CVE-2020-15563

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2022-05-24. NVD baseline CVSS 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 6.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

An issue was discovered in Xen through 4.13.x, allowing x86 HVM guest OS users to cause a hypervisor crash. An inverted conditional in x86 HVM guests' dirty video RAM tracking code allows such guests to make Xen de-reference a pointer guaranteed to point at unmapped space. A malicious or buggy HVM guest may cause the hypervisor to crash, resulting in Denial of Service (DoS) affecting the entire host. Xen versions from 4.8 onwards are affected. Xen versions 4.7 and earlier are not affected. Only x86 systems are affected. Arm systems are not affected. Only x86 HVM guests using shadow paging can leverage the vulnerability. In addition, there needs to be an entity actively monitoring a guest's video frame buffer (typically for display purposes) in order for such a guest to be able to leverage the vulnerability. x86 PV guests, as well as x86 HVM guests using hardware assisted paging (HAP), cannot leverage the vulnerability.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
34
EG Risk 34/100CISA SSVC

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
Severity65% × 45%
Exploitation0% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
33rd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 7, 2020

Last Modified

November 21, 2024

References (16)

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntuxen-system-armhf (4.11.3+24-g14b62ab3e5-1ubuntu2.3) @ focal2026-05-27ubuntu

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.

Affected Packages

(21 across 21 ecosystems)
Alpine:v3.10(1)
PackageVulnerable rangeFix by version rangeDependents
xen—
  • 4.8.0 up to 4.12.3-r2: fixed in 4.12.3-r2
—
Alpine:v3.11(1)
PackageVulnerable rangeFix by version rangeDependents
xen—
  • 4.8.0 up to 4.13.1-r2: fixed in 4.13.1-r2
—
Alpine:v3.12(1)
PackageVulnerable rangeFix by version rangeDependents
xen—
  • 4.8.0 up to 4.13.1-r2: fixed in 4.13.1-r2
—
Alpine:v3.13(1)
PackageVulnerable rangeFix by version rangeDependents
xen—
  • 4.8.0 up to 4.13.1-r4: fixed in 4.13.1-r4
—
Alpine:v3.14(1)
PackageVulnerable rangeFix by version rangeDependents
xen—
  • 4.8.0 up to 4.13.1-r4: fixed in 4.13.1-r4
—
Alpine:v3.15(1)
PackageVulnerable rangeFix by version rangeDependents
xen—
  • 4.8.0 up to 4.13.1-r4: fixed in 4.13.1-r4
—
Alpine:v3.16(1)
PackageVulnerable rangeFix by version rangeDependents
xen—
  • 4.8.0 up to 4.13.1-r4: fixed in 4.13.1-r4
—
Alpine:v3.17(1)
PackageVulnerable rangeFix by version rangeDependents
xen—
  • 4.8.0 up to 4.13.1-r4: fixed in 4.13.1-r4
—
Alpine:v3.18(1)
PackageVulnerable rangeFix by version rangeDependents
xen—
  • 4.8.0 up to 4.13.1-r4: fixed in 4.13.1-r4
—
Alpine:v3.19(1)
PackageVulnerable rangeFix by version rangeDependents
xen—
  • 4.8.0 up to 4.13.1-r4: fixed in 4.13.1-r4
—
Alpine:v3.20(1)
PackageVulnerable rangeFix by version rangeDependents
xen—
  • 4.8.0 up to 4.13.1-r4: fixed in 4.13.1-r4
—
Alpine:v3.21(1)
PackageVulnerable rangeFix by version rangeDependents
xen—
  • 4.8.0 up to 4.13.1-r4: fixed in 4.13.1-r4
—
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
xen—
  • 4.8.0 up to 4.13.1-r4: fixed in 4.13.1-r4
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
xen—
  • 4.8.0 up to 4.13.1-r4: fixed in 4.13.1-r4
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
xen—
  • 4.8.0 up to 4.13.1-r4: fixed in 4.13.1-r4
—
Alpine:v3.9(1)
PackageVulnerable rangeFix by version rangeDependents
xen—
  • 4.8.0 up to 4.11.4-r0: fixed in 4.11.4-r0
—
Debian:10(1)
PackageVulnerable rangeFix by version rangeDependents
xen4.11.1+92-g6c33308a8d-2, 4.11.3+24-g14b62ab3e5-1, 4.11.3+24-g14b62ab3e5-1~deb10u1, 4.11.4-1
  • every version up to 4.11.4+24-gddaaccbbab-1~deb10u1: fixed in 4.11.4+24-gddaaccbbab-1~deb10u1
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
xen—
  • every version up to 4.11.4+24-gddaaccbbab-1: fixed in 4.11.4+24-gddaaccbbab-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
xen—
  • every version up to 4.11.4+24-gddaaccbbab-1: fixed in 4.11.4+24-gddaaccbbab-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
xen—
  • every version up to 4.11.4+24-gddaaccbbab-1: fixed in 4.11.4+24-gddaaccbbab-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
xen—
  • every version up to 4.11.4+24-gddaaccbbab-1: fixed in 4.11.4+24-gddaaccbbab-1
—

Weakness Classification(2)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 6× in last 7d / 30× 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 170 total refreshes for this CVE.

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

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2020-15563?
CVE-2020-15563 is a medium vulnerability published on July 7, 2020. An issue was discovered in Xen through 4.13.x, allowing x86 HVM guest OS users to cause a hypervisor crash. An inverted conditional in x86 HVM guests' dirty video RAM tracking code allows such guests to make Xen de-reference a pointer guaranteed to point at unmapped space. A malicious or buggy HVM…
When was CVE-2020-15563 disclosed?
CVE-2020-15563 was first published on July 7, 2020, 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-2020-15563 actively exploited?
CVE-2020-15563 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (33rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2020-15563?
CVE-2020-15563 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2020-15563?
A fix for CVE-2020-15563 is available: update to the fixed version the vendor names in its advisory.

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