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Vulnerability record · CVE-2021-23242 · published 7 January 2021

CVE-2021-23242: Mercusys mercury x18g firmware path traversal vulnerability

Mercusys · Mercury X18g Firmware

MERCUSYS Mercury X18G 1.0.5 devices allow Directory Traversal via ../ to the UPnP server, as demonstrated by the /../../conf/template/uhttpd.json URI.

5.3 CVSS 3.1 Medium EPSS 1.8% · top 22.3% CWE-22 · Path traversal
5.3CVSS 3.1 base score, v2 5.0
1.8%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 ../ to the UPnP server, as demonstrated by the /../../conf/template/uhttpd.json 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%20Upnp%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%20Upnp%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.

7.5CVE-2021-25811Mercusys mercury x18g firmware vulnerabilityMERCUSYS Mercury X18G 1.0.5 devices allow Denial of service via a crafted value to the POST listen_http_lan parameter. Upon subsequent device restart…EPSS 1.6%6.1CVE-2021-25810Mercusys mercury x18g firmware cross-site scripting vulnerabilityCross site Scripting (XSS) vulnerability in MERCUSYS Mercury X18G 1.0.5 devices, via crafted values to the 'src_dport_start', 'src_dport_end', and 'd…EPSS 1.1%5.3CVE-2021-23241Mercusys mercury x18g firmware path traversal vulnerabilityMERCUSYS Mercury X18G 1.0.5 devices allow Directory Traversal via ../ in conjunction with a loginLess or login.htm URI (for authentication bypass) to…EPSS 13%9.8CVE-2026-93616Checkpoint multi-domain security management path traversal vulnerabilityA directory traversal and file upload vulnerability allows an unauthenticated attacker to upload and execute arbitrary scripts on Check Point Managem…KEVEPSS 20%10.0CVE-2026-85706GitLab CE/EE repository commits API path traversal allows unauthenticated file readGitLab CE/EE contains improper path confinement and missing authentication enforcement in the repository commits API, allowing an unauthenticated use…KEVEPSS 91%analysed5.3CVE-2026-66384JFrog Artifactory path traversal in Docker cache pathAn authenticated user can write data outside the intended Docker cache path under specific remote-repository conditions in JFrog Artifactory. The fla…KEVEPSS 0.66%analysed9.8CVE-2026-59310VMware vCenter Syslog server path traversal leads to RCEVMware vCenter's Syslog server is affected by a directory traversal flaw (CWE-22) that allows a remote, unauthenticated attacker to execute arbitrary…KEVEPSS 2.6%analysed10.0CVE-2026-48282Adobe ColdFusion path traversal leads to remote code executionColdFusion versions 2025.9, 2023.20 and earlier contain a path traversal flaw (CWE-22) that allows an unauthenticated remote attacker to reach files …KEVEPSS 42%analysed

Source: NIST National Vulnerability Database (record CVE-2021-23242), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.