Security readout for executives and security teams
Plain-English summary
This is a browser-based injection issue. If a user is tricked into interacting with malicious content, an attacker could run JavaScript in that user’s session, potentially stealing session tokens, redirecting the browser, or causing unintended actions. The reported severity is medium.
Executive priority
Treat this as a moderate operational-security issue. It is unlikely to justify emergency shutdown by itself, but exposed or privileged HMI sessions should be reviewed promptly because stolen sessions or unintended browser actions can affect operational trust.
Technical view
The bundle describes a CWE-79 cross-site scripting vulnerability with CVSS 3.1 score 5.4: network reachable, low complexity, no privileges required, user interaction required, and low confidentiality/integrity impact. Product naming is inconsistent between the title and affected field, so scoping should be confirmed against the cited CVE and CISA records.
Likely exposure
Exposure is most relevant for organizations using the named HMI/DAQ software where operators or administrators access browser-based interfaces. The source bundle does not establish internet exposure, exploit availability, or whether all deployments are practically reachable.
Exploitation context
The bundle does not report active exploitation, and KEV status is false. Exploitation requires user interaction and appears focused on session or browser action abuse rather than direct system takeover or availability impact.
Researcher notes
Evidence is limited to a CVE description, CVSS vector, CWE-79 classification, and a CISA ICS advisory reference. The bundle contains inconsistent product naming, so avoid broad claims until the advisory and CVE record are reconciled.
Mitigation direction
- Review the vendor and CISA advisory for confirmed product scope and remediation guidance.
- Prioritize remediation for systems with browser-accessible operator or administrator sessions.
- Restrict access to affected interfaces to trusted networks and users.
- Monitor vendor advisories for patches or supported configuration mitigations.
Validation and detection
- Inventory deployments matching the cited product names and versions.
- Confirm whether affected interfaces are reachable from user workstations or untrusted networks.
- Check whether browser sessions carry privileged operational access.
- Verify remediation status against the cited CISA and CVE records.
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-2021-42703 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
- Medium
- CVSS
- 5.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
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:R/S:U/C:L/I:L/A:N2.82.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.4MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://us-cert.cisa.gov/ics/advisories/icsa-21-173-01CVE reference · x_refsource_MISC
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.