RCE in Gl.inet Gl-Mt3000
CVE-2026-12187
A security vulnerability has been detected in GL.iNet GL-MT3000 up to 4.4.5. Affected by this vulnerability is an unknown functionality of the file /usr/bin/one_click_upgrade of the component Online Firmware Upgrade Handler. Such manipulation leads to command injection. The attack can be launched remotely. The exploit has been disclosed publicly and may be used. Upgrading to version 4.7 addresses this issue. Upgrading the affected component is advised. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.019 (80.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 80.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000
Affected products
- Gl.inet Gl-Mt3000 — versions 4.4.0, 4.4.1, 4.4.2
Weakness classification (CWE)
References
- fw.gl-inet.com/firmware/mt3000/release/mt3000-4.8.1-0819-1755615825.tar (patch)
- github.com/StrTzz123/iot_vul/tree/main/GL-iNet/MT3000/4.4.5/upgrade_online_url (exploit, patch)
- vuldb.com/cve/CVE-2026-12187 (third-party-advisory)
- vuldb.com/submit/815654 (third-party-advisory)
- vuldb.com/vuln/370833 (vdb-entry)
- vuldb.com/vuln/370833/cti (signature, permissions-required)
Frequently asked questions
- What is CVE-2026-12187?
- CVE-2026-12187 is a high-severity vulnerability in Gl.inet Gl-Mt3000, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 8.8/10. Published 2026-06-14.
- How severe is CVE-2026-12187?
- High severity. CVSS v3 base score is 8.8 out of 10.