CVE-2024-39781Network attack vector

Authenticated command execution via crontab injection

Published Jan 14, 2025 · Updated Nov 3, 2025

OS command injection in Wavlink AC3000 firmware M33A8.V5030.210505 allows remote authenticated users to execute arbitrary commands. The adm.cgi sch_reboot() handler inserts the restart_hour POST value into an SCH_Reboot crontab entry without validating or neutralizing crontab syntax, and sch_reboot.sh appends that entry to the adm2860 user's crontab. A valid administrator session is required; successful injection executes commands with the router service's privileges and can alter data or interrupt service.

CVSS severity9.1
Critical
EPSS probability4.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in Wavlink AC3000 firmware M33A8.V5030.210505 allows remote authenticated users to execute arbitrary commands. The adm.cgi sch_reboot() handler inserts the restart_hour POST value into an SCH_Reboot crontab entry without validating or neutralizing crontab syntax, and sch_reboot.sh appends that entry to the adm2860 user's crontab. A valid administrator session is required; successful injection executes commands with the router service's privileges and can alter data or interrupt service.

The record

CVE
CVE-2024-39781
Published
Jan 14, 2025
Updated
Nov 3, 2025
Vendor
Wavlink
Product
AC3000 Tri-band Wi-Fi Router
Classifications
CWE-77, T1053.003
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jan 14, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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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 privilegesadmin

What is affected?

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

Published CVSS scores

9.1Cisco TalosCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1053.003Scheduled Task/Job: Cron

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

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Your stack

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