Cyber Resilience

CVE-2021-23241

MediumPublic PoC

Published: 07 January 2021

Published
07 January 2021
Modified
21 November 2024
KEV Added
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Patch
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CVSS Score v3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS Score 0.7111 98.7th percentile
Risk Priority 53 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-23241 is a medium-severity Path Traversal (CWE-22) vulnerability in Mercusys Mercury X18G Firmware. Its CVSS base score is 5.3 (Medium).

Operationally, ranked in the top 1.3% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

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.

CWE(s)
CWE-22

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

mercusys
mercury x18g firmware
1.0.5

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SI-10 Information Input Validation
addresses: CWE-22

Validates pathnames and filenames to prevent traversal outside intended directories.

References