---
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
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-19T15:35:23.400734Z'
published: '2026-10-17'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T16:40:26.597Z'
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
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-111880.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-111880'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2554625'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-111880'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-111880'
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00321
epssPercentile: 0.24907
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.

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · updated 2026-10-19 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-111880.json)