What is CVE-2023-3336?

CVE-2023-3336 is a medium-severity vulnerability in Moxa Tn-5900, classified under Observable Response Discrepancy. CVSS score: 5.3/10. Published 2023-07-05.

How severe is CVE-2023-3336?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Moxa Tn-5900

CVE-2023-3336

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.

Published 2023-07-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.006 (48.1th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Weakness classification (CWE)

References

www.moxa.com/en/support/product-support/security-advisory/mpsa-230401-tn-5900-s… (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2023-3336?: CVE-2023-3336 is a medium-severity vulnerability in Moxa Tn-5900, classified under Observable Response Discrepancy. CVSS score: 5.3/10. Published 2023-07-05.
How severe is CVE-2023-3336?: Medium severity. CVSS v3 base score is 5.3 out of 10.