CVE-2021-31407

HIGHNVD 8.68.6—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.6 under NVD CVSS v3. EPSS exploit probability: 2.4%, top 18% 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
8.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 8.6Exploit: None knownExposed: 0

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

Vulnerability in OSGi integration in com.vaadin:flow-server versions 1.2.0 through 2.4.7 (Vaadin 12.0.0 through 14.4.9), and 6.0.0 through 6.0.1 (Vaadin 19.0.0) allows attacker to access application classes and resources on the server via crafted HTTP request.

CVSS v3
8.6
EG Score
8.6(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
Severity86% × 45%
Exploitation2% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
83%
KEV
Not listed

Published

April 23, 2021

Last Modified

November 21, 2024

Advisory Details (4)

Auto-updated Sep 1, 2026
Patch available. Sources: github_pr.
generic

CVE-2021-31407: Server classes and resources exposure in OSGi applications using Vaadin 12-14 and 19

https://vaadin.com/security/cve-2021-31407
generic

Vaadin OSGi applications should not expose relevant classpath content as static resources · Issue #50 · vaadin/osgi · GitHub

https://github.com/vaadin/osgi/issues/50
github_pr

fix: avoid exposing ServletContext resources via StaticFileServer (#10261)

Fix merged in vaadin/flow PR #10269 on 2021-03-12 — awaiting tagged release

https://github.com/vaadin/flow/pull/10269
github_pr Patch Available

refactor: use StaticFileHandler as a service

Patch available: vaadin/flow 23.7.0-beta4 (PR #10229 merged 2021-03-10)

https://github.com/vaadin/flow/pull/10229

Affected Packages

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFixed inDependents
com.vaadin:flow-server6.0.06.0.1—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 31× 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 163 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-31407?
CVE-2021-31407 is a high vulnerability published on April 23, 2021. Vulnerability in OSGi integration in com.vaadin:flow-server versions 1.2.0 through 2.4.7 (Vaadin 12.0.0 through 14.4.9), and 6.0.0 through 6.0.1 (Vaadin 19.0.0) allows attacker to access application classes and resources on the server via crafted HTTP request.
When was CVE-2021-31407 disclosed?
CVE-2021-31407 was first published in the National Vulnerability Database on April 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-2021-31407 actively exploited?
CVE-2021-31407 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 16.9% of all scored CVEs.
What is the CVSS score of CVE-2021-31407?
CVE-2021-31407 has a CVSS v3 base score of 8.6 (NVD).
How do I remediate CVE-2021-31407?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-31407, 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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