CVE-2020-8558

MEDIUMNVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.4 under NVD CVSS v3. EPSS exploit probability: 3.6%, top 12% 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
Trending — 3 sources updated this weekElevated
5.4
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 4%CVSS: 5.4Exploit: NoneExposed: 0

A fix is available — apply it.

The Kubelet and kube-proxy components in versions 1.1.0-1.16.10, 1.17.0-1.17.6, and 1.18.0-1.18.3 were found to contain a security issue which allows adjacent hosts to reach TCP and UDP services bound to 127.0.0.1 running on the node or in the node's network namespace. Such a service is generally thought to be reachable only by other processes on the same host, but due to this defeect, could be reachable by other hosts on the same LAN as the node, or by containers running on the same node as the service.

CVSS v3
5.4
EG Score
5.4(medium)
EG Risk
45(Track)
EG Risk 45/100SSVC: 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
Severity54% × 45%
Exploitation40% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
88.2%
KEV
Not listed

Published

July 27, 2020

Last Modified

November 21, 2024

References (6)

Vendor Advisories for CVE-2020-8558(2)

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
redhatopenshift4/ose-hyperkube:v4.3.31-202007272153.p02020-08-05redhat
redhatopenshift-0:4.3.31-202007280738.p0.git.0.9884401.el72020-08-05redhat
redhatatomic-openshift-0:3.11.248-1.git.0.92ee8ac.el72020-07-27redhat
redhatopenshift4/ose-hyperkube:v4.4.0-202007120152.p02020-07-21redhat
redhatopenshift-0:4.4.0-202007090832.p0.git.0.bc32fb1.el72020-07-21redhat
redhatopenshift4/ose-hyperkube:v4.5.0-202007100518.p02020-07-13redhat
redhatopenshift-0:4.5.0-202007012112.p0.git.0.582d7fc.el72020-07-13redhat

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)
Go(1)
PackageVulnerable rangeFixed inDependents
k8s.io/kubernetes—1.18.4—

Weakness Classification(1)

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

Additional Vendor Advisories

(5)

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 14× in last 7d / 51× 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 01:55 UTCEG score recompute
  2. 2026-07-22 22:41 UTCEG score recompute
  3. 2026-07-22 14:05 UTCEPSS rescore
  4. 2026-07-21 15:22 UTCEPSS rescore
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  6. 2026-07-20 17:04 UTCEPSS rescore
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  8. 2026-07-19 14:28 UTCEPSS rescore
  9. 2026-07-19 14:28 UTCEPSS rescore
  10. 2026-07-19 07:52 UTCOSV refresh
  11. 2026-07-19 02:26 UTCEPSS rescore
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  24. 2026-07-11 08:25 UTCEPSS rescore
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  1. 2026-07-09 19:07 UTCEPSS rescore
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  3. 2026-07-06 16:25 UTCEPSS rescore
  4. 2026-07-06 02:21 UTCEPSS rescore
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  6. 2026-07-05 02:28 UTCEPSS rescore
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  8. 2026-07-04 06:29 UTCEPSS rescore
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  10. 2026-07-02 16:57 UTCEPSS rescore
  11. 2026-07-01 15:03 UTCEPSS rescore
  12. 2026-07-01 14:16 UTCOSV refresh
  13. 2026-06-30 23:20 UTCEPSS rescore
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  15. 2026-06-29 14:04 UTCEPSS rescore
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  19. 2026-06-27 03:06 UTCEPSS rescore
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  21. 2026-06-25 13:48 UTCEPSS rescore
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  23. 2026-06-24 14:03 UTCEPSS rescore
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  25. 2026-06-23 21:31 UTCEPSS rescore
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  27. 2026-06-22 14:23 UTCEPSS rescore
  28. 2026-06-21 01:57 UTCEPSS rescore
  29. 2026-06-21 01:57 UTCEPSS rescore
  30. 2026-06-19 19:24 UTCEPSS rescore
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  32. 2026-06-18 17:51 UTCEPSS rescore
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  36. 2026-06-15 17:46 UTCEPSS rescore
  37. 2026-06-14 23:15 UTCEPSS rescore
  38. 2026-06-13 22:58 UTCEPSS rescore
  39. 2026-06-13 22:58 UTCEPSS rescore
  40. 2026-06-13 22:13 UTCOSV refresh
  41. 2026-06-12 23:10 UTCEPSS rescore
  42. 2026-06-12 23:10 UTCEPSS rescore
  43. 2026-06-11 13:58 UTCEPSS rescore
  44. 2026-06-11 13:58 UTCEPSS rescore
  45. 2026-06-10 22:16 UTCEPSS rescore
  46. 2026-06-10 13:20 UTCEPSS rescore
  47. 2026-06-08 14:15 UTCEPSS rescore
  48. 2026-06-07 15:23 UTCEPSS rescore
  49. 2026-06-07 15:23 UTCEPSS rescore
  50. 2026-06-06 13:46 UTCEPSS rescore
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  53. 2026-06-05 22:45 UTCEPSS rescore
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  55. 2026-06-04 13:10 UTCEPSS rescore
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  57. 2026-06-02 20:11 UTCEPSS rescore
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  59. 2026-05-31 22:29 UTCEPSS rescore
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  61. 2026-05-31 00:15 UTCEPSS rescore
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  63. 2026-05-29 13:42 UTCEPSS rescore
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  66. 2026-05-27 13:39 UTCEPSS rescore
  67. 2026-05-27 13:39 UTCEPSS rescore
  68. 2026-05-27 00:48 UTCEG score recompute
  69. 2026-05-27 00:48 UTCVendor advisory
  70. 2026-05-26 13:42 UTCEPSS rescore
  71. 2026-05-26 13:42 UTCEPSS rescore
  72. 2026-05-26 08:16 UTCOSV refresh
  73. 2026-05-26 07:17 UTCEPSS rescore
  74. 2026-05-26 07:17 UTCEPSS rescore

Publicly available exploits

(2 references)

Working exploit code is in the public domain (2 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCrhysemmas/martian-packets
    First seen Jul 17, 2020

    Crafting raw TCP/IP packets to send to poorly configured Kubernetes servers - CVE-2020-8558 PoC

    Open source ↗
  • GitHub PoCtabbysable/POC-2020-8558
    First seen Jul 9, 2020

    Information about Kubernetes CVE-2020-8558, including proof of concept exploit.

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2020-8558?
CVE-2020-8558 is a medium vulnerability published on July 27, 2020. The Kubelet and kube-proxy components in versions 1.1.0-1.16.10, 1.17.0-1.17.6, and 1.18.0-1.18.3 were found to contain a security issue which allows adjacent hosts to reach TCP and UDP services bound to 127.0.0.1 running on the node or in the node's network namespace. Such a service is generally…
When was CVE-2020-8558 disclosed?
CVE-2020-8558 was first published in the National Vulnerability Database on July 27, 2020, 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-2020-8558 actively exploited?
CVE-2020-8558 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 88.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2020-8558?
CVE-2020-8558 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2020-8558?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-8558, 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-2020-8558

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