CVE-2026-111880 FreeRDP CVE debrief

Who should care

Defenders responsible for remote desktop connections, especially those using FreeRDP, should assess exposure and prioritize verification and updates. Operators of affected platforms and vulnerability management teams should review compensating controls for exposed systems while remediation is scheduled and verified. Security teams should monitor for suspicious authentication attempts and track exceptions, retest remediated assets, and close the item only

Why it matters

CVE-2026-111880 is a high-severity vulnerability in FreeRDP that requires attention from defenders responsible for remote desktop connections. The vulnerability allows unauthenticated attackers to exploit the server hash-callback NTLM path, potentially leading to system compromise. Defenders should prioritize verification and updates to prevent exploitation.

• Potential for unauthenticated attackers to exploit the vulnerability
• Possible impact on remote desktop connections and systems relying on FreeRDP
• Need for verification and updates to prevent exploitation

Technical summary

The vulnerability is caused by a heap out-of-bounds write in the server hash-callback NTLM path of FreeRDP. This occurs when the MIC offset is not validated properly, allowing unauthenticated attackers to send a crafted AUTHENTICATE_MESSAGE and write 16 zero bytes beyond the allocation. Affected product deployments using FreeRDP versions from 2.0.0 before 3.32.0 should prioritize verification and updates to prevent exploitation. Defenders should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Defensive priority

Defenders should prioritize verifying and updating FreeRDP to version 3.32.0 or later, especially for systems that rely on remote desktop connections.

Recommended defensive actions

• Verify and update FreeRDP to version 3.32.0 or later
• Review and restrict remote desktop connections to trusted sources
• Monitor for suspicious authentication attempts
• 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 vulnerability details are based on the CVE Program record and the NVD vulnerability detail page. Additional information is available from source references, including GitHub and Vulncheck advisories.

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.