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Vulnerability record · CVE-2023-39239 · published 7 September 2023

CVE-2023-39239: Asus rt-ax55 firmware vulnerability

Asus · Rt Ax55 Firmware

It is identified a format string vulnerability in ASUS RT-AX56U V2’s General function API. This vulnerability is caused by lacking validation for a specific value within its apply.cgi module. A remote attacker with administrator privilege can exploit this vulnerability to perform remote arbitrary code execution, arbitrary system operation or disrupt service.

7.2 CVSS 3.1 High EPSS 1.3% · top 30.8% CWE-134 · CWE-134
7.2CVSS 3.1 base score
1.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

It is identified a format string vulnerability in ASUS RT-AX56U V2’s General function API. This vulnerability is caused by lacking validation for a specific value within its apply.cgi module. A remote attacker with administrator privilege can exploit this vulnerability to perform remote arbitrary code execution, arbitrary system operation or disrupt service.

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

Affected products

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

References

LinkTags
https://https://www.twcert.org.tw/tw/cp-132-7355-0ce8d-1.html Broken Link
https://https://www.twcert.org.tw/tw/cp-132-7355-0ce8d-1.html Broken Link

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Related vulnerabilities

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

8.8CVE-2023-39780ASUS RT-AX55 Router OS Command Injection via qos_bw_rulelistASUS RT-AX55 firmware 3.0.0.4.386.51598 fails to sanitize the qos_bw_rulelist parameter on /start_apply.htm, allowing OS command injection. An attack…KEVEPSS 40%analysed9.8CVE-2023-35087Asus rt-ac86u firmware vulnerabilityIt is identified a format string vulnerability in ASUS RT-AX56U V2 & RT-AC86U. This vulnerability is caused by lacking validation for a specific valu…EPSS 1.1%9.8CVE-2022-26376Asuswrt out-of-bounds write vulnerabilityA memory corruption vulnerability exists in the httpd unescape functionality of Asuswrt prior to 3.0.0.4.386_48706 and Asuswrt-Merlin New Gen prior t…EPSS 1.4%9.8CVE-2021-41435Asus gt-ax11000 firmware improper restriction of authentication attempts vulnerabilityA brute-force protection bypass in CAPTCHA protection in ASUS ROG Rapture GT-AX11000, RT-AX3000, RT-AX55, RT-AX56U, RT-AX56U_V2, RT-AX58U, RT-AX82U, …EPSS 6.5%9.8CVE-2018-8826Asus rt-ac51u firmware improper input validation vulnerabilityASUS RT-AC51U, RT-AC58U, RT-AC66U, RT-AC1750, RT-ACRH13, and RT-N12 D1 routers with firmware before 3.0.0.4.380.8228; RT-AC52U B1, RT-AC1200 and RT-N…EPSS 4.2%9.8CVE-2018-9285Asus rt-ac66u firmware os command injection vulnerabilityMain_Analysis_Content.asp in /apply.cgi on ASUS RT-AC66U, RT-AC68U, RT-AC86U, RT-AC88U, RT-AC1900, RT-AC2900, and RT-AC3100 devices before 3.0.0.4.38…EPSS 3.6%9.0CVE-2021-43702Asus zenwifi xd4s firmware cross-site scripting vulnerabilityASUS RT-A88U 3.0.0.4.386_45898 is vulnerable to Cross Site Scripting (XSS). The ASUS router admin panel does not sanitize the WiFI logs correctly, if…EPSS 0.98%8.8CVE-2023-41347Asus rt-ax55 firmware os command injection vulnerabilityASUS RT-AX55’s authentication-related function has a vulnerability of insufficient filtering of special characters within its check token module. An …EPSS 1.3%

Source: NIST National Vulnerability Database (record CVE-2023-39239), CISA KEV, FIRST EPSS (scores of 2026-10-11). This page is refreshed as NVD updates the record.