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9.3

Wavlink WN530HG4B router allows remote code execution

CVE-2026-110958 · published today
Summary

The firmware on the Wavlink WN530HG4B router contains a flaw in the api.cgi component that can be triggered over the network, potentially letting an attacker run code on the device. The problem has been fixed in the September 2026 firmware update, which removes the unsafe command handling and adds proper input checks. Apply the latest firmware update to eliminate the risk.

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 wn530hg4b M30HG4B_V260724
Original advisory text
Wavlink WN530HG4B api.cgi heap-based overflow
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."
References
Fix within
Internet-facing 3 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically (estimated)
  • Gives an attacker full control (estimated)
Severity
9.3 Critical
Type
CWE-122Heap-based Buffer Overflow
CWE-119Buffer Overflow
Timeline
Published15 Oct 2026
Updated15 Oct 2026
First seen15 Oct 2026
Sources
CVE-2026-110958 · NVD
CVE-2026-110958 · MITRE
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