Vulnerability in org.apache.logging.log4j:log4j-core (CVE-2021-44832)

Summary

vulnerability in org.apache.logging.log4j:log4j-core (CVE-2021-44832). Successful exploitation can lead to full system takeover. Mitigation: upgrade to `2.17.1` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **CVE-2021-44832** has been found in org.apache.logging.log4j:log4j-core. Successful exploitation can lead to full system takeover. CVSS score: 6.6/10. What to do: upgrade org.apache.logging.log4j:log4j-core to **2.17.1** or later. If unsure, ask your IT team or search "org.apache.logging.log4j:log4j-core CVE-2021-44832" on the vendor's site.

CVE-2021-44832 (org.apache.logging.log4j:log4j-core) — CWE-20 / CVSS v3 6.6 Attack vector: remote (network-reachable) / no user interaction Patched: `2.17.1` — 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

**A vulnerability** (CWE-20) exists in org.apache.logging.log4j:log4j-core.

📍 Affected scope

org.apache.logging.log4j:log4j-core — .

🔥 Severity

Severity: Medium (CVSS 6.6/10). Successful exploitation can lead to full system takeover

🔧 How to fix

Update to **2.17.1**.

🛡️ 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. Run `grep -r 'org.apache.logging.log4j:log4j-core' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response Actions (7 steps)

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

1
Identify exposure identify
```
grep -r 'org.apache.logging.log4j:log4j-core' . | grep -v node_modules
```
リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で `org.apache.logging.log4j:log4j-core` を grep し、稼働しているサービス・バージョンを把握する。
6
Apply patch patch
```
Upgrade org.apache.logging.log4j:log4j-core to 2.17.1
```
ステージング環境で 2.17.1 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と、Step 3 で見つけた異常検知の続報チェックを含めること。
7
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 Step 3 と同じログクエリでアラート再発が無いか継続監視。

Affected packages

maven org.apache.logging.log4j:log4j-core

[{"type":"ECOSYSTEM","events":[{"introduced":"2.13.0"},{"fixed":"2.17.1"}]}]

maven org.ops4j.pax.logging:pax-logging-log4j2

[{"type":"ECOSYSTEM","events":[{"introduced":"2.0.0"},{"fixed":"2.0.14"}]}]

Vulnerability in org.apache.logging.log4j:log4j-core (CVE-2021-44832)

Summary

AI summary snake-internal / snake-material-v2

Response Actions (7 steps)

Affected packages

References

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