Security readout for executives and security teams
Plain-English summary
CVE-2021-0520 is an Android local privilege escalation issue in Android 10 and 11. A race condition could cause use-after-free behavior in MemoryFileSystem.cpp-related code. The sources do not show remote attack capability or confirmed exploitation, but unpatched devices may allow a local attacker to gain higher privileges without user interaction.
Executive priority
Treat this as a mobile fleet hygiene issue with privilege escalation impact. It should not displace actively exploited critical risks, but Android 10 and 11 devices missing mid-2021 security patches should be remediated or removed from trusted access paths.
Technical view
Android describes a possible use-after-free across several MemoryFileSystem.cpp functions and related files, caused by a race condition. The impact is local escalation of privilege with no additional execution privileges and no user interaction. No CVSS vector, CWE, detailed affected build list, or exploit evidence is provided in the supplied sources.
Likely exposure
Exposure is likely limited to Android 10 and Android 11 devices that did not receive vendor security updates addressing the June 2021 Android bulletin. Risk is highest for unmanaged, unsupported, or delayed-patch mobile fleets.
Exploitation context
The source bundle supports local privilege escalation only. It does not support remote exploitation, public exploit availability, or active exploitation. CISA KEV status is false in the provided data.
Researcher notes
Evidence is sparse. Android ID A-176237595 links the issue to MemoryFileSystem.cpp-related race conditions and use-after-free behavior. The supplied data does not include commit diffs, affected components beyond Android 10 and 11, CVSS, CWE mapping, or proof-of-concept details.
Mitigation direction
- Check OEM guidance for Android security patch availability.
- Prioritize updates for Android 10 and 11 devices.
- Verify devices include June 2021 Android security fixes or later.
- Retire or isolate unsupported devices that cannot receive fixes.
Validation and detection
- Inventory Android 10 and 11 devices across managed fleets.
- Record each device security patch level and OEM build.
- Compare patch levels against Android June 2021 bulletin guidance.
- Flag unsupported or stale devices for remediation tracking.
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-2021-0520 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/2021-06-01CVE 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.