Security readout for executives and security teams
Plain-English summary
Delta Electronics DIALink 1.2.4.0 and prior has an authenticated cross-site scripting flaw in an API maintenance supplier parameter. A user with high privileges could inject JavaScript, with limited confidentiality and integrity impact reported. The source also says this may allow remote code execution, but provides no exploit details in the bundle.
Executive priority
Treat this as a moderate operational security issue. It is not reported as actively exploited, but it affects an industrial vendor product and involves privileged authenticated access. Prioritize inventory, access review, and vendor remediation tracking over emergency response unless local evidence suggests misuse.
Technical view
CVE-2021-38403 is CWE-79 in DIALink. The CVSS 3.1 vector is AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N, score 5.5. The issue requires authenticated high-privilege access and affects the supplier parameter of the API maintenance function. Availability impact is not reported.
Likely exposure
Exposure is likely limited to organizations running Delta Electronics DIALink 1.2.4.0 or prior where authenticated users can reach API maintenance features. The bundle does not identify internet exposure, default configurations, or specific deployment patterns.
Exploitation context
The CVE is not listed as KEV in the provided bundle, and no cited source claims active exploitation. Exploitation requires authenticated high privileges, which lowers broad external risk but still matters where administrator accounts or shared operational access are weakly controlled.
Researcher notes
The source bundle does not provide patch version details, exploit mechanics, or proof-of-concept information. The remote-code-execution statement comes from the CVE description; the available technical detail only identifies authenticated XSS in the supplier parameter.
Mitigation direction
- Check the CISA advisory and Delta guidance for confirmed fixes or mitigations.
- Upgrade beyond affected DIALink versions when vendor guidance identifies a fixed release.
- Restrict API maintenance access to trusted administrative users only.
- Review DIALink accounts and remove unnecessary high-privilege access.
- Monitor for suspicious supplier parameter changes or unexpected script-like content.
Validation and detection
- Inventory DIALink deployments and record exact installed versions.
- Confirm whether version 1.2.4.0 or prior is present.
- Verify who can access the API maintenance function.
- Review recent maintenance records for unexpected supplier field changes.
- Confirm remediation status against CISA and Delta guidance.
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-2021-38403 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
- 5.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/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:H/UI:N/S:C/C:L/I:L/A:N2.32.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://us-cert.cisa.gov/ics/advisories/icsa-21-294-02CVE 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.