Code execution via unchecked password handling
Published Mar 7, 2026 · Updated Mar 7, 2026
Stack-based buffer overflow in Tenda FH451 1.0.0.9 allows remote authenticated users to crash httpd or execute code via a QuickIndex request. The formQuickIndex handler passes an attacker-controlled PPPOEPassword value to sub_3C434 without checking its length, overflowing stack buffer s. Exploitation requires access to the router's web management interface; successful corruption can interrupt routing services or enable code execution.
Summary
What happened
Stack-based buffer overflow in Tenda FH451 1.0.0.9 allows remote authenticated users to crash httpd or execute code via a QuickIndex request. The formQuickIndex handler passes an attacker-controlled PPPOEPassword value to sub_3C434 without checking its length, overflowing stack buffer s. Exploitation requires access to the router's web management interface; successful corruption can interrupt routing services or enable code execution.
The record
- CVE
- CVE-2026-3679
- Published
- Mar 7, 2026
- Updated
- Mar 7, 2026
- Vendor
- Shenzhen Tenda Technology Co., Ltd.
- Product
- FH451
- Classifications
- CWE-119, CWE-121, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Mar 7, 2026CVE publishedPublication date reported by the CVE source.
- Mar 7, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=1.0.0.9
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
- FH451 formQuickIndex crafted-request proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo