---
id: CVE-2026-111880
title: FreeRDP 2.0.0 before 3.32.0 Heap Out-of-Bounds Write via NTLM MIC Offset
summary: >-
  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 s…
severity: high
cvss: 7.4
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-787
vendor: FreeRDP
product: FreeRDP
affected:
  - FreeRDP >= 2.0.0 < 3.32.0
published: '2026-10-17'
updated: '2026-10-17'
sourceUpdated: '2026-10-17T18:46:08.393Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111880'
references:
  - url: 'https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-cmgx-558f-vh67'
    label: GitHub Security Advisory (GHSA-cmgx-558f-vh67)
  - url: >-
      https://www.vulncheck.com/advisories/freerdp-2.0.0-before-3.32.0-heap-out-of-bounds-write-via-ntlm-mic-offset
    label: >-
      VulnCheck Advisory: FreeRDP 2.0.0 before 3.32.0 Heap Out-of-Bounds Write
      via NTLM MIC Offset
tags:
  - cve.org
ingestedAt: '2026-10-17T19:08:56.993Z'
---

## Overview

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.

## Affected

- `FreeRDP >= 2.0.0 < 3.32.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.