> For the complete documentation index, see [llms.txt](https://cortex-docs.paloaltonetworks.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cortex-docs.paloaltonetworks.com/cortex-xdr-3.x-rn/cortex-xdr-release-information/features-introduced-in-2024-xdr/february-2024/release-highlights.md).

# Release Highlights

The Cortex XDR 3.9 and Agent 8.3 releases include the following highlights:

| Feature                        | Description                                                                                                                                                                                                              |
| ------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| On-write protection module     | Cortex XDR has expanded its machine learning (ML) based security capabilities to include on-write protection for Windows that includes Wildfire and local analysis.                                                      |
| UEFI protection module         | Cortex XDR has expanded its malware protection capabilities by adding the UEFI protection module, which reinforces and provides coverage against pre-boot attacks.                                                       |
| Limit access to Cortex XDR API | Limit Cortex XDR API access to a specific IP address or IP range by adding them to an Allow list.This ensures better data security and control while facilitating integration with third-party systems and applications. |


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