CVE-2021-47177

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2024-03-25. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

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

In the Linux kernel, the following vulnerability has been resolved:

iommu/vt-d: Fix sysfs leak in alloc_iommu()

iommu_device_sysfs_add() is called before, so is has to be cleaned on subsequent errors.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
25(Track)
EG Risk 25/100SSVC: 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
Severity55% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
15%
KEV
Not listed

Published

March 25, 2024

Last Modified

March 17, 2025

References (12)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 44× 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 107 total refreshes for this CVE.

  1. 2026-07-26 14:52 UTCEPSS rescore
  2. 2026-07-25 14:15 UTCEPSS rescore
  3. 2026-07-24 14:15 UTCEPSS rescore
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  6. 2026-07-23 02:06 UTCEG score recompute
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  21. 2026-07-14 15:55 UTCOSV refresh
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  1. 2026-07-11 08:25 UTCEPSS rescore
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  22. 2026-06-27 03:07 UTCEPSS rescore
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  24. 2026-06-26 17:07 UTCOSV refresh
  25. 2026-06-25 13:48 UTCEPSS rescore
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  27. 2026-06-24 14:03 UTCEPSS rescore
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  45. 2026-06-13 22:58 UTCEPSS rescore
  46. 2026-06-13 22:58 UTCEPSS rescore
  47. 2026-06-12 23:10 UTCEPSS rescore
  48. 2026-06-11 13:58 UTCEPSS rescore
  49. 2026-06-10 22:16 UTCEPSS rescore
  50. 2026-06-10 13:20 UTCEPSS rescore
  51. 2026-06-08 23:55 UTCOSV refresh
  52. 2026-06-08 14:15 UTCEPSS rescore
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  54. 2026-06-08 14:15 UTCEPSS rescore
  55. 2026-06-07 15:23 UTCEPSS rescore
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  57. 2026-06-06 13:46 UTCEPSS rescore
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  67. 2026-06-01 13:50 UTCEPSS rescore
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  69. 2026-05-31 22:29 UTCEPSS rescore
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  72. 2026-05-29 13:42 UTCEPSS rescore
  73. 2026-05-28 13:43 UTCEPSS rescore
  74. 2026-05-28 13:43 UTCEPSS rescore
  75. 2026-05-27 13:39 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-47177?
CVE-2021-47177 is a medium vulnerability published on March 25, 2024. In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Fix sysfs leak in alloc_iommu() iommudevicesysfs_add() is called before, so is has to be cleaned on subsequent errors.
When was CVE-2021-47177 disclosed?
CVE-2021-47177 was first published in the National Vulnerability Database on March 25, 2024, with the most recent update on March 17, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-47177 actively exploited?
CVE-2021-47177 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 85.0% of all scored CVEs.
What is the CVSS score of CVE-2021-47177?
CVE-2021-47177 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2021-47177?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-47177, 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.

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