CVE-2021-23241

Name: CVE-2021-23241
Creator: NVD / NIST
Published: 2021-01-07T21:15:14.04+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 13.44%

Last modified Jun 17, 2026

CVE-2021-23241 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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.. EPSS estimates a 13.44% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

13.44%

95.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Mercusys	Mercury X18g Firmware	1.0.5

References

https://github.com/BATTZION/MY_REQUEST/blob/master/Mercury%20Router%20Web%20Server%20Directory%20Traversal.mdExploit, Third Party Advisory
https://www.mercurycom.com.cn/product-521-1.htmlProduct, Vendor Advisory
https://www.mercusys.com/en/Vendor Advisory
https://github.com/BATTZION/MY_REQUEST/blob/master/Mercury%20Router%20Web%20Server%20Directory%20Traversal.mdExploit, Third Party Advisory
https://www.mercurycom.com.cn/product-521-1.htmlProduct, Vendor Advisory
https://www.mercusys.com/en/Vendor Advisory

Timeline

Published: Jan 7, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-23241?

How severe is CVE-2021-23241?

CVE-2021-23241 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 13.44% probability of exploitation in the next 30 days.

How do I fix CVE-2021-23241?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-23241?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST