Security readout for executives and security teams
Plain-English summary
CVE-2021-27442 affects Weintek cMT EasyWeb interfaces used in industrial environments. An unauthenticated remote attacker could inject malicious JavaScript. If a vulnerable interface is reachable, this could compromise sensitive session data or alter what operators see and do through the web interface.
Executive priority
Prioritize this for OT asset review and perimeter reduction. The business concern is not only website-style script injection, but potential operator-session compromise or misleading interface behavior on industrial systems. Urgency is highest for internet-facing or remotely administered cMT deployments.
Technical view
The issue is CWE-79 cross-site scripting in Weintek cMT product lines. The CVSS 3.1 score is 9.4 with network access, low complexity, no privileges, and no user interaction listed. Affected versions are unspecified in the provided bundle, so model-level inventory is essential.
Likely exposure
Exposure is most likely where Weintek cMT EasyWeb interfaces are reachable from corporate networks, remote access paths, or the internet. The source bundle lists multiple cMT-SVR, cMT-G, cMT panel, cMT-HDM/FHD, and cMT-CTRL01 products, but does not provide exact affected firmware versions.
Exploitation context
The provided sources do not show CISA KEV listing or confirmed active exploitation. The risk remains high because the vulnerability is remotely reachable, unauthenticated, and rated critical. Treat internet-facing or broadly reachable OT web interfaces as the urgent exposure scenario.
Researcher notes
Evidence supports model-level affected products, CWE-79 classification, and critical CVSS. The provided bundle does not name exact affected firmware versions, exploit availability, or a specific patch level. Researchers should avoid assuming broader Weintek product impact without vendor confirmation.
Mitigation direction
- Identify all Weintek cMT devices and EasyWeb interfaces in OT and remote-access networks.
- Check CISA and Weintek guidance for affected versions, updates, and vendor-specific mitigations.
- Remove EasyWeb interfaces from direct internet exposure where possible.
- Restrict access with firewalls, VPN controls, and OT network segmentation.
- Monitor for unexpected EasyWeb access and suspicious script-like web requests.
Validation and detection
- Confirm whether deployed devices match the affected Weintek cMT product lines.
- Review firmware and EasyWeb versions against current Weintek advisories.
- Verify management interfaces are not exposed to the public internet.
- Validate firewall rules limit EasyWeb access to authorized administration paths.
- Document compensating controls where exact firmware status is unknown.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-27442 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L3.95.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.4CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://www.cisa.gov/uscert/ics/advisories/icsa-21-082-01CVE reference · x_refsource_MISC
- https://dl.weintek.com/public/Document/TEC/TEC21001E_cMT_EasyWeb_V1_Security_Issues.pdfCVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.