CVE-2020-27223

MEDIUMNVD 5.28.5▲
EchelonGraph scoreHIGH confidence

Score elevated to 8.5 because EPSS predicts 78% probability of exploitation within the next 30 days (top 0.5% of all CVEs). NVD baseline CVSS 5.2 retained for reference. Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss, nvd
Trending — 3 sources updated this weekElevated
5.2
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 78%
CISA-KEV: Not listedEPSS: 78%CVSS: 5.2Exploit: NoneExposed: 0

A fix is available — apply it.

In Eclipse Jetty 9.4.6.v20170531 to 9.4.36.v20210114 (inclusive), 10.0.0, and 11.0.0 when Jetty handles a request containing multiple Accept headers with a large number of “quality” (i.e. q) parameters, the server may enter a denial of service (DoS) state due to high CPU usage processing those quality values, resulting in minutes of CPU time exhausted processing those quality values.

CVSS v3
5.2
EG Score
8.5(high)
EG Risk
74(Track)
EG Risk 74/100SSVC: 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
Severity85% × 45%
Exploitation78% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
99.5%
KEV
Not listed

Published

February 26, 2021

Last Modified

August 20, 2025

References (133)

Vendor Advisories for CVE-2020-27223(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(7)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatjetty2022-09-09redhat
redhatpatch2021-11-23redhat
redhatpatch2021-09-30redhat
redhatrhmtc/openshift-velero-plugin-rhel8:v1.4.6-42021-07-21redhat
redhatjenkins-0:2.277.3.1623846768-1.el72021-07-02redhat
redhatjenkins-0:2.289.1.1624365627-1.el72021-06-30redhat
redhatjenkins-0:2.277.3.1623853726-1.el82021-06-29redhat

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

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFixed inDependents
org.eclipse.jetty:jetty-server11.0.011.0.1—

Weakness Classification(2)

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

Additional Vendor Advisories

(8)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 7× in last 7d / 26× 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.

  1. 2026-07-23 01:52 UTCEG score recompute▲ 3.30
  2. 2026-07-22 22:38 UTCEG score recompute
  3. 2026-07-22 14:05 UTCEPSS rescore
  4. 2026-07-21 15:22 UTCEPSS rescore
  5. 2026-07-21 15:22 UTCEPSS rescore
  6. 2026-07-19 00:59 UTCOSV refresh
  7. 2026-07-16 16:59 UTCEPSS rescore
  8. 2026-07-15 16:55 UTCEPSS rescore
  9. 2026-07-15 16:55 UTCEPSS rescore
  10. 2026-07-13 22:27 UTCEPSS rescore
  11. 2026-07-13 22:27 UTCEPSS rescore
  12. 2026-07-12 05:44 UTCEPSS rescore
  13. 2026-07-07 13:43 UTCEPSS rescore
  14. 2026-07-04 06:29 UTCEPSS rescore
  15. 2026-07-04 06:29 UTCEPSS rescore
  16. 2026-07-01 08:18 UTCOSV refresh
  17. 2026-06-30 23:20 UTCEPSS rescore
  18. 2026-06-30 23:20 UTCEPSS rescore
  19. 2026-06-29 14:04 UTCEPSS rescore
  20. 2026-06-28 04:54 UTCEPSS rescore
  21. 2026-06-28 04:54 UTCEPSS rescore
  22. 2026-06-25 13:48 UTCEPSS rescore
  23. 2026-06-24 14:03 UTCEPSS rescore
  24. 2026-06-24 14:03 UTCEPSS rescore
  25. 2026-06-23 21:31 UTCEPSS rescore
Show 36 more
  1. 2026-06-23 21:31 UTCEPSS rescore
  2. 2026-06-17 17:50 UTCEPSS rescore
  3. 2026-06-16 17:50 UTCEPSS rescore
  4. 2026-06-15 17:46 UTCEPSS rescore
  5. 2026-06-14 23:15 UTCEPSS rescore
  6. 2026-06-13 22:58 UTCEPSS rescore
  7. 2026-06-13 13:13 UTCOSV refresh
  8. 2026-06-12 23:10 UTCEPSS rescore
  9. 2026-06-11 13:58 UTCEPSS rescore
  10. 2026-06-10 22:16 UTCEPSS rescore
  11. 2026-06-10 13:20 UTCEPSS rescore
  12. 2026-06-07 15:23 UTCEPSS rescore
  13. 2026-06-07 15:23 UTCEPSS rescore
  14. 2026-06-07 15:23 UTCEPSS rescore
  15. 2026-06-06 13:46 UTCEPSS rescore
  16. 2026-06-06 13:45 UTCEPSS rescore
  17. 2026-06-05 22:45 UTCEPSS rescore
  18. 2026-06-05 22:45 UTCEPSS rescore
  19. 2026-06-05 06:08 UTCEPSS rescore
  20. 2026-06-05 06:08 UTCEPSS rescore
  21. 2026-06-04 13:10 UTCEPSS rescore
  22. 2026-06-04 13:10 UTCEPSS rescore
  23. 2026-06-02 20:11 UTCEPSS rescore
  24. 2026-06-02 20:11 UTCEPSS rescore
  25. 2026-06-01 13:50 UTCEPSS rescore
  26. 2026-05-31 22:29 UTCEPSS rescore
  27. 2026-05-31 22:29 UTCEPSS rescore
  28. 2026-05-29 13:42 UTCEPSS rescore
  29. 2026-05-28 13:43 UTCEPSS rescore
  30. 2026-05-28 13:43 UTCEPSS rescore
  31. 2026-05-27 13:39 UTCEPSS rescore
  32. 2026-05-27 13:39 UTCEPSS rescore
  33. 2026-05-26 20:19 UTCEG score recompute
  34. 2026-05-26 20:19 UTCVendor advisory
  35. 2026-05-26 13:42 UTCEPSS rescore
  36. 2026-05-26 13:42 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCmotikan2010/CVE-2020-27223
    First seen Mar 19, 2021

    CVE-2020-27223 Vulnerability App & PoC

    Open source ↗

Frequently asked(5)

What is CVE-2020-27223?
CVE-2020-27223 is a medium vulnerability published on February 26, 2021. In Eclipse Jetty 9.4.6.v20170531 to 9.4.36.v20210114 (inclusive), 10.0.0, and 11.0.0 when Jetty handles a request containing multiple Accept headers with a large number of “quality” (i.e. q) parameters, the server may enter a denial of service (DoS) state due to high CPU usage processing those…
When was CVE-2020-27223 disclosed?
CVE-2020-27223 was first published in the National Vulnerability Database on February 26, 2021, with the most recent update on August 20, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-27223 actively exploited?
CVE-2020-27223 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2020-27223?
CVE-2020-27223 has a CVSS v3 base score of 5.2 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 8.5.
How do I remediate CVE-2020-27223?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-27223, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2020-27223

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