CVE-2025-53355Public exploitNetwork attack vector

Code execution via unsanitized shell command arguments

Published Jul 8, 2025 · Updated Jul 9, 2025

Command injection in Flux159 MCP Server Kubernetes before 2.5.0 allows remote attackers to execute code through crafted tool arguments. The kubectl_scale and related tools interpolate client-controlled values into shell command strings passed to child_process.execSync without neutralizing shell metacharacters. Exploitation requires a vulnerable tool call, either directly or after an MCP client follows attacker-controlled instructions, and runs commands with the server process's privileges.

CVSS severity7.5
High
EPSS probability2.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in Flux159 MCP Server Kubernetes before 2.5.0 allows remote attackers to execute code through crafted tool arguments. The kubectl_scale and related tools interpolate client-controlled values into shell command strings passed to child_process.execSync without neutralizing shell metacharacters. Exploitation requires a vulnerable tool call, either directly or after an MCP client follows attacker-controlled instructions, and runs commands with the server process's privileges.

The record

CVE
CVE-2025-53355
Published
Jul 8, 2025
Updated
Jul 9, 2025
Vendor
Flux159
Product
MCP Server Kubernetes
Classifications
CWE-77, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 8, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2025Record 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=< 2.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Flux159 · MCP Server Kubernetesversion=< 2.5.0

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

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 exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059.004Unix Shell

Public exploit references

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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