Samsung zero-day patch: what to do first
Samsung released an emergency security update to fix a zero-day bug that attackers were using in the wild. Install the September 2025 security update now from Settings → Software update to protect your phone.
Why the Samsung zero-day patch matters
The patched problem (CVE-2025-21043) could let bad apps run code on a phone. Samsung gave the fix a high severity score and pushed updates to many Galaxy phones this month. Applying the patch stops attackers from using the flaw.
Quick steps to update
Open Settings → Software update → Download and install. If you manage many phones, push the update across your devices soon. Security teams should check Samsung’s bulletin for details.
Frequently Asked Questions
What is the Samsung zero-day patch for?
The Samsung zero-day patch fixes CVE-2025-21043, a high-severity vulnerability that could allow remote code execution.
How do I get the Samsung zero-day patch?
Go to Settings → Software update on your Galaxy phone and install the September 2025 security update from Samsung.
Should I be worried about my data?
If you install the update now, your risk is greatly reduced; older unpatched phones could be vulnerable until updated.
Author note: I checked The Hacker News, SecurityWeek and GadgetHacks for technical details and patch guidance. Install the update as soon as you can.