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9.3

Wavlink WN531P3/WN535M1: Remote Code Execution via Cookie Overflow

CVE-2026-74843 · published 18 days ago
Summary

The Export Pingortrace CGI feature in Wavlink WN531P3 and WN535M1 devices is vulnerable to a remote attack. An attacker can exploit this vulnerability by sending a specially crafted cookie, potentially allowing them to execute unauthorized code on the device. We recommend that you contact Wavlink's support team to request a software update to fix this issue.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
wavlink wn531p3 V250922
wavlink wn535m1 V250922
Original advisory text
Wavlink WN531P3/WN535M1 Export Pingortrace CGI export_pingortrace.cgi strcpy stack-based overflow
A vulnerability was determined in Wavlink WN531P3 and WN535M1 V250922. Affected by this vulnerability is the function strcpy of the file /etc/lighttpd/www/cgi-bin/export_pingortrace.cgi of the component Export Pingortrace CGI. Executing a manipulation of the argument HTTP_COOKIE can lead to stack-based buffer overflow. The attack may be launched remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure.
References
Severity
9.3 Critical
CVSS 3.1: 10.0 (MITRE)
Exploitation
EPSS <1%
Type
CWE-121Stack-based Buffer Overflow
CWE-119Buffer Overflow
Timeline
Published17 Aug 2026
Updated3 Sep 2026
First seen17 Aug 2026
Sources
CVE-2026-74843 · NVD
CVE-2026-74843 · MITRE
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