Security readout for executives and security teams
Plain-English summary
This flaw lets an unauthenticated remote attacker delete arbitrary files on affected ECOA building automation controllers. The business impact is mainly disruption: deleted files could break controller functions, causing denial of service in connected building systems. The sources do not provide evidence of active exploitation.
Executive priority
Treat as urgent for any exposed or operationally critical building automation environment. Prioritize isolation and vendor follow-up because the vulnerability requires no login and can disrupt affected devices.
Technical view
CVE-2021-41294 is a CWE-22 path traversal issue in multiple ECOA BAS-related products. A specific GET parameter can be abused without authentication to traverse file paths and delete arbitrary files. CVSS 3.1 is 9.1 with network access, low complexity, no privileges, and high integrity and availability impact.
Likely exposure
Exposure is most concerning where ECOA BAS controllers or related RiskBuster, RiskTerminator, SmartHome II, Graphic Control Software, or ECS Router Controller systems are reachable over untrusted networks. Internet exposure would materially increase risk, but the provided sources do not quantify deployment prevalence.
Exploitation context
The public description states unauthenticated remote arbitrary file deletion using a GET parameter. CISA KEV status in the bundle is false, and no cited source confirms active exploitation, public exploit availability, or real-world incidents.
Researcher notes
Evidence is limited to the CVE description, affected product list, CVSS vector, CWE-22 classification, and TWCERT reference. The sources do not name a patch, workaround, exploit proof, or exploitation telemetry, so remediation should be verified against vendor advisories.
Mitigation direction
- Check ECOA or TWCERT guidance for product-specific fixes or replacement advice.
- Remove affected controllers from internet exposure and restrict management access to trusted networks.
- Use firewall or VPN controls to limit access to controller web interfaces.
- Maintain current backups of controller configuration and operational files.
- Monitor for unexpected file deletion, service failures, or configuration loss.
Validation and detection
- Inventory ECOA BAS products and match them against the affected product list.
- Confirm firmware or software versions with vendor documentation where available.
- Review network paths to identify internet or third-party access to controller interfaces.
- Check logs and operational alarms for unexplained file loss or service disruption.
- Verify backups can restore controller configuration and required operational files.
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-22: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. 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 lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-41294 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
- 9.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
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:N/I:H/A:H3.95.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.1CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.twcert.org.tw/tw/cp-132-5130-7de92-1.htmlCVE 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.