CVE-2024-39801
Published: 14 January 2025
Summary
CVE-2024-39801 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 28.9% 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
Multiple buffer overflow vulnerabilities, including CWE-120, affect the qos.cgi qos_settings() functionality in the Wavlink AC3000 router running firmware version M33A8.V5030.210505. These issues arise from improper handling of the `qos_bandwidth` POST parameter, where a specially crafted HTTP request can trigger a stack-based buffer overflow.
An authenticated attacker with high privileges (PR:H) can exploit these vulnerabilities over the network (AV:N) with low complexity (AC:L). Successful exploitation leads to high-impact consequences across confidentiality, integrity, availability, and scope change (CVSS:3.1 score of 9.1), potentially enabling arbitrary code execution or system compromise via the stack-based overflow.
Talos Intelligence documented these flaws in vulnerability reports TALOS-2024-2049, available at https://talosintelligence.com/vulnerability_reports/TALOS-2024-2049 and https://www.talosintelligence.com/vulnerability_reports/TALOS-2024-2049. Practitioners should consult these advisories for detailed technical analysis and recommended mitigations, such as firmware updates if available or restricting access to the affected qos.cgi endpoint.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2024-38345
Vulnerability details
Multiple buffer overflow vulnerabilities exist in the qos.cgi qos_settings() 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.A buffer overflow vulnerability…
more
exists in the `qos_bandwidth` POST parameter.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Buffer overflow in router web CGI (qos.cgi) directly enables remote exploitation of a public-facing application for arbitrary code execution.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Validates inputs like the qos_bandwidth POST parameter to prevent stack-based buffer overflows from specially crafted HTTP requests.
Implements memory protections such as stack canaries and DEP to mitigate exploitation of stack-based buffer overflows even if input validation fails.
Requires timely remediation through firmware updates to address the specific buffer overflow in qos.cgi qos_settings() functionality.