CVE-2026-111880

7.4High

Published 17 Oct 2026 · NVD status: Received · AI triage by gemini-3.8-flash

7.4High

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: None
Impact: High impact on integrity, availability
Weakness: CWE-787

Impact

Remote unauthenticated attackers can corrupt heap memory and crash FreeRDP servers or potentially alter execution state. They only need network access to send a malformed NTLM authentication message.

Root cause

The server hash-callback NTLM parsing logic fails to validate the MIC offset, allowing a negative offset to overwrite 16 zero bytes outside the allocated heap buffer.

Affected systems

FreeRDP 2.0.0 before 3.32.0

CVSS v3.1 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H

Fix & remediation

Upgrade to FreeRDP 3.32.0 or later. If upgrading immediately is not possible, restrict network access to the FreeRDP server port via firewall to trusted sources.

shell

$ sudo apt-get update && sudo apt-get install --only-upgrade freerdp2-x11 freerdp2-shadow-x11 libfreerdp-server2-2

AI-suggested. Run it in staging first and check it against the vendor advisory. Why?

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NVD description

FreeRDP versions from 2.0.0 before 3.32.0 contain a heap out-of-bounds write in the server hash-callback NTLM path that fails to validate the MIC offset. Unauthenticated attackers can send a crafted AUTHENTICATE_MESSAGE with a backward session-key offset and MIC offset to write 16 zero bytes beyond the allocation.

References

Source: nvd.nist.gov/vuln/detail/CVE-2026-111880