CVE-2021-38199

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 1.2%, top 34% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 6.5Exploit: None knownExposed: 0

A fix is available — apply it.

fs/nfs/nfs4client.c in the Linux kernel before 5.13.4 has incorrect connection-setup ordering, which allows operators of remote NFSv4 servers to cause a denial of service (hanging of mounts) by arranging for those servers to be unreachable during trunking detection.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
34(Track)
EG Risk 34/100SSVC: 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
Severity65% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
68%
KEV
Not listed

Published

August 8, 2021

Last Modified

November 21, 2024

References (12)

Patch Availability(8)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-hwe-16.04-edge (4.15.0.162.155) @ xenial2026-05-26ubuntu
ubuntulinux-azure-5.8-headers-5.8.0-1043 (5.8.0-1043.46~20.04.1) @ focal2026-05-26ubuntu
ubuntulinux-image-lowlatency (5.4.0.88.92) @ focal2026-05-26ubuntu
ubuntulinux-modules-5.11.0-1017-azure (5.11.0-1017.18) @ hirsute2026-05-26ubuntu
ubuntulinux-image-lowlatency (5.11.0.37.39) @ hirsute2026-05-26ubuntu
ubuntulinux-oem-20.04c (5.13.0.1014.18) @ focal2026-05-26ubuntu
ubuntulinux-oem-20.04b (5.10.0.1049.51) @ focal2026-05-26ubuntu
ubuntulinux-headers-raspi-hwe-18.04 (5.4.0.1044.47) @ bionic2026-05-26ubuntu

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

(6 across 5 ecosystems)
Debian:9(2)
PackageVulnerable rangeFixed inDependents
linux4.9.107-1 ... 4.9.88-1~bpo8+1 (68 versions)4.9.290-1—
linux-4.194.19.132-1~deb9u1 ... 4.19.194-3~deb9u1 (9 versions)4.19.208-1~deb9u1—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux5.10.46-45.10.46-5—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux—5.14.6-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux—5.14.6-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux—5.14.6-1—

All Vendor Advisories

(9)

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 8× in last 7d / 32× 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 165 total refreshes for this CVE.

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

Related CVEs(same vendor)

Frequently asked(5)

What is CVE-2021-38199?
CVE-2021-38199 is a medium vulnerability published on August 8, 2021. fs/nfs/nfs4client.c in the Linux kernel before 5.13.4 has incorrect connection-setup ordering, which allows operators of remote NFSv4 servers to cause a denial of service (hanging of mounts) by arranging for those servers to be unreachable during trunking detection.
When was CVE-2021-38199 disclosed?
CVE-2021-38199 was first published in the National Vulnerability Database on August 8, 2021, 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-2021-38199 actively exploited?
CVE-2021-38199 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 32.1% of all scored CVEs.
What is the CVSS score of CVE-2021-38199?
CVE-2021-38199 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2021-38199?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-38199, 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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