CVE-2026-18601Public exploitNetwork attack vector

Unauthenticated root command execution via filename injection

Published Aug 3, 2026 · Updated Aug 3, 2026

Command injection in GL.iNet Beryl AX firmware 4.4.0 through 4.4.5 allows remote attackers to execute commands as root via filename. The ovpn-client.check_config method in /cgi-bin/glc inserts the filename into a single-quoted tar command and passes it to system() without neutralizing quotes or shell metacharacters. No authentication or prior upload is required; one crafted HTTP request breaks the quote boundary and runs arbitrary commands with root privileges.

CVSS severity9.8
Critical
EPSS probability2.38%
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 GL.iNet Beryl AX firmware 4.4.0 through 4.4.5 allows remote attackers to execute commands as root via filename. The ovpn-client.check_config method in /cgi-bin/glc inserts the filename into a single-quoted tar command and passes it to system() without neutralizing quotes or shell metacharacters. No authentication or prior upload is required; one crafted HTTP request breaks the quote boundary and runs arbitrary commands with root privileges.

The record

CVE
CVE-2026-18601
Published
Aug 3, 2026
Updated
Aug 3, 2026
Vendor
GL.iNet
Product
GL-MT3000
Classifications
CWE-77, CWE-74, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2026Record 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=4.4.0
  2. Affected versionversion=4.4.1
  3. Affected versionversion=4.4.2
  4. Affected versionversion=4.4.3
  5. Affected versionversion=4.4.4
  6. Affected versionversion=4.4.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

GL.iNet · GL-MT3000version=4.4.0; version=4.4.1; version=4.4.2; version=4.4.3; version=4.4.4; version=4.4.5

Published CVSS scores

10.0VulDB CNAAV:N/AC:L/Au:N/C:C/I:C/A:C
9.8VulDB CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.9VulDB CNACVSS: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:P

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 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')
T1190Exploit Public-Facing Application

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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