Authenticated router crash via unchecked page parameter
Published Dec 11, 2025 · Updated Dec 11, 2025
Buffer overflow in frmL7ImForm in Tenda CH22 firmware 1.0.0.1 allows remote authenticated users to crash the router via an HTTP request. The /goform/L7Im handler passes the attacker-controlled page parameter through v6() to sprintf() into a 256-byte stack buffer without a length check. Low-privilege authentication is required; the published proof of concept sends 1,024 bytes and leaves the emulated router inaccessible.
Summary
What happened
Buffer overflow in frmL7ImForm in Tenda CH22 firmware 1.0.0.1 allows remote authenticated users to crash the router via an HTTP request. The /goform/L7Im handler passes the attacker-controlled page parameter through v6() to sprintf() into a 256-byte stack buffer without a length check. Low-privilege authentication is required; the published proof of concept sends 1,024 bytes and leaves the emulated router inaccessible.
The record
- CVE
- CVE-2025-14526
- Published
- Dec 11, 2025
- Updated
- Dec 11, 2025
- Vendor
- Shenzhen Tenda Technology Co., Ltd.
- Product
- CH22 Firmware
- Classifications
- CWE-120, CWE-119, T1499.004
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Dec 11, 2025CVE publishedPublication date reported by the CVE source.
- Dec 11, 2025Record 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=1.0.0.1
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
- CH22 /goform/L7Im oversized page proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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