Authenticated stack overflow via oversized syslog 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 corrupt memory via syslog configuration. The setSyslogCfg handler stores an oversized enable value as the syslog switch without a length check, and getSyslogCfg later copies it into a stack buffer. A valid management session is required; the published proof of concept uses a session cookie and triggers the overflow by retrieving the stored setting.
Summary
What happened
Stack-based buffer overflow in TOTOLINK A3300R 17.0.0cu.557_B20221024 allows remote authenticated users to corrupt memory via syslog configuration. The setSyslogCfg handler stores an oversized enable value as the syslog switch without a length check, and getSyslogCfg later copies it into a stack buffer. A valid management session is required; the published proof of concept uses a session cookie and triggers the overflow by retrieving the stored setting.
The record
- CVE
- CVE-2025-12260
- 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?
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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
- setSyslogCfg authenticated overflow proof of conceptproof of concept · unverified
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Technologies
Your stack
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Your stack
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