CVE-2024-39754Network attack vector

Unauthenticated root access via hardcoded UDP backdoor

Published Jan 14, 2025 · Updated Jan 14, 2025

Hidden functionality in Wavlink AC3000 firmware M33A8.V5030.210505 allows remote attackers to gain root access via UDP packets. The wctrls service on UDP port 36338 accepts an AES-protected hardcoded command sequence that enables telnet, while the firmware contains an always-present static root account. Any host that can reach the UDP service can activate telnet on port 2323 and obtain a root shell, including when the service is exposed to the WAN.

CVSS severity10.0
Critical
EPSS probability1.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Hidden functionality in Wavlink AC3000 firmware M33A8.V5030.210505 allows remote attackers to gain root access via UDP packets. The wctrls service on UDP port 36338 accepts an AES-protected hardcoded command sequence that enables telnet, while the firmware contains an always-present static root account. Any host that can reach the UDP service can activate telnet on port 2323 and obtain a root shell, including when the service is exposed to the WAN.

The record

CVE
CVE-2024-39754
Published
Jan 14, 2025
Updated
Jan 14, 2025
Vendor
Wavlink
Product
AC3000 Tri-band Wi-Fi Router
Classifications
CWE-912, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 14, 2025CVE publishedPublication date reported by the CVE source.
  2. Jan 14, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=M33A8.V5030.210505

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Wavlink · AC3000 Tri-band Wi-Fi Routerversion=M33A8.V5030.210505

Published CVSS scores

10.0Cisco TalosCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-912Hidden Functionality
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo