What is CVE-2021-27442?

CVE-2021-27442 is a critical-severity vulnerability in Weintek Cmt3071, classified under Cross-site Scripting. CVSS score: 9.4/10. Published 2022-05-16.

How severe is CVE-2021-27442?

Critical severity. CVSS v3 base score is 9.4 out of 10.

XSS in Weintek Cmt3071

CVE-2021-27442

The Weintek cMT product line is vulnerable to a cross-site scripting vulnerability, which could allow an unauthenticated remote attacker to inject malicious JavaScript code.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2022-05-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.4 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L.

EPSS exploit prediction

EPSS: 0.009 (58.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.3% 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

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.cisa.gov/uscert/ics/advisories/icsa-21-082-01 (US Government Resource, Third Party Advisory)
dl.weintek.com/public/Document/TEC/TEC21001E_cMT_EasyWeb_V1_Security_Issues.pdf (Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2021-27442?: CVE-2021-27442 is a critical-severity vulnerability in Weintek Cmt3071, classified under Cross-site Scripting. CVSS score: 9.4/10. Published 2022-05-16.
How severe is CVE-2021-27442?: Critical severity. CVSS v3 base score is 9.4 out of 10.