buffer overflow in Zyxel GS1900-48HPv2 firmware
Description
A stack-based buffer overflow vulnerability exists in the CGI program of Zyxel GS1900-48HPv2 firmware versions up to 2.90(ABTQ.1)C0. This flaw could allow an unauthenticated attacker on the LAN to execute arbitrary OS commands via a crafted HTTP request. The vulnerability has a high severity with a CVSS score of 8.8. No official patch or remediation guidance has been provided yet by Zyxel. There are no known exploits in the wild at this time.
CVSS v3.1
Score 8.8high
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-7273 is a stack-based buffer overflow vulnerability (CWE-121) in the CGI program of Zyxel GS1900-48HPv2 firmware versions through 2.90(ABTQ.1)C0. An unauthenticated attacker with LAN access can exploit this vulnerability by sending a specially crafted HTTP request, potentially leading to arbitrary OS command execution. The vulnerability is rated high severity with a CVSS 3.1 base score of 8.8 (Attack Vector: Adjacent Network, Attack Complexity: Low, Privileges Required: None, User Interaction: None, Scope: Unchanged, Confidentiality/Integrity/Availability: High). No vendor advisory or patch information is currently available.
Potential Impact
Successful exploitation allows an unauthenticated attacker on the LAN to execute arbitrary operating system commands on the affected device. This can lead to full compromise of the device, including confidentiality, integrity, and availability impacts.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict LAN access to trusted users and networks to reduce exposure. Monitor Zyxel's official channels for updates and apply patches promptly once available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Zyxel
- Date Reserved
- 2026-04-28T06:21:36.574Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a30bc400b89be688819055f
Added to database: 6/16/2026, 3:00:16 AM
Last enriched: 6/16/2026, 3:15:11 AM
Last updated: 6/16/2026, 4:08:12 AM
Views: 4
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