CVE-2024-39770
Published: 14 January 2025
Summary
CVE-2024-39770 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-2024-39770 consists of multiple stack-based buffer overflow vulnerabilities (CWE-120) in the set_qos() functionality of the internet.cgi script on the Wavlink AC3000 router running firmware version M33A8.V5030.210505. These issues arise from improper handling of the `en_enable` POST parameter in specially crafted HTTP requests, potentially leading to buffer overflows.
An authenticated attacker with high privileges (PR:H) can exploit these vulnerabilities remotely over the network (AV:N) with low complexity (AC:L) and without user interaction (UI:N). By sending a malicious HTTP request, the attacker can trigger the stack-based buffer overflow, achieving high impacts on confidentiality, integrity, and availability (C:H/I:H/A:H) across the affected scope (S:C), as reflected in the CVSS v3.1 base score of 9.1.
Mitigation guidance is available in the Talos Intelligence advisory at https://talosintelligence.com/vulnerability_reports/TALOS-2024-2022.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2024-38341
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 `en_enable` POST parameter.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Buffer overflow in router web CGI script (internet.cgi) directly enables remote exploitation of a public-facing network device application by an authenticated high-privilege attacker.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Information Input Validation directly prevents stack-based buffer overflows by enforcing validity checks on the en_enable POST parameter in the set_qos() function.
Memory Protection implements safeguards like stack canaries, ASLR, and DEP to mitigate exploitation of stack-based buffer overflows in internet.cgi.
Flaw Remediation requires identifying, patching, and testing fixes for the specific buffer overflow vulnerabilities in the Wavlink router firmware.