Authenticated device crash via oversized language setting
Published Oct 27, 2025 · Updated Oct 27, 2025
Stack-based buffer overflow in TOTOLINK A3300R 17.0.0cu.557_B20221024 allows remote authenticated users to crash the router. The setLanguageCfg handler writes an oversized lang POST value to the lang_type configuration key without a length check, and getInitCfg later copies the stored value into a stack buffer without bounds checking. Exploitation requires a valid session cookie and two CGI requests; the public proof of concept demonstrates a device crash, not code execution.
Summary
What happened
Stack-based buffer overflow in TOTOLINK A3300R 17.0.0cu.557_B20221024 allows remote authenticated users to crash the router. The setLanguageCfg handler writes an oversized lang POST value to the lang_type configuration key without a length check, and getInitCfg later copies the stored value into a stack buffer without bounds checking. Exploitation requires a valid session cookie and two CGI requests; the public proof of concept demonstrates a device crash, not code execution.
The record
- CVE
- CVE-2025-12241
- Published
- Oct 27, 2025
- Updated
- Oct 27, 2025
- Vendor
- TOTOLINK
- Product
- A3300R
- Classifications
- CWE-121, CWE-119
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 27, 2025CVE publishedPublication date reported by the CVE source.
- Oct 27, 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?
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- Affected versionversion=17.0.0cu.557_B20221024
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
- A3300R setLanguageCfg stack-overflow proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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