CVE-2024-39761
Published: 14 January 2025
Summary
CVE-2024-39761 is a critical-severity Command Injection (CWE-77) vulnerability in Wavlink Wl-Wn533A8 Firmware. Its CVSS base score is 10.0 (Critical).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 17.5% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2024-39761 is a set of multiple OS command injection vulnerabilities (CWE-77) in the login.cgi set_sys_init() functionality of the Wavlink AC3000 router running firmware version M33A8.V5030.210505. These flaws allow a specially crafted HTTP request to trigger arbitrary code execution, with a specific instance involving command injection via the `restart_week_value` POST parameter. The vulnerability carries a maximum CVSS v3.1 base score of 10.0 (AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H), indicating critical severity due to its network accessibility, low complexity, and lack of prerequisites.
An unauthenticated attacker can exploit these vulnerabilities remotely by sending a malicious HTTP request to the affected device, leading to arbitrary code execution with elevated privileges. This grants full control over the router, potentially enabling data theft, further network compromise, or persistent access, as reflected in the high impact metrics for confidentiality, integrity, and availability alongside a changed scope.
Mitigation details and additional technical analysis are available in the Cisco Talos Intelligence advisory at https://talosintelligence.com/vulnerability_reports/TALOS-2024-2018.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2024-38355
Vulnerability details
Multiple OS command injection vulnerabilities exist in the login.cgi set_sys_init() functionality of Wavlink AC3000 M33A8.V5030.210505. A specially crafted HTTP request can lead to arbitrary code execution. An attacker can make an unauthenticated HTTP request to trigger these vulnerabilities.A command injection…
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vulnerability exists within the `restart_week_value` POST parameter.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Remote unauthenticated OS command injection in public-facing router web interface (login.cgi) directly enables T1190 for initial access and T1059.004 for Unix shell command execution.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly mitigates OS command injection by validating untrusted HTTP POST parameters like restart_week_value before processing in login.cgi set_sys_init().
Remediates the specific command injection flaws in login.cgi by identifying, testing, and applying firmware patches or updates from the vendor.
Restricts information inputs to the vulnerable login.cgi endpoint to only expected formats, reducing the attack surface for specially crafted HTTP requests.