Cyber Resilience

CVE-2024-39784

CriticalPublic PoC

Published: 14 January 2025

Published
14 January 2025
Modified
03 November 2025
KEV Added
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Patch
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CVSS Score v3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
EPSS Score 0.0058 69.4th percentile
Risk Priority 19 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2024-39784 is a critical-severity Injection (CWE-74) 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 30.6% 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-2 (Flaw Remediation).

Deeper analysis

CVE-2024-39784 consists of multiple command execution vulnerabilities in the nas.cgi add_dir() functionality of the Wavlink AC3000 router running firmware version M33A8.V5030.210505. A specially crafted HTTP request can lead to arbitrary command execution. Additionally, a command injection vulnerability exists in the disk_part POST parameter. The issue is associated with CWE-74 and carries 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).

These vulnerabilities can be exploited by an authenticated attacker with high privileges who sends a malicious HTTP request to the affected nas.cgi endpoint. Successful exploitation enables arbitrary command execution on the device, potentially granting full control over the router's operating system.

Mitigation guidance is available in the Talos Intelligence advisory at https://talosintelligence.com/vulnerability_reports/TALOS-2024-2058.

EU & UK References

Vulnerability details

Multiple command execution vulnerabilities exist in the nas.cgi add_dir() functionality of Wavlink AC3000 M33A8.V5030.210505. A specially crafted HTTP request can lead to arbitrary command execution. An attacker can make an authenticated HTTP request to trigger these vulnerabilities.A command injection vulnerability…

more

exists in the disk_part POST parameter.

CWE(s)
CWE-74

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1059.004 Unix Shell Execution
Adversaries may abuse Unix shell commands and scripts for execution.
attack.mitre.org →
Why these techniques?

Command injection in public-facing nas.cgi web endpoint enables T1190 exploitation; resulting arbitrary OS command execution on Linux-based router firmware maps to T1059.004.

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

CVEs Like This One

CVE-2024-39785Same product: Wavlink Wl-Wn533A8
CVE-2024-34544Same product: Wavlink Wl-Wn533A8
CVE-2024-36295Same product: Wavlink Wl-Wn533A8
CVE-2024-39604Same product: Wavlink Wl-Wn533A8
CVE-2024-21797Same product: Wavlink Wl-Wn533A8
CVE-2024-39783Same product: Wavlink Wl-Wn533A8
CVE-2024-39781Same product: Wavlink Wl-Wn533A8
CVE-2024-39367Same product: Wavlink Wl-Wn533A8
CVE-2024-38666Same product: Wavlink Wl-Wn533A8
CVE-2024-39280Same product: Wavlink Wl-Wn533A8

Affected Assets

wavlink
wl-wn533a8 firmware
m33a8.v5030.210505

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match
prevent

Directly validates and sanitizes HTTP POST parameters like disk_part and inputs to nas.cgi add_dir() to prevent command injection and arbitrary execution.

SI-2 Flaw Remediation good match
prevent

Remediates the specific command execution flaws in Wavlink AC3000 firmware version M33A8.V5030.210505 by identifying, patching, and verifying fixes.

CM-6 Configuration Settings partial match
prevent

Enforces secure configuration settings for the router's web interface and CGI scripts to minimize exposure of vulnerable nas.cgi functionality.

References