Authenticated memory corruption via unchecked port mirror input
Published Aug 14, 2026 · Updated Aug 14, 2026
Stack-based buffer overflow in Tenda G0 firmware 20260625 allows remote authenticated users to corrupt httpd memory via port-mirroring input. formSetPortMirror passes portMirrorMirroredPorts to sprintf without a length check, writing the result into a 256-byte stack buffer. Low-privileged web-management access is required; the record establishes confidentiality, integrity, and availability impact but not code execution.
Summary
What happened
Stack-based buffer overflow in Tenda G0 firmware 20260625 allows remote authenticated users to corrupt httpd memory via port-mirroring input. formSetPortMirror passes portMirrorMirroredPorts to sprintf without a length check, writing the result into a 256-byte stack buffer. Low-privileged web-management access is required; the record establishes confidentiality, integrity, and availability impact but not code execution.
The record
- CVE
- CVE-2026-19790
- Published
- Aug 14, 2026
- Updated
- Aug 14, 2026
- Vendor
- Shenzhen Tenda Technology Co., Ltd.
- Product
- G0
- Classifications
- CWE-121, CWE-119, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 14, 2026CVE publishedPublication date reported by the CVE source.
- Aug 14, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=20260625
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Tenda G0 portMirrorMirroredPorts overflow proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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