EUVD-2026-76130
GHSA-22gq-jjvp-2jc9
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Unauthenticated network-reachable command injection with no interaction yields full root control, so AV:N/AC:L/PR:N/UI:N and C/I/A:H; scope unchanged as the daemon already runs as root on the same host.
Primary rating from Vendor (vulncheck).
CVSS VectorVendor: vulncheck
Lifecycle Timeline
2DescriptionCVE.org
WAVLINK WN535M1 and WN535M3 routers running firmware prior to M35M1_V250922 contain an unauthenticated OS command injection vulnerability that allows remote attackers to execute arbitrary commands as root by sending crafted filenames to the sync_server daemon on TCP port 13136. The daemon interpolates attacker-controlled filename input containing shell metacharacters into a shell command string via sprintf() and passes it to system() without sanitization, enabling root-level command execution on the device.
AnalysisAI
Unauthenticated root-level remote code execution affects WAVLINK WN535M1 and WN535M3 routers running firmware prior to M35M1_V250922. The sync_server daemon listening on TCP port 13136 builds a shell command via sprintf() using an attacker-supplied filename and passes it to system() without sanitization, so a crafted filename containing shell metacharacters yields arbitrary command execution as root. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to the sync_server daemon on TCP port 13136 of a WAVLINK WN535M1 or WN535M3 running firmware earlier than M35M1_V250922; no authentication, credentials, or user interaction are needed (PR:N/UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine top-priority issue, not an inflated CVSS number. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: firmware M35M1_V250922 - upgrade both WN535M1 and WN535M3 devices to this or later firmware, obtained from WAVLINK (https://docs.wavlink.xyz/) and described in the VulnCheck advisory. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all WAVLINK WN535M1 and WN535M3 routers in your network asset inventory. …
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Same weakness CWE-78 – OS Command Injection
View allSame technique Command Injection
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External POC / Exploit Code
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