TN-5900 Series User Enumeration Vulnerability

published 2023-07-05 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-44004

cvss: 5.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.6%; EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits: 0; none known

TN-5900 Series version 3.3 and prior versions is vulnearble to user enumeration vulnerability. The vulnerability may allow a remote attacker to determine whether a user is valid during password recovery through the web login page and enable a brute force attack with valid users.

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 23 mo ago (2024-11-20)

Exploit prediction

0.61% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

Moxa TN-5900 Series
moxa tn-5900

Classification

Weakness

CWE-204 Observable Response Discrepancy
CWE-203 Observable Discrepancy

References

moxa.com /en/support/product-support/security-advisory/mpsa-230401-tn-5900-series-user-enumeration-vulnerability
vendor-advisory

Sources

CVE List CVE-2023-3336
NVD CVE-2023-3336

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Summary