CISA Issues Alert on Android 0-Day Use-After-Free Vulnerability Under Active Exploitation

The Cybersecurity and Infrastructure Security Agency (CISA) has issued a high-priority alert for a newly discovered zero-day vulnerability in the Android Runtime component.

This “use-after-free” flaw could allow attackers to escape the Chrome sandbox and elevate privileges on an affected device.

CISA warns that the vulnerability is under active exploitation and urges organizations and users to apply mitigations without delay.

On September 4, 2025, CISA added this vulnerability to its catalog and set a due date of September 25, 2025, for applying available mitigations.

At this time, it is not known whether the flaw has been used in ransomware attacks, but its potential impact warrants immediate action.

Product	Vulnerability	CVE Reference	Description
Android	Runtime Use-After-Free Vulnerability	CVE-2025-48543	Android Runtime contains a use-after-free vulnerability potentially allowing a Chrome sandbox escape leading to local privilege escalation.

A use-after-free vulnerability occurs when a program continues to use memory after it has been freed.

Attackers can exploit this flaw to execute arbitrary code, crash applications, or bypass security controls.

In this case, the vulnerability resides in the Android Runtime, a core component responsible for running apps on Android devices.

By exploiting it, an attacker may break out of the Chrome sandbox a security layer designed to isolate web content—and gain higher privileges on the device.

Android powers billions of smartphones and tablets worldwide. A successful exploit could give attackers full control over a device, access to personal data, or the ability to install malicious software.

Organizations relying on Android-based systems especially those managing sensitive data—face increased risk if mitigations are not applied promptly.

Mitigation Steps

1. Vendor Patches
   Check for updates from your device or chipset vendor.
2. Configuration Changes
   Follow any configuration hardening guidelines provided by the vendor.
3. BOD 22-01 Guidance
   If you use cloud services connected to Android backends, implement the guidance in Binding Operational Directive 22-01 for enhanced logging and monitoring.
4. Product Discontinuation
   If no mitigation exists, consider discontinuing use of the affected product until a fix is available.

The CVE-2025-48543 vulnerability in Android Runtime poses a serious risk of local privilege escalation.

CISA’s alert underscores the urgency for organizations and individuals to apply available mitigations by September 25, 2025.

Proactive patching and adherence to security directives are the best defenses against potential exploits. Failure to act may result in unauthorized access, data theft, or service disruption.

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