5.5

CVE-2020-8557: Kubernetes node disk Denial of Service by writing to container /etc/hosts

Modified
AliasesSUSE-RU-2020:2204-1RHSA-2021:3915UBUNTU-CVE-2020-8557
Published 23-07-2020Last modified 17-09-2024

Vulnerability summary

CVE-2020-8557 is a medium (CVSS 5.5) Uncontrolled Resource Consumption vulnerability in kubernetes. EPSS estimates a 0.43% chance of exploitation in the next 30 days, higher than 37.7% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.43%
0%100%
Low · -0.07 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 4 · Related 1
OPENSUSE-SU-2025:15424-1RHSA-2020:3519RHSA-2020:3579RHSA-2020:3808

Timeline

  1. 23-07-2020
    PublishedVulnerability first disclosed.
  2. 17-09-2024
    Last modifiedVulnerability information updated.

Description

The Kubernetes kubelet component in versions 1.1-1.16.12, 1.17.0-1.17.8 and 1.18.0-1.18.5 do not account for disk usage by a pod which writes to its own /etc/hosts file. The /etc/hosts file mounted in a pod by kubelet is not included by the kubelet eviction manager when calculating ephemeral storage usage by a pod. If a pod writes a large amount of data to the /etc/hosts file, it could fill the storage space of the node and cause the node to fail.

CVSS metrics

8 scores · 7 sources · 2 versions

EPSS trend

Probability

0.43%

Chance of exploitation in the next 30 days

Percentile

38%

Versus all other CVEs

30-day change

Decrease -0.07 pp

From 0.50% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Redhat13 products
  • atomic-openshift< 0:3.11.542-1.git.0.f2fd300.el7
  • atomic-openshift-clients< 0:3.11.542-1.git.0.f2fd300.el7
  • atomic-openshift-clients-redistributable< 0:3.11.542-1.git.0.f2fd300.el7
  • atomic-openshift-docker-excluder< 0:3.11.542-1.git.0.f2fd300.el7
  • atomic-openshift-excluder< 0:3.11.542-1.git.0.f2fd300.el7
Alpine1 product
  • k3s< 1.18.6.1-r0
Debian1 product
  • kubernetes< 1.18.5-1
K8s.io1 product
  • kubernetes≥ 1.18.0, < 1.18.6
K8s.io/kubernetes/pkg1 product
  • kubelet≥ 1.1.0, < 1.16.13 | ≥ 1.17.0, < 1.17.9 | ≥ 1.18.0, < 1.18.6
Kubernetes1 product
  • kubernetes1.15 | 1.14 | 1.13 | 1.12 | 1.11 | 1.10 | 1.9 | 1.8 | 1.7 | 1.6 | 1.5 | 1.4 | 1.3 | 1.2 | 1.1 | ≥ 1.18, < 1.18.6 | ≥ 1.17, < 1.17.9 | ≥ 1.16, < 1.16.13 | < 1.16.13 | ≥ 1.17.0, < 1.17.9 | ≥ 1.18.0, < 1.18.6
Suse1 product
  • kubernetes&distro=SUSE Linux Enterprise Module for Containers 15 SP1< 1.17.4-4.18.1
Ubuntu1 product
  • kubernetesAll versions (No fix recorded)

8 vendors · 20 products

References

35 links
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