Security readout for executives and security teams
Plain-English summary
CVE-2021-0584 is an Android flaw that can let a local, already-running app or user read information it should not. It does not require user interaction, but it does require local access and does not provide code execution or system control by itself.
Executive priority
Handle through normal mobile patch management, with higher urgency for devices accessing sensitive data. The issue can disclose information locally but is not documented here as remotely exploitable or actively exploited.
Technical view
Android Parcel.cpp verifyBufferObject has improper input validation causing a possible out-of-bounds read. The CVSS 3.1 vector is AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N, indicating local low-privilege exploitation with high confidentiality impact only.
Likely exposure
Exposure is limited to Android 8.1, 9, 10, and 11 devices that did not receive the relevant Android/OEM security update from the August 2021 bulletin stream.
Exploitation context
The provided sources do not show known active exploitation or CISA KEV listing. Exploitation is local, requires low privileges, and needs no user interaction. Treat it as a confidentiality risk on unpatched Android endpoints.
Researcher notes
Evidence identifies CWE-125 out-of-bounds read in verifyBufferObject of Parcel.cpp, Android ID A-179289794. The sources do not provide exploit details, proof-of-concept status, or a standalone mitigation beyond Android/OEM patch guidance.
Mitigation direction
- Apply Android/OEM security updates covering the August 2021 Android bulletin.
- Prioritize unsupported or unmanaged Android 8.1 through 11 devices for review.
- Replace or isolate devices that cannot receive vendor security updates.
- Check vendor guidance for device-specific patch availability and patch levels.
Validation and detection
- Inventory Android devices and record OS version and security patch level.
- Confirm affected Android 8.1, 9, 10, and 11 devices received applicable OEM updates.
- Use MDM or vulnerability tooling to flag devices below the relevant patch level.
- Review exception lists for legacy devices that cannot be updated.
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-125: 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-2021-0584 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
- 5.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
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:N/A:N1.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.5MediumVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://source.android.com/security/bulletin/2021-08-01CVE 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.
Out-of-bounds Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.