Security readout for executives and security teams
Plain-English summary
CVE-2021-33001 is a cross-site scripting issue in xArrow SCADA 7.2 and earlier. An attacker without login access may be able to make a user open crafted content that abuses the bdate parameter in xhisvalue.htm, potentially affecting data confidentiality and integrity in the SCADA web interface.
Executive priority
Treat this as a moderate ICS web-interface risk. It is not listed as known exploited in the provided sources, but SCADA exposure raises operational sensitivity. Prioritize asset confirmation, access restriction, and vendor-guided remediation.
Technical view
The issue is CWE-79 XSS in xArrow SCADA xhisvalue.htm via the bdate parameter. CVSS 3.1 is 6.1, with network access, low complexity, no privileges required, user interaction required, changed scope, low confidentiality impact, low integrity impact, and no availability impact.
Likely exposure
Organizations running xArrow SCADA 7.2 or earlier are the known exposure group. Risk is higher where SCADA web interfaces are reachable by broad internal users, remote access paths, or less-trusted networks.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. The CVSS vector indicates exploitation requires convincing a user to interact with crafted content, so this is not described as a fully unauthenticated direct compromise path.
Researcher notes
Evidence identifies the vulnerable parameter and resource but does not include exploit details or a named fixed release in the provided bundle. Avoid assuming affected CPEs or patch versions beyond xArrow SCADA 7.2 and prior.
Mitigation direction
- Check CISA and vendor guidance for the fixed version or official workaround.
- Inventory xArrow SCADA deployments and prioritize versions 7.2 and earlier.
- Restrict SCADA web interface access to trusted administrative networks.
- Apply least-privilege access controls around SCADA operator workstations.
- Monitor vendor advisories for updated remediation instructions.
Validation and detection
- Confirm whether xArrow SCADA is present in asset inventory.
- Record installed xArrow SCADA versions and flag 7.2 or earlier.
- Verify xhisvalue.htm is not exposed to untrusted networks.
- Review web logs for unusual xhisvalue.htm bdate parameter activity.
- Validate remediation in a test environment before production rollout.
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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-33001 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
- 6.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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:N/UI:R/S:C/C:L/I:L/A:N2.82.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.cisa.gov/uscert/ics/advisories/icsa-21-229-03CVE 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.