CVE-2021-3409

MEDIUMNVD 5.75.7—
EchelonGraph scoreMEDIUM confidence

Score 5.7 from GitHub Security Advisory published 2022-05-24. NVD baseline CVSS 5.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.7EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.7Exploit: None knownExposed: 0

A fix is available — apply it.

The patch for CVE-2020-17380/CVE-2020-25085 was found to be ineffective, thus making QEMU vulnerable to the out-of-bounds read/write access issues previously found in the SDHCI controller emulation code. This flaw allows a malicious privileged guest to crash the QEMU process on the host, resulting in a denial of service or potential code execution. QEMU up to (including) 5.2.0 is affected by this.

CVSS v3
5.7
EG Score
5.7(medium)
EG Risk
30(Track)
EG Risk 30/100SSVC: 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
Severity57% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
40%
KEV
Not listed

Published

March 23, 2021

Last Modified

November 21, 2024

References (10)

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuqemu-system-x86-xen (1:5.2+dfsg-9ubuntu3.1) @ hirsute2026-05-26ubuntu

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 6 ecosystems)
Debian:10(1)
PackageVulnerable rangeFixed inDependents
qemu1:3.1+dfsg-8 ... 1:3.1+dfsg-8~deb10u1 (10 versions)1:3.1+dfsg-8+deb10u10—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
qemu—1:5.2+dfsg-10—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
qemu—1:5.2+dfsg-10—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
qemu—1:5.2+dfsg-10—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
qemu—1:5.2+dfsg-10—
Debian:9(1)
PackageVulnerable rangeFixed inDependents
qemu1:2.8+dfsg-6 ... 1:2.8+dfsg-6+deb9u9 (14 versions)1:2.8+dfsg-6+deb9u14—

Weakness Classification(1)

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

All Vendor Advisories

(2)

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 9× 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 138 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2021-3409?
CVE-2021-3409 is a medium vulnerability published on March 23, 2021. The patch for CVE-2020-17380/CVE-2020-25085 was found to be ineffective, thus making QEMU vulnerable to the out-of-bounds read/write access issues previously found in the SDHCI controller emulation code. This flaw allows a malicious privileged guest to crash the QEMU process on the host, resulting…
When was CVE-2021-3409 disclosed?
CVE-2021-3409 was first published in the National Vulnerability Database on March 23, 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-2021-3409 actively exploited?
CVE-2021-3409 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 59.8% of all scored CVEs.
What is the CVSS score of CVE-2021-3409?
CVE-2021-3409 has a CVSS v3 base score of 5.7 (NVD).
How do I remediate CVE-2021-3409?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-3409, 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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