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Vulnerability record · CVE-2021-23241 · published 7 January 2021

CVE-2021-23241: Mercusys mercury x18g firmware path traversal vulnerability

Mercusys · Mercury X18g Firmware

MERCUSYS Mercury X18G 1.0.5 devices allow Directory Traversal via ../ in conjunction with a loginLess or login.htm URI (for authentication bypass) to the web server, as demonstrated by the /loginLess/../../etc/passwd URI.

5.3 CVSS 3.1 Medium EPSS 13% · top 3.7% CWE-22 · Path traversal
5.3CVSS 3.1 base score, v2 5.0
13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

MERCUSYS Mercury X18G 1.0.5 devices allow Directory Traversal via ../ in conjunction with a loginLess or login.htm URI (for authentication bypass) to the web server, as demonstrated by the /loginLess/../../etc/passwd URI.

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

Affected products

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

References

LinkTags
https://github.com/BATTZION/MY_REQUEST/blob/master/Mercury%20Router%20Web%20Server%20Directory%20Traversal.md ExploitThird Party Advisory
https://www.mercurycom.com.cn/product-521-1.html ProductVendor Advisory
https://www.mercusys.com/en/ Vendor Advisory
https://github.com/BATTZION/MY_REQUEST/blob/master/Mercury%20Router%20Web%20Server%20Directory%20Traversal.md ExploitThird Party Advisory
https://www.mercurycom.com.cn/product-521-1.html ProductVendor Advisory
https://www.mercusys.com/en/ Vendor Advisory

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Related vulnerabilities

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

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Source: NIST National Vulnerability Database (record CVE-2021-23241), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.