Security readout for executives and security teams
Plain-English summary
This vulnerability affects Bosch Smart Home Controller versions before 9.8.905. A restricted app could receive broader default app permissions after using the app permission update API. Business urgency is moderate because exploitation requires a successfully paired restricted app, and that pairing required user interaction.
Executive priority
Treat as a moderate-priority remediation for smart home or facility environments using Bosch SHC. It does not appear to be an emergency internet-wide issue from the provided sources, but affected devices should be updated and app permissions reviewed.
Technical view
CVE-2019-11893 is an incorrect privilege assignment issue in the Bosch Smart Home Controller app permission update API before 9.8.905. The flaw may allow a restricted app to obtain default app permissions. The CVSS 3.0 score is 5.5, with adjacent attack vector, low complexity, low privileges, and low confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to deployments using Bosch Smart Home Controller versions before 9.8.905 with paired apps using restricted permissions. The source bundle does not identify other Bosch products, cloud services, or internet-facing exposure.
Exploitation context
The source bundle does not show active exploitation, and the CVE is not listed as KEV. Exploitation requires an adversary to have already paired an app with restricted permissions, which required user interaction according to the CVE description.
Researcher notes
The key constraint is prerequisite access: a restricted app must already be paired, and pairing required user interaction. The provided data does not include exploit details, proof-of-concept availability, or Bosch mitigation text beyond the affected version boundary.
Mitigation direction
- Check Bosch PSIRT advisory guidance for the supported remediation path.
- Upgrade Bosch Smart Home Controller firmware to 9.8.905 or later where applicable.
- Review paired apps and remove any unknown or unnecessary restricted apps.
- Limit app pairing to trusted users and controlled maintenance windows.
Validation and detection
- Inventory Bosch Smart Home Controller devices and record firmware versions.
- Confirm whether any controller runs a version before 9.8.905.
- Review paired app lists for unexpected or stale restricted apps.
- Check operational logs or admin records for unusual app permission changes.
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
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ATT&CK lookup starting points
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Open ATT&CK lookupCVE-2019-11893 mapping review
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Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.5 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
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:3.0/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L2.13.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
5.5MediumVector: CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://psirt.bosch.com/Advisory/BOSCH-SA-662084.htmlCVE 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.
Incorrect Privilege Assignment
Incorrect Privilege Assignment represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.