CVE-2018-19966

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-13. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

An issue was discovered in Xen through 4.11.x allowing x86 PV guest OS users to cause a denial of service (host OS crash) or possibly gain host OS privileges because of an interpretation conflict for a union data structure associated with shadow paging. NOTE: this issue exists because of an incorrect fix for CVE-2017-15595.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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
Severity88% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
38%
KEV
Not listed

Published

December 8, 2018

Last Modified

November 21, 2024

Advisory Details (5)

Auto-updated Aug 18, 2026
Patch available.
generic

[SECURITY] Fedora 28 Update: xen-4.10.3-2.fc28 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UXC6BME7SXJI2ZIATNXCAH7RGPI4UKTT/
generic Patch Available

[SECURITY] [DLA 1949-1] xen security update

https://lists.debian.org/debian-lts-announce/2019/10/msg00008.html
generic

CVE-2018-19961 - PSIRT.COM

http://www.securityfocus.com/bid/106182
generic

XSA-280 - Xen Security Advisories

https://xenbits.xen.org/xsa/advisory-280.html
generic

[SECURITY] [DSA 4369-1] xen security update

https://www.debian.org/security/2019/dsa-4369

Affected Packages

(25 across 25 ecosystems)
Alpine:v3.10(1)
PackageVulnerable rangeFixed inDependents
xen—4.11.1-r0—
Alpine:v3.11(1)
PackageVulnerable rangeFixed inDependents
xen—4.11.1-r0—
Alpine:v3.12(1)
PackageVulnerable rangeFixed inDependents
xen—4.11.1-r0—
Alpine:v3.13(1)
PackageVulnerable rangeFixed inDependents
xen—4.11.1-r0—
Alpine:v3.14(1)
PackageVulnerable rangeFixed inDependents
xen—4.11.1-r0—
Alpine:v3.15(1)
PackageVulnerable rangeFixed inDependents
xen—4.11.1-r0—
Alpine:v3.16(1)
PackageVulnerable rangeFixed inDependents
xen—4.11.1-r0—
Alpine:v3.17(1)
PackageVulnerable rangeFixed inDependents
xen—4.11.1-r0—
Alpine:v3.18(1)
PackageVulnerable rangeFixed inDependents
xen—4.11.1-r0—
Alpine:v3.19(1)
PackageVulnerable rangeFixed inDependents
xen—4.11.1-r0—
Alpine:v3.20(1)
PackageVulnerable rangeFixed inDependents
xen—4.11.1-r0—
Alpine:v3.21(1)
PackageVulnerable rangeFixed inDependents
xen—4.11.1-r0—
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
xen—4.11.1-r0—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
xen—4.11.1-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
xen—4.11.1-r0—
Alpine:v3.6(1)
PackageVulnerable rangeFixed inDependents
xen—4.8.5-r0—
Alpine:v3.7(1)
PackageVulnerable rangeFixed inDependents
xen—4.9.3-r1—
Alpine:v3.8(1)
PackageVulnerable rangeFixed inDependents
xen—4.10.2-r1—
Alpine:v3.9(1)
PackageVulnerable rangeFixed inDependents
xen—4.11.1-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
xen—4.11.1-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
xen—4.11.1-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
xen—4.11.1-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
xen—4.11.1-1—
Debian:8(1)
PackageVulnerable rangeFixed inDependents
xen4.4.1-9 ... 4.4.4lts4-0+deb8u1 (15 versions)4.4.4lts5-0+deb8u1—
Debian:9(1)
PackageVulnerable rangeFixed inDependents
xen4.8.1-1+deb9u1 ... 4.8.4+xsa273+shim4.10.1+xsa273-1+deb9u10 (12 versions)4.8.5+shim4.10.2+xsa282-1+deb9u11—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 24× 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 153 total refreshes for this CVE.

  1. 2026-09-18 19:22 UTCEPSS rescore
  2. 2026-09-17 19:22 UTCEPSS rescore
  3. 2026-09-16 05:06 UTCEPSS rescore
  4. 2026-09-15 03:05 UTCEPSS rescore
  5. 2026-09-13 16:42 UTCEPSS rescore
  6. 2026-09-12 14:56 UTCEPSS rescore
  7. 2026-09-11 14:47 UTCEPSS rescore
  8. 2026-09-11 09:32 UTCEPSS rescore
  9. 2026-09-08 20:34 UTCOSV refresh
  10. 2026-09-07 15:57 UTCEPSS rescore
  11. 2026-09-06 13:43 UTCEPSS rescore
  12. 2026-09-05 15:24 UTCEPSS rescore
  13. 2026-09-04 13:56 UTCEPSS rescore
  14. 2026-09-04 05:02 UTCEPSS rescore
  15. 2026-09-02 14:07 UTCEPSS rescore
  16. 2026-09-01 13:49 UTCEPSS rescore
  17. 2026-09-01 03:32 UTCEPSS rescore
  18. 2026-08-28 21:36 UTCEPSS rescore
  19. 2026-08-27 14:21 UTCEPSS rescore
  20. 2026-08-26 14:42 UTCEPSS rescore
  21. 2026-08-25 13:44 UTCEPSS rescore
  22. 2026-08-22 05:37 UTCOSV refresh
  23. 2026-08-21 23:45 UTCEPSS rescore
  24. 2026-08-20 22:51 UTCEPSS rescore
  25. 2026-08-19 17:00 UTCEPSS rescore
Show 75 more
  1. 2026-08-18 13:44 UTCEPSS rescore
  2. 2026-08-17 13:43 UTCEPSS rescore
  3. 2026-08-16 14:51 UTCEPSS rescore
  4. 2026-08-16 02:10 UTCEPSS rescore
  5. 2026-08-15 01:26 UTCEPSS rescore
  6. 2026-08-13 21:56 UTCEPSS rescore
  7. 2026-08-12 13:46 UTCEPSS rescore
  8. 2026-08-09 13:43 UTCEPSS rescore
  9. 2026-08-08 16:32 UTCEPSS rescore
  10. 2026-08-07 16:23 UTCEPSS rescore
  11. 2026-08-06 13:42 UTCEPSS rescore
  12. 2026-08-06 08:40 UTCOSV refresh
  13. 2026-08-05 19:13 UTCEPSS rescore
  14. 2026-08-04 15:05 UTCEPSS rescore
  15. 2026-08-02 02:23 UTCEPSS rescore
  16. 2026-08-01 04:12 UTCEPSS rescore
  17. 2026-07-30 16:24 UTCEPSS rescore
  18. 2026-07-30 01:27 UTCEPSS rescore
  19. 2026-07-28 15:32 UTCEPSS rescore
  20. 2026-07-26 14:51 UTCEPSS rescore
  21. 2026-07-26 14:51 UTCEPSS rescore
  22. 2026-07-25 14:14 UTCEPSS rescore
  23. 2026-07-24 14:14 UTCEPSS rescore
  24. 2026-07-24 14:14 UTCEPSS rescore
  25. 2026-07-23 14:15 UTCEPSS rescore
  26. 2026-07-23 01:35 UTCEG score recompute
  27. 2026-07-22 22:15 UTCEG score recompute
  28. 2026-07-22 14:05 UTCEPSS rescore
  29. 2026-07-21 15:22 UTCEPSS rescore
  30. 2026-07-21 01:47 UTCOSV refresh
  31. 2026-07-20 17:04 UTCEPSS rescore
  32. 2026-07-20 17:04 UTCEPSS rescore
  33. 2026-07-19 14:28 UTCEPSS rescore
  34. 2026-07-19 02:26 UTCEPSS rescore
  35. 2026-07-19 02:26 UTCEPSS rescore
  36. 2026-07-16 16:59 UTCEPSS rescore
  37. 2026-07-16 16:59 UTCEPSS rescore
  38. 2026-07-15 16:55 UTCEPSS rescore
  39. 2026-07-15 16:55 UTCEPSS rescore
  40. 2026-07-15 01:56 UTCEPSS rescore
  41. 2026-07-15 01:56 UTCEPSS rescore
  42. 2026-07-13 22:27 UTCEPSS rescore
  43. 2026-07-13 22:26 UTCEPSS rescore
  44. 2026-07-13 06:10 UTCEPSS rescore
  45. 2026-07-12 05:43 UTCEPSS rescore
  46. 2026-07-11 08:24 UTCEPSS rescore
  47. 2026-07-09 19:06 UTCEPSS rescore
  48. 2026-07-08 15:11 UTCEPSS rescore
  49. 2026-07-07 13:42 UTCEPSS rescore
  50. 2026-07-07 13:42 UTCEPSS rescore
  51. 2026-07-06 16:24 UTCEPSS rescore
  52. 2026-07-06 16:24 UTCEPSS rescore
  53. 2026-07-06 02:20 UTCEPSS rescore
  54. 2026-07-05 02:27 UTCEPSS rescore
  55. 2026-07-04 06:28 UTCEPSS rescore
  56. 2026-07-04 06:28 UTCEPSS rescore
  57. 2026-07-03 20:56 UTCOSV refresh
  58. 2026-07-02 16:54 UTCEPSS rescore
  59. 2026-07-01 15:03 UTCEPSS rescore
  60. 2026-07-01 15:03 UTCEPSS rescore
  61. 2026-06-30 23:20 UTCEPSS rescore
  62. 2026-06-30 23:19 UTCEPSS rescore
  63. 2026-06-29 14:03 UTCEPSS rescore
  64. 2026-06-28 14:04 UTCEPSS rescore
  65. 2026-06-28 04:53 UTCEPSS rescore
  66. 2026-06-28 04:53 UTCEPSS rescore
  67. 2026-06-27 03:06 UTCEPSS rescore
  68. 2026-06-27 03:06 UTCEPSS rescore
  69. 2026-06-25 13:47 UTCEPSS rescore
  70. 2026-06-25 13:47 UTCEPSS rescore
  71. 2026-06-24 14:02 UTCEPSS rescore
  72. 2026-06-24 14:02 UTCEPSS rescore
  73. 2026-06-23 21:30 UTCEPSS rescore
  74. 2026-06-23 21:30 UTCEPSS rescore
  75. 2026-06-23 21:30 UTCEPSS rescore

Frequently asked(5)

What is CVE-2018-19966?
CVE-2018-19966 is a high vulnerability published on December 8, 2018. An issue was discovered in Xen through 4.11.x allowing x86 PV guest OS users to cause a denial of service (host OS crash) or possibly gain host OS privileges because of an interpretation conflict for a union data structure associated with shadow paging. NOTE: this issue exists because of an…
When was CVE-2018-19966 disclosed?
CVE-2018-19966 was first published in the National Vulnerability Database on December 8, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-19966 actively exploited?
CVE-2018-19966 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 62.5% of all scored CVEs.
What is the CVSS score of CVE-2018-19966?
CVE-2018-19966 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2018-19966?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-19966, 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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