Authenticated code execution via unchecked sprintf
Published Mar 8, 2026 · Updated Mar 8, 2026
Stack-based buffer overflow in Tenda F453 firmware 1.0.0.3 and 1.If allows remote authenticated users to execute code via HTTP. The fromSetCfm handler passes funcpara1 to sub_3A874 when funcname is save_list_data, where sprintf writes it into fixed-size stack buffer s without a length check. Low-privilege access to the web interface is required; a crafted POST to /goform/setcfm can crash httpd or execute code on the router.
Summary
What happened
Stack-based buffer overflow in Tenda F453 firmware 1.0.0.3 and 1.If allows remote authenticated users to execute code via HTTP. The fromSetCfm handler passes funcpara1 to sub_3A874 when funcname is save_list_data, where sprintf writes it into fixed-size stack buffer s without a length check. Low-privilege access to the web interface is required; a crafted POST to /goform/setcfm can crash httpd or execute code on the router.
The record
- CVE
- CVE-2026-3728
- Published
- Mar 8, 2026
- Updated
- Mar 8, 2026
- Vendor
- Shenzhen Tenda Technology Co., Ltd.
- Product
- F453
- Classifications
- CWE-119, CWE-121, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Mar 8, 2026CVE publishedPublication date reported by the CVE source.
- Mar 8, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=1.0.0.3
- Affected versionversion=1.If
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
- F453 fromSetCfm HTTP proof of conceptproof of concept · unverified
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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