CVE-2022-21951Network attack vector

Cluster traffic exposure and tampering via omitted password

Published May 25, 2022 · Updated Sep 16, 2024

Cleartext transmission in Rancher 2.5.0 through 2.5.13 and 2.6.0 through 2.6.4 allows attackers to read and change cluster traffic. The RKE-template UI omits a Weave password when Weave is selected as the CNI, so the created cluster sends network traffic without encryption. Exposure requires a cluster created from an RKE template with Weave selected; clusters created without a template are unaffected.

CVSS severity6.8
Medium
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cleartext transmission in Rancher 2.5.0 through 2.5.13 and 2.6.0 through 2.6.4 allows attackers to read and change cluster traffic. The RKE-template UI omits a Weave password when Weave is selected as the CNI, so the created cluster sends network traffic without encryption. Exposure requires a cluster created from an RKE template with Weave selected; clusters created without a template are unaffected.

The record

CVE
CVE-2022-21951
Published
May 25, 2022
Updated
Sep 16, 2024
Vendor
NeuVector
Product
Rancher
Classifications
CWE-319, T1040
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 25, 2022CVE 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=Rancher <2.5.14
  2. Affected versionversion=Rancher <2.6.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

NeuVector · Rancherversion=Rancher <2.5.14; version=Rancher <2.6.5

Published CVSS scores

6.8NVDCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
6.8SUSECVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
3.6NVDAV:N/AC:H/Au:S/C:P/I:P/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-319Cleartext Transmission of Sensitive Information
T1040Network Sniffing

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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