CVE-2024-39768
Published: 14 January 2025
Summary
CVE-2024-39768 is a critical-severity Classic Buffer Overflow (CWE-120) 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 24.5% 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-16 (Memory Protection).
Deeper analysis
CVE-2024-39768 consists of multiple stack-based buffer overflow vulnerabilities in the set_qos() functionality of the internet.cgi script on the Wavlink AC3000 router running firmware version M33A8.V5030.210505. These issues, classified under CWE-120, are triggered by a specially crafted HTTP request targeting the `cli_name` POST parameter.
An attacker with high privileges can exploit these vulnerabilities by sending an authenticated HTTP request to the affected endpoint. The CVSS v3.1 base score of 9.1 (AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H) indicates network accessibility with low attack complexity, no user interaction required, and a scope change that enables high impacts on confidentiality, integrity, and availability, potentially leading to arbitrary code execution.
Mitigation guidance is available in the Talos Intelligence advisory at https://talosintelligence.com/vulnerability_reports/TALOS-2024-2022.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2024-38394
Vulnerability details
Multiple buffer overflow vulnerabilities exist in the internet.cgi set_qos() functionality of Wavlink AC3000 M33A8.V5030.210505. A specially crafted HTTP request can lead to stack-based buffer overflow. An attacker can make an authenticated HTTP request to trigger these vulnerabilities.This vulnerability exists in…
more
the `cli_name` POST parameter.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Authenticated stack buffer overflow in router web CGI script (internet.cgi) directly enables remote code execution against a public-facing network device web interface.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Requires validation and bounds checking of the cli_name POST parameter to directly prevent stack-based buffer overflows in the set_qos() function.
Implements memory protections such as stack canaries, ASLR, and non-executable memory to mitigate exploitation of stack buffer overflows even if input validation fails.
Mandates timely remediation of known flaws like CVE-2024-39768 through firmware updates to eliminate the buffer overflow vulnerability.