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Vulnerability record · CVE-2023-31473 · published 11 May 2023

CVE-2023-31473: Gl-inet gl-s20 firmware command injection vulnerability

Gl Inet · Gl S20 Firmware

An issue was discovered on GL.iNet devices before 3.216. There is an arbitrary file write in which an empty file can be created anywhere on the filesystem. This is caused by a command injection vulnerability with a filter applied. Through the software installation feature, it is possible to inject arbitrary parameters in a request to cause opkg to read an arbitrary file name while using root privileges. The -f option can be used with a configuration file.

4.9 CVSS 3.1 Medium EPSS 3.9% · top 10.2% CWE-77 · Command injection
4.9CVSS 3.1 base score
3.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
32Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

An issue was discovered on GL.iNet devices before 3.216. There is an arbitrary file write in which an empty file can be created anywhere on the filesystem. This is caused by a command injection vulnerability with a filter applied. Through the software installation feature, it is possible to inject arbitrary parameters in a request to cause opkg to read an arbitrary file name while using root privileges. The -f option can be used with a configuration file.

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

Affected products

32 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/gl-inet/CVE-issues/blob/main/3.215/Arbitrary_File_Read.md ExploitThird Party Advisory
https://www.gl-inet.com Vendor Advisory
https://github.com/gl-inet/CVE-issues/blob/main/3.215/Arbitrary_File_Read.md ExploitThird Party Advisory
https://www.gl-inet.com Vendor Advisory

Track CVE-2023-31473 inside VULONE

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2023-50919GL.iNet router NGINX authentication bypass via Lua pattern matchingGL.iNet devices before firmware 4.5.0 contain an authentication bypass in the NGINX web interface caused by improper Lua string pattern matching. A r…EPSS 48%analysed9.8CVE-2023-50921Gl-inet gl-mt1300 firmware improper privilege management vulnerabilityAn issue was discovered on GL.iNet devices through 4.5.0. Attackers can invoke the add_user interface in the system module to gain root privileges. T…EPSS 0.52%9.8CVE-2023-46454Gl-inet gl-ar300m firmware os command injection vulnerabilityIn GL.iNET GL-AR300M routers with firmware v4.3.7, it is possible to inject arbitrary shell commands through a crafted package name in the package in…EPSS 23%9.8CVE-2023-46456Gl-inet gl-ar300m firmware injection vulnerabilityIn GL.iNET GL-AR300M routers with firmware 3.216 it is possible to inject arbitrary shell commands through the OpenVPN client file upload functionali…EPSS 25%9.8CVE-2023-31475Gl-inet gl-s20 firmware classic buffer overflow vulnerabilityAn issue was discovered on GL.iNet devices before 3.216. The function guci2_get() found in libglutil.so has a buffer overflow when an item is request…EPSS 14%9.8CVE-2023-31471Gl-inet gl-s20 firmware vulnerabilityAn issue was discovered on GL.iNet devices before 3.216. Through the software installation feature, it is possible to install arbitrary software, suc…EPSS 1.1%7.8CVE-2023-50445Gl-inet gl-mt1300 firmware os command injection vulnerabilityShell Injection vulnerability GL.iNet A1300 v4.4.6, AX1800 v4.4.6, AXT1800 v4.4.6, MT3000 v4.4.6, MT2500 v4.4.6, MT6000 v4.5.0, MT1300 v4.3.7, MT300N…EPSS 9.1%7.5CVE-2023-46455GL.iNet GL-AR300M OpenVPN upload path traversal arbitrary file writeGL.iNet GL-AR300M routers running firmware v4.3.7 allow arbitrary file writes via a path traversal flaw in the OpenVPN client file upload feature. Be…EPSS 47%analysed

Source: NIST National Vulnerability Database (record CVE-2023-31473), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.