CVE-2026-63117 FreeRDP CVE debrief

Who should care

System administrators and security teams responsible for RDP services and FreeRDP implementations should assess exposure and apply patches. This includes reviewing and verifying RDP client configurations and authentication mechanisms, as well as monitoring for potential denial of service attempts. Security teams should also track exceptions, retest remediated assets, and close the item only after evidence is documented.

Why it matters

CVE-2026-63117 is a denial of service vulnerability in FreeRDP that requires patching and verification of RDP client configurations.

• Potential denial of service for RDP services
• Verification of RDP client configurations and authentication mechanisms required
• Patching and updating FreeRDP to version 3.28.0 necessary

Technical summary

An authenticated RDP client can trigger a denial of service in FreeRDP prior to version 3.28.0 by advertising DVI ADPCM with specific parameters, causing a SIGFPE and terminating the rdpsnd channel process. The vulnerability affects FreeRDP implementations and requires patching and verification of RDP client configurations. The FreeRDP project has released a fix in version 3.28.0. Users should review and apply the patch, monitor for potential denial of service attempts, and verify RDP client configurations and authentication mechanisms.

Defensive priority

Medium

Recommended defensive actions

• Review and apply the patch from FreeRDP version 3.28.0
• Monitor for potential denial of service attempts
• Verify RDP client configurations and authentication mechanisms
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability. The FreeRDP project has released a fix in version 3.28.0. The vulnerability requires patching and verification of RDP client configurations. The CVE record was published on 2026-08-19T18:17:08.430Z and has not been modified since then. The FreeRDP project has addressed this issue with a patch. Users should verify their RDP client configurations and authentication mechanisms.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.