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Findings

CVE-2020-0099

In addWindow of WindowManagerService.java, there is a possible window overlay attack due to an insecure default value.

Published Dec 1, 2020 · corrected/updated Oct 16, 2026 · evidence confidence medium

In addWindow of WindowManagerService.java, there is a possible window overlay attack due to an insecure default value. This could lead to local escalation of privilege via tapjacking with no additional execution privileges needed. User interaction is needed for exploitation.

Grounded briefings

Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.

Executive

CVE-2020-0099 is a unknown public vulnerability record for this product. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.

System administrator

Identify whether this product is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: platform/frameworks/base (10:0 → 10:2020-12-01); platform/frameworks/base (8.0:0 → 8.0:2020-12-01); platform/frameworks/base (8.1:0 → 8.1:2020-12-01); platform/frameworks/base (9:0 → 9:2020-12-01). Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.

Security analyst

Signals on file: EPSS 0.5%. It is not currently listed in the CISA Known Exploited catalog. Sources contributing to this record: epss, osv. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.

Exploitation and remediation

  • Exploitation evidence

    Not listed as known exploited in CISA KEV. Not in the CISA KEV catalog.

  • Patch and remediation

    No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.

  • Safe detection guidance

    Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Dec 1, 2020 · OSV.dev

    Detected

    In addWindow of WindowManagerService.java, there is a possible window overlay attack due to an insecure default value. This could lead to local escalation of privilege via tapjacking with no additional execution privileges needed. User interaction is needed for exploitation.

  2. Oct 16, 2026 · OSV.dev

    Fix available

    platform/frameworks/base fixed in 8.0:2020-12-01; platform/frameworks/base fixed in 8.1:2020-12-01; platform/frameworks/base fixed in 9:2020-12-01; platform/frameworks/base fixed in 10:2020-12-01

  3. Oct 16, 2026 · OSV.dev

    Fix available

    platform/frameworks/base fixed in 8.0:2020-12-01

  4. Oct 16, 2026 · OSV.dev

    Fix available

    platform/frameworks/base fixed in 8.1:2020-12-01

  5. Oct 16, 2026 · OSV.dev

    Fix available

    platform/frameworks/base fixed in 9:2020-12-01

  6. Oct 16, 2026 · OSV.dev

    Fix available

    platform/frameworks/base fixed in 10:2020-12-01

  7. Oct 16, 2026 · OSV.dev

    Updated

    In addWindow of WindowManagerService.java, there is a possible window overlay attack due to an insecure default value. This could lead to local escalation of privilege via tapjacking with no additional execution privileges needed. User interaction is needed for exploitation.

Affected

  • Android platform/frameworks/base10:0 → 10:2020-12-01
  • Android platform/frameworks/base8.0:0 → 8.0:2020-12-01
  • Android platform/frameworks/base8.1:0 → 8.1:2020-12-01
  • Android platform/frameworks/base9:0 → 9:2020-12-01

Sources

References