Buffer overflow in Wavlink Wn530hg4b
CVE-2026-110958
A vulnerability was found in Wavlink WN530HG4B M30HG4B_V260724. The impacted element is an unknown function of the file api.cgi. The manipulation results in heap-based buffer overflow. It is possible to launch the attack remotely. The exploit has been made public and could be used. Upgrading to version 2026-09-24-841a51c6d5_tclinux.bin is sufficient to resolve this issue. The affected component should be upgraded. The vendor confirms: "We confirm the finding, and it has already been addressed. In the current firmware the api=info&client=app handler no longer builds a shell command: the login script is now invoked through an argument vector (execvp) instead of system(), and the client address is length-limited and null-checked."
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
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Wavlink Wn530hg4b — versions M30HG4B_V260724
Weakness classification (CWE)
References
- vuldb.com/vuln/420571 (vdb-entry)
- vuldb.com/vuln/420571/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-110958 (third-party-advisory)
- vuldb.com/submit/933388 (third-party-advisory)
- drive.google.com/file/d/12OOh8g9YDCbD-Q4cc52J6TH9KuOoD44A/view (exploit)
- dl.wavlink.com/firmware/RD/WN530BE2_WAVLINK-WO-2026-09-24-841a51c6d5_tclinux.bin (patch)
Frequently asked questions
- What is CVE-2026-110958?
- CVE-2026-110958 is a critical-severity vulnerability in Wavlink Wn530hg4b, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 10.0/10. Published 2026-10-15.
- How severe is CVE-2026-110958?
- Critical severity. CVSS v3 base score is 10.0 out of 10.