CVE-2026-3612Public exploitNetwork attack vector

Authenticated root command execution via firmware URL

Published Mar 6, 2026 · Updated Mar 6, 2026

Command injection in Wavlink WL-NU516U1 V240425 allows remote authenticated users to execute arbitrary commands through the OTA interface. The sub_405AF4 handler inserts the firmware_url POST value into a double-quoted sprintf-built shell command and passes it to system(), leaving $() and backtick substitution active. A valid session cookie is required, and successful injection executes commands with root control of the appliance.

CVSS severity7.2
High
EPSS probability12.67%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in Wavlink WL-NU516U1 V240425 allows remote authenticated users to execute arbitrary commands through the OTA interface. The sub_405AF4 handler inserts the firmware_url POST value into a double-quoted sprintf-built shell command and passes it to system(), leaving $() and backtick substitution active. A valid session cookie is required, and successful injection executes commands with root control of the appliance.

The record

CVE
CVE-2026-3612
Published
Mar 6, 2026
Updated
Mar 6, 2026
Vendor
Wavlink
Product
WL-NU516U1
Classifications
CWE-77, CWE-74, T1059.004
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Mar 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 6, 2026Record 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=V240425

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Wavlink · WL-NU516U1version=V240425

Published CVSS scores

8.3VulDBAV:N/AC:L/Au:M/C:C/I:C/A:C
7.3VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
7.2VulDBCVSS:3.1/AV:N/AC:L/PR:H/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 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 exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
T1059.004Unix Shell

Public exploit references

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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