Security readout for executives and security teams
Plain-English summary
CVE-2021-0539 is an Android 11 permission-check flaw in the MMS service. A local actor could archive a message conversation without the user approving it. The public record frames this as local privilege escalation, but does not provide a CVSS score or confirmed exploitation evidence.
Executive priority
Treat this as a routine but necessary mobile patching item. Business urgency rises for fleets with many Android 11 devices or delayed OEM updates. There is no source-backed evidence of active exploitation, but the flaw affects user consent and privilege boundaries.
Technical view
The issue is in archiveStoredConversation in MmsService.java. A missing permission check could allow conversation archiving without user consent. The CVE states no additional execution privileges or user interaction are needed. Available sources identify Android 11 and reference the June 2021 Pixel security bulletin.
Likely exposure
Exposure is limited to Android 11 devices that have not received the relevant June 2021 Android/Pixel or OEM security update. Non-Android platforms and other Android versions are not identified as affected in the source bundle.
Exploitation context
The available evidence describes local escalation of privilege, not remote exploitation. CISA KEV status is false in the bundle, and no cited source states active exploitation. The public description does not include exploit mechanics, preconditions beyond local context, or observed attacks.
Researcher notes
Public detail is sparse: no CVSS, CWE, exploit status, or detailed patch note is provided in the bundle. Analysis should stay tied to Android 11, MmsService.java, missing permission check, and the June 2021 Pixel bulletin reference.
Mitigation direction
- Apply the relevant June 2021 Android/Pixel or OEM security update.
- Prioritize Android 11 devices with messaging access or sensitive users.
- Check OEM guidance for device-specific patch availability.
- Restrict untrusted app installation where patching is delayed.
- Use MDM reporting to track unpatched Android 11 assets.
Validation and detection
- Inventory Android 11 devices across managed fleets.
- Verify security patch level includes the June 2021 vendor fix.
- Confirm OEM advisories map CVE-2021-0539 to installed builds.
- Review MDM compliance for devices missing the relevant update.
- Monitor vendor bulletins for any updated severity or mitigation detail.
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-2021-0539 mapping review
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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/pixel/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.