CVE-2024-39786
Published: 14 January 2025
Summary
CVE-2024-39786 is a critical-severity Path Traversal (CWE-22) vulnerability in Wavlink Wl-Wn533A8 Firmware. Its CVSS base score is 9.1 (Critical).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 48.6% 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
Multiple directory traversal vulnerabilities exist in the nas.cgi add_dir() functionality of the Wavlink AC3000 router running firmware version M33A8.V5030.210505. These flaws, including one specifically within the `adddir_name` POST parameter, allow a specially crafted HTTP request to bypass permissions. The vulnerabilities are classified under CWE-22 and carry a CVSS v3.1 base score of 9.1 (AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H), indicating critical severity due to network accessibility, low attack complexity, and high impacts across confidentiality, integrity, and availability with changed scope.
An authenticated attacker with high privileges (PR:H) can exploit these vulnerabilities by sending a malicious HTTP request to the affected nas.cgi endpoint. This triggers directory traversal, enabling permission bypass that grants unauthorized access to sensitive directories and files. Successful exploitation could allow the attacker to read, modify, or delete critical data, potentially leading to full compromise of the device given the high-impact CVSS metrics.
Mitigation details are outlined in the Cisco Talos Intelligence advisory at https://talosintelligence.com/vulnerability_reports/TALOS-2024-2057, which provides technical analysis and recommendations for addressing TALOS-2024-2057.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2024-38378
Vulnerability details
Multiple directory traversal vulnerabilities exist in the nas.cgi add_dir() functionality of Wavlink AC3000 M33A8.V5030.210505. A specially crafted HTTP request can lead to permission bypass. An attacker can make an authenticated HTTP request to trigger these vulnerabilities.A directory traversal vulnerability exists…
more
within the `adddir_name` POST parameter.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Directory traversal in public-facing nas.cgi web endpoint directly enables remote exploitation of the router's application interface for unauthorized file access.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly prevents directory traversal vulnerabilities by validating inputs like the adddir_name POST parameter against traversal sequences such as '../' in nas.cgi.
Remediates the specific flaw in the nas.cgi add_dir() function through timely firmware patching to eliminate the permission bypass.
Enforces access control policies to restrict unauthorized file and directory access even if partial path traversal occurs.