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CVE-2021-23241

35
FAUCET Score

CVE-2021-23241 describes a Directory Traversal vulnerability in MERCUSYS Mercury X18G 1.0.5 devices, allowing attackers to access sensitive files like /etc/passwd by manipulating URIs with "../" and authentication bypass techniques. This medium-severity vulnerability has a CVSS score of 5.3, indicating low impact on confidentiality and no impact on integrity or availability, with no authentication required and low attack complexity. While not actively exploited in the wild and lacking Metasploit or ExploitDB entries, a Nuclei template exists for local file inclusion, and it has received minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
1.0.5CPE matchmatch criteria
cpe:2.3:o:mercusys:mercury_x18g_firmware:1.0.5:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
13.44%
Probability of exploitation in next 30 days
EPSS Percentile
96.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Nuclei: CVE-2021-23241 · Jul 20, 2021
This CVE's current EPSS score of 0.1344 is in the 95th percentile among its peer group of 23,723 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

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