CVE-2021-23241Public exploitNetwork attack vector

Unauthenticated file disclosure via path traversal

Published Jan 7, 2021 · Updated Aug 3, 2024

Directory traversal in MERCUSYS Mercury X18G 1.0.5 allows remote attackers to read files via crafted web-server URIs. The web server accepts ../ segments through loginLess or login.htm paths, including /loginLess/../../etc/passwd, while bypassing authentication. Exploitation requires network access to the device web service and results in confidentiality loss without reported integrity or availability impact.

CVSS severity5.3
Medium
EPSS probability13.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Directory traversal in MERCUSYS Mercury X18G 1.0.5 allows remote attackers to read files via crafted web-server URIs. The web server accepts ../ segments through loginLess or login.htm paths, including /loginLess/../../etc/passwd, while bypassing authentication. Exploitation requires network access to the device web service and results in confidentiality loss without reported integrity or availability impact.

The record

CVE
CVE-2021-23241
Published
Jan 7, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-22, T1083
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 7, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1083File and Directory Discovery

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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