CVE-2020-26278

Host takeover via shared PID namespace

Published Jan 20, 2021 · Updated Aug 4, 2024

Improper privilege management in Weave Net before 2.8.0 allows attackers with pod code execution to take over Kubernetes hosts. The supplied DaemonSet unnecessarily places privileged networking pods in the host PID namespace and mounts host paths, exposing host processes and writable root-filesystem locations. Exploitation requires a separate flaw or misconfiguration that grants code execution inside a Weave Net pod; the resulting access permits control of any cluster host.

CVSS severity5.8
Medium
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper privilege management in Weave Net before 2.8.0 allows attackers with pod code execution to take over Kubernetes hosts. The supplied DaemonSet unnecessarily places privileged networking pods in the host PID namespace and mounts host paths, exposing host processes and writable root-filesystem locations. Exploitation requires a separate flaw or misconfiguration that grants code execution inside a Weave Net pod; the resulting access permits control of any cluster host.

The record

CVE
CVE-2020-26278
Published
Jan 20, 2021
Updated
Aug 4, 2024
Vendor
Weaveworks
Product
Weave Net
Classifications
CWE-250, T1611
Attack vector
adjacent
Privileges
Unavailable

Timeline

How it unfolded

  1. Jan 20, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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=< 2.8.0

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesUnavailable in this record.

What is affected?

Weaveworks · Weave Netversion=< 2.8.0

Published CVSS scores

7.9NISTAV:A/AC:M/Au:N/C:C/I:C/A:C
8.0NISTCVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
5.8GitHubCVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-250Execution with Unnecessary Privileges
T1611Escape to Host

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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