10 June 2026
Reference: CVE-2025-10263
1. What is being reported?
Researchers have identified a critical vulnerability in a range of Arm-based processor models. This flaw could allow unauthorised users to write data to protected areas of the system, potentially leading to remote code execution—meaning attackers could run harmful software remotely.
2. What this means in plain English
For small businesses, charities, and clubs, this means that if your devices use affected processors and are connected to the internet or untrusted networks, attackers might exploit this flaw to take control of your systems. This could lead to data loss, disruption, or theft of sensitive information.
3. Could this affect a small business?
If your organisation uses devices with the affected Arm processors—common in many Windows-based systems and servers—you could be at risk. However, if your devices do not use these processors or are isolated from external networks, the risk is lower. Confirm with your IT provider whether your hardware is affected.
4. What to do now
- Contact your IT provider immediately to check if your devices use the affected Arm processors.
- Ensure all your Windows and related software are fully updated with the latest security patches from Microsoft.
- Avoid opening unexpected emails or attachments, especially if they relate to Microsoft Office or Outlook.
- Review your network security settings to limit exposure to untrusted networks until patches are confirmed installed.
5. Ask your IT provider
Can you confirm whether our devices use the affected Arm processors and if all necessary security patches for CVE-2025-10263 have been applied?
6. Bottom line
Act quickly to confirm your devices are patched to prevent attackers from exploiting this critical processor vulnerability.
Information based on CISA KEV, NVD, and reputable security reporting including Rapid7.