Authenticated code execution via unbounded sprintf
Published Mar 22, 2026 · Updated Mar 22, 2026
Stack-based buffer overflow in Tenda FH451 1.0.0.9 allows remote authenticated users to execute code through a crafted GO parameter. formWrlExtraSet passes the GO-derived value to sub_3A54C without a length check, where sprintf overflows stack buffer s_. Low-privileged access to the router management interface is required; successful exploitation can crash the HTTP service or run code on the router.
Summary
What happened
Stack-based buffer overflow in Tenda FH451 1.0.0.9 allows remote authenticated users to execute code through a crafted GO parameter. formWrlExtraSet passes the GO-derived value to sub_3A54C without a length check, where sprintf overflows stack buffer s_. Low-privileged access to the router management interface is required; successful exploitation can crash the HTTP service or run code on the router.
The record
- CVE
- CVE-2026-4534
- Published
- Mar 22, 2026
- Updated
- Mar 22, 2026
- Vendor
- Shenzhen Tenda Technology Co., Ltd.
- Product
- FH451 Firmware
- Classifications
- CWE-121, CWE-119, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Mar 22, 2026CVE publishedPublication date reported by the CVE source.
- Mar 22, 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=1.0.0.9
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 WrlExtraSet GO overflow proof of conceptproof of concept · unverified
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Technologies
Your stack
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Your stack
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