CVE-2024-39756
Memory Safety in Wavlink Wl-Wn533A8 Firmware m33a8.v5030.210505
Raw vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:HCVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.
Summary
CVE-2024-39756 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 NTDS (T1003.003); ranked in the top 21% 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 map to SA-11 (Developer Testing and Evaluation) and SI-10 (Information Input Validation) — see the control section below for these in your framework.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
A buffer overflow vulnerability, tracked as CVE-2024-39756 and published on 2025-01-14, affects the adm.cgi rep_as_router() functionality in Wavlink AC3000 routers running firmware version M33A8.V5030.210505. The issue stems from CWE-120 (Buffer Copy without Checking Size of Input), where a specially crafted HTTP request triggers a stack-based buffer overflow. This flaw has 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 its potential for high confidentiality, integrity, and availability impacts with changed scope.
Exploitation requires an authenticated attacker with high privileges (PR:H) to send a malicious HTTP request to the vulnerable component over the network (AV:N) with low complexity (AC:L) and no user interaction (UI:N). Successful exploitation can lead to arbitrary code execution, enabling full compromise of the affected router, including potential data theft, modification of configurations, or denial of service.
Mitigation details are available in the Talos Intelligence advisory at https://talosintelligence.com/vulnerability_reports/TALOS-2024-2024. Security practitioners should consult this report for patch information, workarounds, or firmware updates specific to the Wavlink AC3000 device.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2024-38393
Vulnerability Data
A buffer overflow vulnerability exists in the adm.cgi rep_as_router() 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 this vulnerability.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Control response
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V5.2.1
Mitigating Controls (NIST 800-53 r5) AI
Developer testing and analysis can find missing size checks before deployment.
Input validation directly enforces size checks before buffer copies.
Engineering principles require bounds checking and safe buffer handling in design.
Memory protection limits the impact of an overflow once it occurs.
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
Vulnerability identification processes such as code review or scanning detect classic buffer overflows before exploitation.
Routine patching replaces vulnerable code containing unchecked buffer copies with corrected versions.
Secure development practices directly enforce bounds checking and input validation that prevent classic buffer overflows.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.