CVE-2023-6816

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 2.1%, top 20% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

A flaw was found in X.Org server. Both DeviceFocusEvent and the XIQueryPointer reply contain a bit for each logical button currently down. Buttons can be arbitrarily mapped to any value up to 255, but the X.Org Server was only allocating space for the device's particular number of buttons, leading to a heap overflow if a bigger value was used.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
—
EPSS
79.8%
KEV
Not listed

Published

January 18, 2024

Last Modified

March 19, 2026

Advisory Details (10)

Auto-updated Jul 8, 2026
Patch available. Sources: redhat.
redhat Patch Available

Affected: Red Hat Enterprise Linux 7.

https://access.redhat.com/errata/RHSA-2024:0629
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.2 Extended Update Support.

https://access.redhat.com/errata/RHSA-2024:0626
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.6 Extended Update Support.

https://access.redhat.com/errata/RHSA-2024:0621
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.2 Advanced Update Support, Red Hat Enterprise Linux 8.2 Telecommunications Update Service, and Red

https://access.redhat.com/errata/RHSA-2024:0617
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.0 Extended Update Support.

https://access.redhat.com/errata/RHSA-2024:0614
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2024:0607
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.8 Extended Update Support.

https://access.redhat.com/errata/RHSA-2024:0597
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.4 Telecommunications Update

https://access.redhat.com/errata/RHSA-2024:0558
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2024:0557
redhat Patch Available

Affected: Red Hat Enterprise Linux 7.

https://access.redhat.com/errata/RHSA-2024:0320

Vendor Advisories for CVE-2023-6816(5)

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
ubuntuxvfb (2:1.15.1-0ubuntu2.11+esm9) @ trusty2026-05-24ubuntu
ubuntuxwayland (2:1.18.4-0ubuntu0.12+esm9) @ xenial2026-05-24ubuntu
ubuntuxwayland (2:23.2.0-1ubuntu0.4) @ mantic2026-05-24ubuntu
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-0:1.12.0-14.el9_2.52024-01-31redhat
redhattigervnc-0:1.9.0-15.el8_2.92024-01-31redhat
redhattigervnc-0:1.11.0-8.el8_4.82024-01-30redhat
redhattigervnc-0:1.12.0-6.el8_6.92024-01-30redhat
redhattigervnc-0:1.13.1-2.el8_9.72024-01-30redhat
redhattigervnc-0:1.12.0-15.el8_8.72024-01-30redhat
redhattigervnc-0:1.13.1-3.el9_3.62024-01-30redhat
redhattigervnc-0:1.11.0-22.el9_0.82024-01-30redhat
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(2)

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

Additional Vendor Advisories

(14)

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.

  1. 2026-07-22 23:17 UTCEG score recompute▲ 2.00
  2. 2026-07-22 14:07 UTCEPSS rescore
  3. 2026-07-22 14:07 UTCEPSS rescore
  4. 2026-07-21 15:23 UTCEPSS rescore
  5. 2026-07-20 17:06 UTCEPSS rescore
  6. 2026-07-19 14:30 UTCEPSS rescore
  7. 2026-07-19 14:29 UTCEPSS rescore
  8. 2026-07-19 02:27 UTCEPSS rescore
  9. 2026-07-19 02:27 UTCEPSS rescore
  10. 2026-07-18 10:03 UTCEPSS rescore
  11. 2026-07-18 10:03 UTCEPSS rescore
  12. 2026-07-16 17:01 UTCEPSS rescore
  13. 2026-07-15 16:56 UTCEPSS rescore
  14. 2026-07-15 01:59 UTCEPSS rescore
  15. 2026-07-15 01:59 UTCEPSS rescore
  16. 2026-07-14 21:55 UTCOSV refresh
  17. 2026-07-13 22:28 UTCEPSS rescore
  18. 2026-07-13 22:28 UTCEPSS rescore
  19. 2026-07-13 06:11 UTCEPSS rescore
  20. 2026-07-12 05:45 UTCEPSS rescore
  21. 2026-07-12 05:45 UTCEPSS rescore
  22. 2026-07-11 08:26 UTCEPSS rescore
  23. 2026-07-09 19:08 UTCEPSS rescore
  24. 2026-07-08 15:13 UTCEPSS rescore
  25. 2026-07-07 13:45 UTCEPSS rescore
Show 70 more
  1. 2026-07-07 13:44 UTCEPSS rescore
  2. 2026-07-06 16:26 UTCEPSS rescore
  3. 2026-07-06 16:26 UTCEPSS rescore
  4. 2026-07-06 02:22 UTCEPSS rescore
  5. 2026-07-06 02:22 UTCEPSS rescore
  6. 2026-07-05 02:29 UTCEPSS rescore
  7. 2026-07-04 06:29 UTCEPSS rescore
  8. 2026-07-01 15:05 UTCEPSS rescore
  9. 2026-06-30 23:21 UTCEPSS rescore
  10. 2026-06-30 23:21 UTCEPSS rescore
  11. 2026-06-29 14:05 UTCEPSS rescore
  12. 2026-06-28 14:06 UTCEPSS rescore
  13. 2026-06-28 14:06 UTCEPSS rescore
  14. 2026-06-28 04:55 UTCEPSS rescore
  15. 2026-06-27 03:07 UTCEPSS rescore
  16. 2026-06-26 22:39 UTCOSV refresh
  17. 2026-06-25 13:48 UTCEPSS rescore
  18. 2026-06-25 13:48 UTCEPSS rescore
  19. 2026-06-24 14:04 UTCEPSS rescore
  20. 2026-06-24 14:04 UTCEPSS rescore
  21. 2026-06-23 21:31 UTCEPSS rescore
  22. 2026-06-23 21:31 UTCEPSS rescore
  23. 2026-06-22 14:24 UTCEPSS rescore
  24. 2026-06-22 14:24 UTCEPSS rescore
  25. 2026-06-21 14:55 UTCEPSS rescore
  26. 2026-06-21 14:55 UTCEPSS rescore
  27. 2026-06-21 01:58 UTCEPSS rescore
  28. 2026-06-21 01:58 UTCEPSS rescore
  29. 2026-06-19 19:24 UTCEPSS rescore
  30. 2026-06-19 19:24 UTCEPSS rescore
  31. 2026-06-18 17:51 UTCEPSS rescore
  32. 2026-06-17 17:51 UTCEPSS rescore
  33. 2026-06-16 17:51 UTCEPSS rescore
  34. 2026-06-16 17:51 UTCEPSS rescore
  35. 2026-06-15 17:47 UTCEPSS rescore
  36. 2026-06-14 23:16 UTCEPSS rescore
  37. 2026-06-13 22:59 UTCEPSS rescore
  38. 2026-06-13 22:59 UTCEPSS rescore
  39. 2026-06-12 23:11 UTCEPSS rescore
  40. 2026-06-11 13:59 UTCEPSS rescore
  41. 2026-06-10 22:17 UTCEPSS rescore
  42. 2026-06-10 13:21 UTCEPSS rescore
  43. 2026-06-09 09:48 UTCOSV refresh
  44. 2026-06-08 14:16 UTCEPSS rescore
  45. 2026-06-08 14:16 UTCEPSS rescore
  46. 2026-06-07 15:24 UTCEPSS rescore
  47. 2026-06-07 15:24 UTCEPSS rescore
  48. 2026-06-06 13:46 UTCEPSS rescore
  49. 2026-06-06 13:46 UTCEPSS rescore
  50. 2026-06-05 22:46 UTCEPSS rescore
  51. 2026-06-05 22:46 UTCEPSS rescore
  52. 2026-06-05 06:09 UTCEPSS rescore
  53. 2026-06-05 06:09 UTCEPSS rescore
  54. 2026-06-04 13:11 UTCEPSS rescore
  55. 2026-06-04 13:11 UTCEPSS rescore
  56. 2026-06-02 20:12 UTCEPSS rescore
  57. 2026-06-02 20:12 UTCEPSS rescore
  58. 2026-06-01 13:51 UTCEPSS rescore
  59. 2026-05-31 00:15 UTCEPSS rescore
  60. 2026-05-31 00:15 UTCEPSS rescore
  61. 2026-05-29 13:43 UTCEPSS rescore
  62. 2026-05-28 13:44 UTCEPSS rescore
  63. 2026-05-28 13:44 UTCEPSS rescore
  64. 2026-05-27 13:40 UTCEPSS rescore
  65. 2026-05-27 13:39 UTCEPSS rescore
  66. 2026-05-26 07:18 UTCEPSS rescore
  67. 2026-05-26 07:18 UTCEPSS rescore
  68. 2026-05-24 10:03 UTCEG score recompute
  69. 2026-05-24 10:03 UTCVendor advisory
  70. 2026-05-24 10:03 UTCGHSA enrichment

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2023-6816?
CVE-2023-6816 is a critical vulnerability published on January 18, 2024. A flaw was found in X.Org server. Both DeviceFocusEvent and the XIQueryPointer reply contain a bit for each logical button currently down. Buttons can be arbitrarily mapped to any value up to 255, but the X.Org Server was only allocating space for the device's particular number of buttons, leading…
When was CVE-2023-6816 disclosed?
CVE-2023-6816 was first published in the National Vulnerability Database on January 18, 2024, with the most recent update on March 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-6816 actively exploited?
CVE-2023-6816 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 79.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-6816?
CVE-2023-6816 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2023-6816?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-6816, 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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