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CVE-2021-4178

Unsafe Deserialization in io.fabric8:kubernetes-client (CVE-2021-4178)

Summary

Vulnerability in io.fabric8:kubernetes-client (CVE-2021-4178). Successful exploitation can lead to full system takeover. Mitigation: upgrade to 5.11.2 or later.

Original description

The description as published by the source.

fabric8 Kubernetes client had an arbitrary code execution flaw in versions 5.0.0-beta-1 and higher. Attackers could potentially insert malicious YAMLs due to misconfigured YAML parsing.

Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2021-4178 has been found in io.fabric8:kubernetes-client.
Successful exploitation can lead to full system takeover.
What to do: upgrade io.fabric8:kubernetes-client to 5.11.2 or later.
If unsure, ask your IT team or search "io.fabric8:kubernetes-client CVE-2021-4178" on the vendor's site.

CVE-2021-4178 (io.fabric8:kubernetes-client) — CWE-502
Attack vector: local / no user interaction
Patched: 5.11.2 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

Unsafe deserialization (CWE-502) exists in io.fabric8:kubernetes-client.

📍 Affected scope

Check the vendor advisory for the affected versions of io.fabric8:kubernetes-client.

🔥 Severity

Severity: ?. Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to 5.11.2.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    Audit SBOM/dependencies for affected components.

    資産台帳・SBOM・依存マニフェストで io.fabric8:kubernetes-client を使っているサービスとバージョンを洗い出す。

  2. 2
    Apply patch patch 
    Upgrade io.fabric8:kubernetes-client to 5.11.2

    ステージング環境で 5.11.2 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

Maven io.fabric8:kubernetes-client
[{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.11.2"}]}]

References

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