CVE-2024-21886

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2024-02-28. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.8Exploit: NoneExposed: 0

A fix is available — apply it.

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)
EG Risk
—
EPSS
70.0%
KEV
Not listed

Published

February 28, 2024

Last Modified

April 15, 2026

References (38)

Vendor Advisories for CVE-2024-21886(6)

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

Patch Availability(18)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuxwayland (2:23.2.0-1ubuntu0.4) @ mantic2026-05-22ubuntu
ubuntuxwayland (2:1.19.6-1ubuntu4.15+esm4) @ bionic2026-05-22ubuntu
ubuntuxvfb (2:1.15.1-0ubuntu2.11+esm9) @ trusty2026-05-22ubuntu
redhattigervnc-0:1.1.0-25.el6_10.132025-08-04redhat
redhatxorg-x11-server-0:1.20.11-22.el82024-05-22redhat
redhatxorg-x11-server-Xwayland-0:21.1.3-15.el82024-05-22redhat
redhatxorg-x11-server-0:1.20.11-24.el92024-04-30redhat
redhatxorg-x11-server-Xwayland-0:22.1.9-5.el92024-04-30redhat
redhattigervnc-0:1.8.0-31.el7_92024-01-31redhat
redhattigervnc-0:1.9.0-15.el8_2.92024-01-31redhat
redhattigervnc-0:1.12.0-14.el9_2.52024-01-31redhat
redhattigervnc-0:1.13.1-3.el9_3.62024-01-30redhat
redhattigervnc-0:1.13.1-2.el8_9.72024-01-30redhat
redhattigervnc-0:1.11.0-22.el9_0.82024-01-30redhat
redhattigervnc-0:1.12.0-6.el8_6.92024-01-30redhat
redhattigervnc-0:1.12.0-15.el8_8.72024-01-30redhat
redhattigervnc-0:1.11.0-8.el8_4.82024-01-30redhat
redhatxorg-x11-server-0:1.20.4-27.el7_92024-01-22redhat

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.

Additional Vendor Advisories

(13)

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 11× in last 7d / 46× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 130 total refreshes for this CVE.

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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 70.0% 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.

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