CVE-2022-4283

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2022-12-14. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

A vulnerability was found in X.Org. This security flaw occurs because the XkbCopyNames function left a dangling pointer to freed memory, resulting in out-of-bounds memory access on subsequent XkbGetKbdByName requests.. This issue can lead to local privileges elevation on systems where the X server is running privileged and remote code execution for ssh X forwarding sessions.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
58%
KEV
Not listed

Published

December 14, 2022

Last Modified

August 29, 2025

References (14)

Vendor Advisories for CVE-2022-4283(5)

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

Patch Availability(11)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuxdmx-tools (2:1.19.6-1ubuntu4.13) @ bionic2026-05-25ubuntu
ubuntuxserver-xephyr-hwe-16.04 (2:1.19.6-1ubuntu4.1~16.04.6+esm4) @ xenial2026-05-25ubuntu
redhattigervnc-0:1.1.0-25.el6_10.132025-08-04redhat
redhattigervnc-0:1.12.0-15.el8_82023-05-16redhat
redhatxorg-x11-server-Xwayland-0:21.1.3-10.el82023-05-16redhat
redhatxorg-x11-server-0:1.20.11-15.el82023-05-16redhat
redhattigervnc-0:1.12.0-13.el9_22023-05-09redhat
redhatxorg-x11-server-0:1.20.11-17.el92023-05-09redhat
redhatxorg-x11-server-Xwayland-0:21.1.3-7.el92023-05-09redhat
redhattigervnc-0:1.8.0-23.el7_92023-01-09redhat
redhatxorg-x11-server-0:1.20.4-21.el7_92023-01-09redhat

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

(6)

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 12× in last 7d / 47× 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 111 total refreshes for this CVE.

  1. 2026-07-26 14:52 UTCEPSS rescore
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  7. 2026-07-23 02:14 UTCEG score recompute
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  20. 2026-06-28 11:19 UTCOSV refresh
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  49. 2026-06-11 13:58 UTCEPSS rescore
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  51. 2026-06-10 21:47 UTCOSV refresh
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Frequently asked(5)

What is CVE-2022-4283?
CVE-2022-4283 is a high vulnerability published on December 14, 2022. A vulnerability was found in X.Org. This security flaw occurs because the XkbCopyNames function left a dangling pointer to freed memory, resulting in out-of-bounds memory access on subsequent XkbGetKbdByName requests.. This issue can lead to local privileges elevation on systems where the X server…
When was CVE-2022-4283 disclosed?
CVE-2022-4283 was first published in the National Vulnerability Database on December 14, 2022, with the most recent update on August 29, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2022-4283 actively exploited?
CVE-2022-4283 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 42.2% of all scored CVEs.
What is the CVSS score of CVE-2022-4283?
CVE-2022-4283 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2022-4283?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2022-4283, 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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