Authenticated code execution via unchecked cli_name concatenation
Published Jan 14, 2025 · Updated Nov 3, 2025
Stack-based buffer overflow in Wavlink AC3000 Tri-band Wi-Fi Router M33A8.V5030.210505 allows remote authenticated users to execute code via HTTP. The set_qos() path in internet.cgi passes the unrestricted cli_name POST value to strcat(), appending it to a 0x400-byte stack buffer without a bounds check. A valid session cookie and network access to the administrative HTTP interface are required; successful overwrite controls the return address and executes attacker-supplied code.
Summary
What happened
Stack-based buffer overflow in Wavlink AC3000 Tri-band Wi-Fi Router M33A8.V5030.210505 allows remote authenticated users to execute code via HTTP. The set_qos() path in internet.cgi passes the unrestricted cli_name POST value to strcat(), appending it to a 0x400-byte stack buffer without a bounds check. A valid session cookie and network access to the administrative HTTP interface are required; successful overwrite controls the return address and executes attacker-supplied code.
The record
- CVE
- CVE-2024-39768
- Published
- Jan 14, 2025
- Updated
- Nov 3, 2025
- Vendor
- Wavlink
- Product
- AC3000 Tri-band Wi-Fi Router
- Classifications
- CWE-120, T1190
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Jan 14, 2025CVE publishedPublication date reported by the CVE source.
- Nov 3, 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=M33A8.V5030.210505
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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
- Talos cli_name buffer-overflow proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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