---
id: CVE-2024-21886
title: 'Xorg-x11-server: heap buffer overflow in disabledevice'
summary: >-
  A heap buffer overflow flaw was found in the DisableDevice function in the
  X.Org server. This issue may lead to an application crash or, in some
  circumstances, remote code execution in SSH X11 forwarding environments.
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-122
vendor: Red Hat
product: xorg-server
affected:
  - xorg-server 1.21.1.7
  - tigervnc (all versions)
  - xorg-x11-server (all versions)
  - tigervnc (all versions)
  - tigervnc (all versions)
  - xorg-x11-server (all versions)
  - xorg-x11-server-Xwayland (all versions)
  - tigervnc (all versions)
  - tigervnc (all versions)
  - tigervnc (all versions)
  - tigervnc (all versions)
  - tigervnc (all versions)
  - tigervnc (all versions)
  - tigervnc (all versions)
  - tigervnc (all versions)
  - tigervnc (all versions)
  - xorg-x11-server (all versions)
  - xorg-x11-server-Xwayland (all versions)
  - tigervnc (all versions)
  - tigervnc (all versions)
  - xorg-x11-server
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2024-04-23T21:47:31.702467Z'
published: '2024-02-28'
updated: '2026-11-04'
sourceUpdated: '2026-11-04T21:10:05.254Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2024-21886'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2024:0320'
    label: 'RHSA-2024:0320'
  - url: 'https://access.redhat.com/errata/RHSA-2024:0557'
    label: 'RHSA-2024:0557'
  - url: 'https://access.redhat.com/errata/RHSA-2024:0558'
    label: 'RHSA-2024:0558'
  - url: 'https://access.redhat.com/errata/RHSA-2024:0597'
    label: 'RHSA-2024:0597'
  - url: 'https://access.redhat.com/errata/RHSA-2024:0607'
    label: 'RHSA-2024:0607'
  - url: 'https://access.redhat.com/errata/RHSA-2024:0614'
    label: 'RHSA-2024:0614'
  - url: 'https://access.redhat.com/errata/RHSA-2024:0617'
    label: 'RHSA-2024:0617'
  - url: 'https://access.redhat.com/errata/RHSA-2024:0621'
    label: 'RHSA-2024:0621'
  - url: 'https://access.redhat.com/errata/RHSA-2024:0626'
    label: 'RHSA-2024:0626'
  - url: 'https://access.redhat.com/errata/RHSA-2024:0629'
    label: 'RHSA-2024:0629'
  - url: 'https://access.redhat.com/errata/RHSA-2024:2169'
    label: 'RHSA-2024:2169'
  - url: 'https://access.redhat.com/errata/RHSA-2024:2170'
    label: 'RHSA-2024:2170'
  - url: 'https://access.redhat.com/errata/RHSA-2024:2995'
    label: 'RHSA-2024:2995'
  - url: 'https://access.redhat.com/errata/RHSA-2024:2996'
    label: 'RHSA-2024:2996'
  - url: 'https://access.redhat.com/errata/RHSA-2025:12751'
    label: 'RHSA-2025:12751'
  - url: 'https://access.redhat.com/security/cve/CVE-2024-21886'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2256542'
    label: RHBZ#2256542
tags:
  - cve.org
epss: 0.0142
epssPercentile: 0.7291
ingestedAt: '2026-11-05T21:36:00.600Z'
---

## Overview

A heap buffer overflow flaw was found in the DisableDevice function in the X.Org server. This issue may lead to an application crash or, in some circumstances, remote code execution in SSH X11 forwarding environments.

## Affected

- `xorg-server 1.21.1.7`
- `tigervnc (all versions)`
- `xorg-x11-server (all versions)`
- `tigervnc (all versions)`
- `tigervnc (all versions)`
- `xorg-x11-server (all versions)`
- `xorg-x11-server-Xwayland (all versions)`
- `tigervnc (all versions)`
- `tigervnc (all versions)`
- `tigervnc (all versions)`
- `tigervnc (all versions)`
- `tigervnc (all versions)`
- `tigervnc (all versions)`
- `tigervnc (all versions)`
- `tigervnc (all versions)`
- `tigervnc (all versions)`
- `xorg-x11-server (all versions)`
- `xorg-x11-server-Xwayland (all versions)`
- `tigervnc (all versions)`
- `tigervnc (all versions)`
- `xorg-x11-server`

## Remediation

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

### Workarounds

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.