Buffer overflow in Wavlink Wn531p3
CVE-2026-74843
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.010 (62.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 62.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.010 · change: +0.005
Affected products
- Wavlink Wn531p3 — versions V250922
- Wavlink Wn535m1 — versions V250922
Weakness classification (CWE)
References
- vuldb.com/vuln/391205 (technical-description, vdb-entry)
- vuldb.com/vuln/391205/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-74843 (third-party-advisory)
- vuldb.com/submit/875331 (third-party-advisory)
- github.com/wcndsb-sketch/WAVLINK_WN535M1-M35M1_V250922-Buffer-Overflow/blob/mai… (exploit)
Frequently asked questions
- What is CVE-2026-74843?
- CVE-2026-74843 is a critical-severity vulnerability in Wavlink Wn531p3, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 10.0/10. Published 2026-08-17.
- How severe is CVE-2026-74843?
- Critical severity. CVSS v3 base score is 10.0 out of 10.