CVE-2024-39363
Published: 14 January 2025
Summary
CVE-2024-39363 is a critical-severity Basic XSS (CWE-80) vulnerability in Wavlink Wl-Wn533A8 Firmware. Its CVSS base score is 9.6 (Critical).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 6.5% 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-15 (Information Output Filtering).
Deeper analysis
A cross-site scripting vulnerability tracked as CVE-2024-39363 affects the login.cgi set_lang_CountryCode() function in Wavlink AC3000 firmware version M33A8.V5030.210505. The flaw, assigned CWE-80, permits an unauthenticated remote attacker to supply a specially crafted HTTP request that executes arbitrary script in the context of a victim's browser session and can disclose sensitive information. The issue carries a CVSS 3.1 score of 9.6 reflecting network attack vector, low complexity, no required privileges, and required user interaction with changed scope and high impact on confidentiality, integrity, and availability.
An unauthenticated attacker can exploit the vulnerability simply by inducing a victim to visit a malicious link or by delivering a crafted request that the target device processes during login handling. Successful exploitation results in theft of session tokens, credentials, or other sensitive data exposed within the administrative interface.
Public references point to detailed analysis published by Cisco Talos under TALOS-2024-2017, which describes the technical root cause and reproduction steps but does not include vendor-supplied patches or mitigation guidance in the available information. The associated EPSS score has remained flat at 0.1065 with no observed increase since disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2024-38366
Vulnerability details
A cross-site scripting (xss) vulnerability exists in the login.cgi set_lang_CountryCode() functionality of Wavlink AC3000 M33A8.V5030.210505. A specially crafted HTTP request can lead to a disclosure of sensitive information. An attacker can make an unauthenticated HTTP request to trigger this vulnerability.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
XSS in public router web UI (login.cgi) directly enables remote exploitation of a public-facing app (T1190) via crafted links requiring user interaction, matching drive-by compromise (T1189) and spearphishing links (T1566.002) for sensitive data disclosure.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Information Input Validation directly prevents XSS by validating and sanitizing the CountryCode parameter in login.cgi to block malicious script injection.
Information Output Filtering encodes or escapes reflected content from set_lang_CountryCode() to prevent execution of injected scripts in user browsers.
Flaw Remediation identifies and patches the specific XSS vulnerability in Wavlink AC3000 firmware to eliminate the root cause.