CRITICALVulnerability
Verified
Global

NVD CRITICAL: CVE-2026-89009 — WAVLINK WN535M1 and WN535M3 routers running firmware prior to M35M1_V250922 cont...

·Source: NIST NVD

Updated:

Executive Summary

WAVLINK WN535M1 and WN535M3 routers running firmware prior to M35M1_V250922 contain an unauthenticated arbitrary file write vulnerability that allows remote attackers to overwrite any file on the device by sending a crafted payload to the sync_server daemon on TCP port 13136. The daemon, which runs as root and requires no authentication, accepts a 100-byte filename field in its protocol header wit

Analysis

WAVLINK WN535M1 and WN535M3 routers running firmware prior to M35M1_V250922 contain an unauthenticated arbitrary file write vulnerability that allows remote attackers to overwrite any file on the device by sending a crafted payload to the sync_server daemon on TCP port 13136. The daemon, which runs as root and requires no authentication, accepts a 100-byte filename field in its protocol header without path canonicalization, allowing attackers to supply an absolute path and write arbitrary content to overwrite startup scripts or credential stores to achieve persistent system compromise. CVSS Score: 9.1. Published: 2026-09-11T15:17:08.190.

Indicators of Compromise (1)

CVE (1)
CVE-2026-89009
NVDMITRE CVE
Source Attribution

Originally published by NIST NVD on Sep 11, 2026. Verified by: NIST.

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