CVE-2026-111373 FreeRDP CVE debrief

Who should care

Defenders responsible for systems using FreeRDP should assess exposure and prioritize updates to version 3.32.0 or later. Monitoring for unusual websocket activity can help detect potential exploitation attempts.

Why it matters

CVE-2026-111373 is a medium-severity vulnerability in FreeRDP that can be exploited for denial of service attacks. Defenders should prioritize verifying client configurations and updating to version 3.32.0 or later.

• Denial of service attacks can be launched against vulnerable clients.
• Client crashes can occur due to NULL pointer dereferences.
• Defenders should verify client configurations and update to version 3.32.0 or later.
• Monitoring for unusual websocket activity is recommended.

Technical summary

The vulnerability exists in the websocket transport of FreeRDP before version 3.32.0. A malicious gateway can send zero-length pings to clients, triggering a NULL pointer dereference and causing the client process to terminate. This results in a denial of service condition. The vulnerability allows a malicious gateway to exploit the NULL pointer dereference vulnerability in the websocket transport, causing clients to crash and resulting in denial of service. Defenders should prioritize verifying client configurations, updating to version 3.32.0 or later, and monitoring for unusual websocket activity.

Defensive priority

Defenders should prioritize verifying client configurations, updating to version 3.32.0 or later, and monitoring for unusual websocket activity.

Recommended defensive actions

• Verify client configurations to ensure they are using version 3.32.0 or later of FreeRDP.
• Monitor websocket traffic for unusual patterns that could indicate exploitation attempts.
• Implement additional security measures to detect and prevent denial of service attacks.
• 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, including its description and CVSS score. However, additional information on affected systems and potential mitigations is limited. The vulnerability is confirmed to exist in FreeRDP before version 3.32.0, and defenders should verify client configurations and update to version 3.32.0 or later. The CVE Program record and NVD detail page provide official information on the vulnerability. Additional sources may provide further context on affected systems and potential mit

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.