Security readout for executives and security teams
Plain-English summary
This issue affects ABB and Busch-Jaeger free@home System Access Point devices. An attacker could bypass the firmware upload integrity check, meaning a device may accept firmware that should have been rejected. The main business concern is disruption of building or home automation services rather than direct data theft.
Executive priority
Treat as a moderate operational technology risk. Prioritize sites where free@home controls business-critical building functions or where local maintenance access is shared, weakly governed, or outsourced.
Technical view
CVE-2021-22276 is a firmware integrity-check bypass in specified System Access Point models. The CVSS 3.1 vector is local, low complexity, no privileges, user interaction required, unchanged scope, no confidentiality impact, low integrity impact, and high availability impact.
Likely exposure
Exposure is limited to environments running the listed ABB or Busch-Jaeger System Access Point product numbers. Risk is higher where local access, maintenance systems, or firmware update workflows are weakly controlled.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation evidence. The CVSS vector indicates exploitation requires local access and user interaction, but could meaningfully affect availability if abused.
Researcher notes
The provided record names an integrity-check bypass but does not include exploit details or a specific fixed version. The listed CWE is CWE-200, though the described impact centers on firmware integrity and availability.
Mitigation direction
- Review ABB guidance for affected models and vendor-prescribed updates or actions.
- Inventory listed ABB and Busch-Jaeger System Access Point devices.
- Restrict local access to controller update interfaces and maintenance workstations.
- Allow firmware updates only through trusted vendor channels and change control.
- Monitor controllers for unexpected firmware changes, reboots, or availability loss.
Validation and detection
- Confirm whether deployed product numbers match the affected ABB or Busch-Jaeger list.
- Check firmware maintenance records for unexpected or unapproved update activity.
- Verify firmware update procedures require trusted sources and approval.
- Confirm local access to affected controllers is physically and logically restricted.
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-200: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. 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-2021-22276 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:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/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:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H1.84.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://search.abb.com/library/Download.aspx?DocumentID=9AKK107992A6475&LanguageCode=en&DocumentPartId=&Action=LaunchCVE 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.
Exposure of Sensitive Information to an Unauthorized Actor
Exposure of Sensitive Information to an Unauthorized Actor represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.