Security readout for executives and security teams
Plain-English summary
CVE-2018-9339 is a high-severity Android local privilege escalation issue. A low-privileged local attacker could abuse type confusion in Android Parcel typed-array list handling to gain higher privileges. No user interaction is required, but the attack is local rather than remote.
Executive priority
Treat this as a legacy Android risk requiring asset visibility and patch confirmation. It is high impact if an attacker already has local foothold, but the supplied evidence does not indicate internet-scale or active exploitation.
Technical view
The issue affects Google Android 8 and 8.1 in Parcel.java writeTypedArrayList and readTypedArrayList. The CVE describes type confusion, mapped to CWE-704, with CVSS 3.1 score 7.8: local access, low complexity, low privileges, no user interaction, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to Android 8 and 8.1 devices that have not received the relevant vendor security update. Organizations should pay attention to unmanaged, legacy, embedded, kiosk, or BYOD Android devices still running these versions.
Exploitation context
The provided sources do not show active exploitation, and the CVE is not listed as KEV in the supplied bundle. Exploitation requires local access with low privileges and does not require user interaction.
Researcher notes
Do not assume broader Android versions are affected beyond the supplied data. Validation should focus on Parcel.java typed-array list handling exposure in Android 8 and 8.1 and vendor bulletin status, without inferring exploit availability.
Mitigation direction
- Check vendor guidance in the Android Security Bulletin dated 2018-06-01.
- Prioritize updates for Android 8 and 8.1 devices still in service.
- Replace or isolate devices that cannot receive vendor security updates.
- Restrict use of unsupported Android versions in enterprise access policies.
Validation and detection
- Inventory Android devices and identify versions 8 and 8.1.
- Confirm each affected device security patch level against vendor guidance.
- Review MDM data for unsupported or unmanaged Android endpoints.
- Document any devices that cannot be updated and require compensating controls.
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-704: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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-2018-9339 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
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://source.android.com/security/bulletin/2018-06-01CVE reference
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 Type Conversion or Cast
Incorrect Type Conversion or Cast represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.