CVE-2020-8570Network attack vector

Arbitrary file overwrite via unsafe tar extraction

Published Jan 21, 2021 · Updated Sep 16, 2024

Path traversal in Kubernetes Java Client before 9.0.2 or 10.0.1 allows remote attackers to overwrite files via malicious pod archives. Copy.java extracts tar entries from a remote pod without constraining entry paths to the requested destination, allowing traversal outside the current directory. Exploitation requires an application to use Copy against an untrusted pod, and impact is limited to files writable by the client process.

CVSS severity9.1
Critical
EPSS probability3.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Kubernetes Java Client before 9.0.2 or 10.0.1 allows remote attackers to overwrite files via malicious pod archives. Copy.java extracts tar entries from a remote pod without constraining entry paths to the requested destination, allowing traversal outside the current directory. Exploitation requires an application to use Copy against an untrusted pod, and impact is limited to files writable by the client process.

The record

CVE
CVE-2020-8570
Published
Jan 21, 2021
Updated
Sep 16, 2024
Vendor
Kubernetes
Product
Kubernetes Java Client
Classifications
CWE-23, CWE-22, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 21, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0 <10.0.1
  2. Affected versionversion=9.0 <9.0.2
  3. Affected versionversion=all versions prior to 9.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Kubernetes · Kubernetes Java Clientversion=10.0 <10.0.1; version=9.0 <9.0.2; version=all versions prior to 9.0

Published CVSS scores

9.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
6.4NVDAV:N/AC:L/Au:N/C:N/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-23Relative Path Traversal
CWE-22Improper Limitation of a Pathname to a Restricted Directory
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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