What is CVE-2021-3014?

CVE-2021-3014 is a medium-severity vulnerability in Mikrotik Routeros, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-01-04.

How severe is CVE-2021-3014?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Mikrotik Routeros

CVE-2021-3014

In MikroTik RouterOS through 2021-01-04, the hotspot login page is vulnerable to reflected XSS via the target parameter.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-01-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.009 (59.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 59.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Mikrotik Routeros

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

m4dm0e.github.io/2021/01/04/mikrotik-xss-reflected.html (Exploit, Third Party Advisory)
github.com/M4DM0e/m4dm0e.github.io/blob/gh-pages/_posts/2021-01-04-mikrotik-xss… (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-3014?: CVE-2021-3014 is a medium-severity vulnerability in Mikrotik Routeros, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-01-04.
How severe is CVE-2021-3014?: Medium severity. CVSS v3 base score is 6.1 out of 10.