Security readout for executives and security teams
Plain-English summary
This Android flaw could let a local app gain the privileges of the Android shell user when wireless debugging is enabled. That is a meaningful device-control risk, but the provided sources require user interaction and do not show active exploitation.
Executive priority
Treat this as a targeted mobile hardening issue, not an internet-wide emergency. Prioritize affected managed Android fleets, especially developer or test devices where wireless debugging may be enabled.
Technical view
CVE-2021-39794 is a missing permission check in broadcastPortInfo of Android's AdbService.java. On Android 11, 12, and 12L, it can allow local escalation of privilege by letting an app run code as the shell user when wireless debugging is enabled.
Likely exposure
Exposure appears limited to Android 11, Android 12, and Android 12L devices where wireless debugging is enabled. Devices without wireless debugging enabled are less likely to be exposed based on the provided description.
Exploitation context
The source bundle says exploitation needs local app context, wireless debugging enabled, and user interaction. It does not cite KEV listing, public exploitation, exploit availability, or remote unauthenticated attack paths.
Researcher notes
Evidence is limited to the CVE description and Android bulletin reference. No CVSS, CWE, exploit status, or detailed patch mechanics are provided in the bundle, so validation should stay focused on affected Android versions and wireless debugging state.
Mitigation direction
- Check Android and OEM guidance for CVE-2021-39794 updates.
- Apply relevant Android security updates from the vendor.
- Disable wireless debugging when not explicitly needed.
- Restrict installation of untrusted apps on affected devices.
- Prioritize managed Android devices running 11, 12, or 12L.
Validation and detection
- Inventory Android 11, 12, and 12L devices.
- Check whether wireless debugging is enabled on managed devices.
- Verify vendor patch status against Android April 2022 bulletin guidance.
- Review EMM or MDM controls for wireless debugging restrictions.
- Look for policy exceptions allowing untrusted app installation.
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.
CVE-2021-39794 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://source.android.com/security/bulletin/2022-04-01CVE 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.