CVE-2024-21886

HIGHNVD 7.87.8—

7.8

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.

CVSS v3: 7.8
EG Score: 7.8(medium)
EPSS: 47.1%
KEV: Not listed

Published

February 28, 2024

Last Modified

April 15, 2026

References (38)

secalert@redhathttps://access.redhat.com/errata/RHSA-2024:0320
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:0557
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:0558
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:0597
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:0607
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:0614
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:0617
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:0621
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:0626
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:0629
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:2169
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:2170
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:2995
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:2996
secalert@redhathttps://access.redhat.com/errata/RHSA-2025:12751

Vendor Advisories for CVE-2024-21886(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

CVE-2024-21886
Microsoft Security Response Center (MSRC)
CVE-2024-21886

Patch Availability(18)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	xwayland (2:23.2.0-1ubuntu0.4) @ mantic	2026-05-22	ubuntu
ubuntu	xwayland (2:1.19.6-1ubuntu4.15+esm4) @ bionic	2026-05-22	ubuntu
ubuntu	xvfb (2:1.15.1-0ubuntu2.11+esm9) @ trusty	2026-05-22	ubuntu
redhat	tigervnc-0:1.1.0-25.el6_10.13	2025-08-04	redhat
redhat	xorg-x11-server-0:1.20.11-22.el8	2024-05-22	redhat
redhat	xorg-x11-server-Xwayland-0:21.1.3-15.el8	2024-05-22	redhat
redhat	xorg-x11-server-0:1.20.11-24.el9	2024-04-30	redhat
redhat	xorg-x11-server-Xwayland-0:22.1.9-5.el9	2024-04-30	redhat
redhat	tigervnc-0:1.8.0-31.el7_9	2024-01-31	redhat
redhat	tigervnc-0:1.9.0-15.el8_2.9	2024-01-31	redhat
redhat	tigervnc-0:1.12.0-14.el9_2.5	2024-01-31	redhat
redhat	tigervnc-0:1.13.1-3.el9_3.6	2024-01-30	redhat
redhat	tigervnc-0:1.13.1-2.el8_9.7	2024-01-30	redhat
redhat	tigervnc-0:1.11.0-22.el9_0.8	2024-01-30	redhat
redhat	tigervnc-0:1.12.0-6.el8_6.9	2024-01-30	redhat
redhat	tigervnc-0:1.12.0-15.el8_8.7	2024-01-30	redhat
redhat	tigervnc-0:1.11.0-8.el8_4.8	2024-01-30	redhat
redhat	xorg-x11-server-0:1.20.4-27.el7_9	2024-01-22	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-122Heap-based Buffer Overflow

Additional Vendor Advisories

(18)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 14× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-04 13:11 UTCepss_batch
2026-06-04 13:11 UTCepss_batch
2026-06-04 13:11 UTCepss_batch
2026-06-02 20:12 UTCepss_batch
2026-06-02 20:12 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:43 UTCepss_batch
2026-05-29 13:43 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-26 13:43 UTCepss_batch

Frequently asked(5)

What is CVE-2024-21886?

CVE-2024-21886 is a high vulnerability published on February 28, 2024. 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.

When was CVE-2024-21886 disclosed?

CVE-2024-21886 was first published in the National Vulnerability Database on February 28, 2024, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2024-21886 actively exploited?

CVE-2024-21886 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 47.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2024-21886?

CVE-2024-21886 has a CVSS v3 base score of 7.8 (NVD).

How do I remediate CVE-2024-21886?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-21886, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2024-21886

Published

Last Modified

References (38)

Vendor Advisories for CVE-2024-21886(1)

Patch Availability(18)

Weakness Classification(1)

Additional Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2024-21886?

Same vendor

Same CWE

CVE-2024-21886

📅 Published

🔄 Last Modified

🔗 References (38)

📣 Vendor Advisories for CVE-2024-21886(1)

Patch Availability(18)

Weakness Classification(1)

Additional Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2024-21886?

🔗 Related CVEs(same vendor + same CWE)

Same vendor

Same CWE

Published

Last Modified

References (38)

Vendor Advisories for CVE-2024-21886(1)

Frequently asked(5)

Related CVEs(same vendor + same CWE)