CVE-2024-39769
Published: 14 January 2025
Summary
CVE-2024-39769 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 28.3% 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-2024-39769 consists of multiple stack-based buffer overflow vulnerabilities in the internet.cgi set_qos() functionality of the Wavlink AC3000 firmware version M33A8.V5030.210505. These issues, classified under CWE-120, are triggered by a specially crafted HTTP request targeting the `cli_mac` POST parameter. The vulnerability received 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) upon publication on 2025-01-14.
An authenticated attacker with high privileges (PR:H) can exploit these vulnerabilities remotely over the network (AV:N) with low attack complexity and no user interaction. By sending a malicious HTTP POST request, the attacker triggers the buffer overflow, potentially achieving high impacts on confidentiality, integrity, and availability across the affected scope (S:C), such as arbitrary code execution or system crashes.
Mitigation guidance and additional technical details are available in the Talos Intelligence advisory at https://talosintelligence.com/vulnerability_reports/TALOS-2024-2022.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2024-38395
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_mac` POST parameter.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Buffer overflow RCE in public-facing router web CGI (internet.cgi) directly matches exploitation of public-facing applications for initial access and code execution.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly prevents stack-based buffer overflows by validating the length and format of the `cli_mac` POST parameter in the internet.cgi set_qos() function.
Implements runtime memory protections such as stack canaries, ASLR, and non-executable memory to block exploitation of the stack-based buffer overflow for arbitrary code execution.
Requires identification, reporting, and correction of the buffer overflow flaw in the Wavlink firmware, enabling patching to eliminate the vulnerability.