CVE-2021-27442Network attack vector

Unauthenticated JavaScript injection through EasyWeb

Published May 16, 2022 · Updated Apr 16, 2025

Cross-site scripting in EasyWeb V1.1 on Weintek cMT devices allows remote attackers to inject malicious JavaScript over the network. The vendor identifies the unpatched EasyWeb web service but does not disclose the endpoint, parameter, or whether the payload is stored or reflected. The service is exposed without authentication when an open network permits access, and the published record does not specify consequences beyond injected JavaScript.

CVSS severity9.4
Critical
EPSS probability0.91%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in EasyWeb V1.1 on Weintek cMT devices allows remote attackers to inject malicious JavaScript over the network. The vendor identifies the unpatched EasyWeb web service but does not disclose the endpoint, parameter, or whether the payload is stored or reflected. The service is exposed without authentication when an open network permits access, and the published record does not specify consequences beyond injected JavaScript.

The record

CVE
CVE-2021-27442
Published
May 16, 2022
Updated
Apr 16, 2025
Vendor
Weintek
Product
cMT-G03/G04
Classifications
CWE-79, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 16, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 16, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <20210222

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Weintek · cMT-G03/G04version=unspecified <20210222
Weintek · cMT-G01/G02version=unspecified <20210209
Weintek · cMT-HDMversion=unspecified <20210204
Weintek · cMT-CTRL01version=unspecified <20210302
Weintek · cMT3071/cMT3072/cMT3090/cMT3103/cMT3151version=unspecified <20210218
Weintek · cMT-FHDversion=unspecified <20210208
Weintek · cMT-SVRversion=unspecified <20210305

Published CVSS scores

9.4ICS-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Cross-site Scripting
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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