Authenticated memory corruption via unbounded recHour retrieval
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 corrupt process memory. The setScheduleCfg handler stores an unbounded recHour POST value with Uci_Set_Str, and getScheduleCfg later copies that stored value into stack storage through Uci_Get_Str. An authenticated management session is required; the published proof of concept demonstrates the overflow trigger, but not code execution.
Summary
What happened
Stack-based buffer overflow in TOTOLINK A3300R 17.0.0cu.557_B20221024 allows remote authenticated users to corrupt process memory. The setScheduleCfg handler stores an unbounded recHour POST value with Uci_Set_Str, and getScheduleCfg later copies that stored value into stack storage through Uci_Get_Str. An authenticated management session is required; the published proof of concept demonstrates the overflow trigger, but not code execution.
The record
- CVE
- CVE-2025-12259
- Published
- Oct 27, 2025
- Updated
- Oct 27, 2025
- Vendor
- TOTOLINK
- Product
- A3300R
- Classifications
- CWE-119, CWE-121, T1190
- 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?
Compare these published version ranges with your installed build and any vendor patches.
- 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
- setScheduleCfg recHour overflow proof of conceptproof of concept · unverified
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Technologies
Your stack
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Your stack
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