CVE-2020-8559

Privilege escalation from compromised node to cluster

MEDIUM

6.8

CVSS Score

Published: July 22, 2020 at 01:47 PM UTC

Updated: June 17, 2026 at 03:26 AM UTC

1 product affected across 1 vendorKubernetes

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Severity

MEDIUM6.8

Exploit prediction

EPSS 6%

Description

The Kubernetes kube-apiserver in versions v1.6-v1.15, and versions prior to v1.16.13, v1.17.9 and v1.18.6 are vulnerable to an unvalidated redirect on proxied upgrade requests that could allow an attacker to escalate privileges from a node compromise to a full cluster compromise.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Kubernetes · Kubernetes

95%

1.16 ≤ v ≤ 1.16.121.16.0 ≤ v < 1.16.131.17 ≤ v ≤ 1.17.81.17.0 ≤ v < 1.17.91.18 ≤ v ≤ 1.18.51.18.0 ≤ v < 1.18.61.6.0 ≤ v ≤ 1.15.01.10 1.11 1.12 1.13 1.14 1.15 1.16 1.17 1.18 1.6 1.7 1.8 1.9

Affected range stops below 1.16.13, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.17.9, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.18.6, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://github.com/kubernetes/kubernetes/issues/92914

References (3)

x_refsource_MISCExploitIssue TrackingPatchThird Party Advisory

Source: [email protected]

https://github.com/kubernetes/kubernetes/issues/92914

x_refsource_MISCExploitThird Party Advisory

Source: [email protected]

https://groups.google.com/d/msg/kubernetes-security-announce/JAIGG5yNROs/19nHQ5wkBwAJ

x_refsource_CONFIRMThird Party Advisory

Source: [email protected]

https://security.netapp.com/advisory/ntap-20200810-0004/

CVSS

6.8MEDIUM[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: HIGH
User Interaction: REQUIRED
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-601

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