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Vulnerability record · CVE-2023-31475 · published 11 May 2023

CVE-2023-31475: Gl-inet gl-s20 firmware classic buffer overflow vulnerability

Gl Inet · Gl S20 Firmware

An 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 requested from a UCI context, and the value is pasted into a char pointer to a buffer without checking the size of the buffer.

9.8 CVSS 3.1 Critical EPSS 14% · top 3.6% CWE-120 · Classic buffer overflow
9.8CVSS 3.1 base score
14%EPSS exploitation probability, 30 days
NoNot in CISA KEV
32Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

An 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 requested from a UCI context, and the value is pasted into a char pointer to a buffer without checking the size of the buffer.

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

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/Buffer_Overflow.md ExploitThird Party Advisory
https://justinapplegate.me/2023/glinet-CVE-2023-31475/
https://www.gl-inet.com Vendor Advisory
https://github.com/gl-inet/CVE-issues/blob/main/3.215/Buffer_Overflow.md ExploitThird Party Advisory
https://justinapplegate.me/2023/glinet-CVE-2023-31475/
https://www.gl-inet.com Vendor Advisory

Track CVE-2023-31475 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-2023-31471Gl-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%analysed7.5CVE-2023-31477Gl-inet gl-s20 firmware path traversal vulnerabilityA path traversal issue was discovered on GL.iNet devices before 3.216. Through the file sharing feature, it is possible to share an arbitrary directo…EPSS 0.94%

Source: NIST National Vulnerability Database (record CVE-2023-31475), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.