CVE-2020-5403

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 1.1% (65th percentile of EPSS-scored CVEs). 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: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.1%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Reactor Netty HttpServer, versions 0.9.3 and 0.9.4, is exposed to a URISyntaxException that causes the connection to be closed prematurely instead of producing a 400 response.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
39
EG Risk 39/100

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 (value × EchelonGraph’s weight)
Severity75% × 45%
The EG Score, 7.5 of 10.
Exploitation1.1% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability30% × 15%
EchelonGraph's default before algorithm v3.4: CISA had not published Automatable for this CVE.
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
1.1%
EPSS %ILE
65th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

Published

March 3, 2020

Last Modified

September 4, 2026

References (1)

Affected Packages

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFix by version rangeDependents
io.projectreactor.netty:reactor-netty-http—
  • 0.9.3 up to 0.9.5: fixed in 0.9.5
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 27× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 87 of 162 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 13 repeat rows among the latest 100 are merged into the row they repeat. The 75 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-11 13:43 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  2. 2026-10-10 19:56 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  3. 2026-10-09 20:04 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  4. 2026-10-08 16:39 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  5. 2026-10-07 23:44 UTCEPSS rescoreEPSS 1.1% · 65th percentile
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  10. 2026-10-02 16:22 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  11. 2026-10-01 19:46 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  12. 2026-09-30 15:20 UTCEG score recompute
  13. 2026-09-30 14:59 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  14. 2026-09-27 13:41 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  15. 2026-09-26 15:54 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  16. 2026-09-26 00:21 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  17. 2026-09-24 14:00 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  18. 2026-09-24 01:06 UTCOSV refresh
  19. 2026-09-22 14:44 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  20. 2026-09-21 20:28 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  21. 2026-09-19 15:37 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  22. 2026-09-18 19:23 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  23. 2026-09-17 19:22 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  24. 2026-09-16 14:04 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  25. 2026-09-15 03:06 UTCEPSS rescoreEPSS 1.1% · 64th percentile
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  1. 2026-09-13 16:43 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  2. 2026-09-12 14:57 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  3. 2026-09-08 21:56 UTCEPSS rescoreEPSS 1.1% · 64th percentile
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  5. 2026-09-06 13:44 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  6. 2026-09-05 15:25 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  7. 2026-09-04 19:08 UTCEG score recompute
  8. 2026-09-04 13:57 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  9. 2026-09-04 05:03 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  10. 2026-09-02 14:08 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  11. 2026-09-01 03:32 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  12. 2026-08-30 19:14 UTCEPSS rescoreEPSS 1.1% · 64th percentile
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  14. 2026-08-28 21:37 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  15. 2026-08-27 14:21 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  16. 2026-08-26 14:42 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  17. 2026-08-21 23:45 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  18. 2026-08-21 03:23 UTCOSV refresh
  19. 2026-08-19 17:00 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  20. 2026-08-18 13:44 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  21. 2026-08-17 13:43 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  22. 2026-08-16 14:52 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  23. 2026-08-16 02:11 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  24. 2026-08-15 01:27 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  25. 2026-08-13 21:57 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  26. 2026-08-12 13:47 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  27. 2026-08-09 13:43 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  28. 2026-08-08 16:33 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  29. 2026-08-07 16:23 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  30. 2026-08-06 13:43 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  31. 2026-08-05 19:14 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  32. 2026-08-05 18:41 UTCOSV refresh
  33. 2026-08-04 15:06 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  34. 2026-08-04 10:34 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  35. 2026-08-02 02:24 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  36. 2026-08-01 04:12 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  37. 2026-07-30 16:25 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  38. 2026-07-30 01:27 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  39. 2026-07-28 15:33 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  40. 2026-07-26 14:52 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  41. 2026-07-25 14:15 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  42. 2026-07-23 14:15 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  43. 2026-07-23 01:54 UTCEG score recompute
  44. 2026-07-22 22:40 UTCEG score recompute
  45. 2026-07-22 14:05 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  46. 2026-07-21 15:22 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  47. 2026-07-20 17:04 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  48. 2026-07-19 18:18 UTCOSV refresh
  49. 2026-07-19 14:28 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  50. 2026-07-19 02:26 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
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  59. 2026-07-09 19:07 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  60. 2026-07-08 15:12 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  61. 2026-07-07 13:43 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  62. 2026-07-06 16:25 UTCEPSS rescoreEPSS 1.1% · 62nd percentile

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2020-5403?
CVE-2020-5403 is a high-severity vulnerability; its CVE record was published on March 3, 2020. Reactor Netty HttpServer, versions 0.9.3 and 0.9.4, is exposed to a URISyntaxException that causes the connection to be closed prematurely instead of producing a 400 response.
When was CVE-2020-5403 made public?
CVE-2020-5403 was made public on February 27, 2020: that is the date its CVE record's CNA, pivotal, gives for when the vulnerability was made public. The CVE record itself was published on March 3, 2020. EchelonGraph's copy of the record carries a last-modified date of September 4, 2026; the record at its source may have been updated since.
Is CVE-2020-5403 actively exploited?
CVE-2020-5403 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.1% probability of exploitation in the next 30 days (65th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2020-5403?
CVE-2020-5403 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2020-5403?
A fix for CVE-2020-5403 is available: update to the fixed version the vendor names in its advisory.

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