← Back
CVE-2021-38163
CISA KEV
high
[KEV] Vulnerability in Sap netweaver (CVE-2021-38163)
Summary
vulnerability in Sap netweaver (CVE-2021-38163). Risk of unauthorized operations or information disclosure. Listed in CISA KEV — actively exploited.
AI summary snake-internal / snake-template-v1
A weakness called CVE-2021-38163 was discovered in Sap Netweaver.
Severity is High. If exploited, attackers can leak data or disrupt key functionality.
Note: CISA has officially listed this as actively exploited in the wild. Treat it with higher urgency than usual.
What you should do: update the affected software to the latest version. If unsure, ask your IT team or search the vendor's site for "Sap CVE-2021-38163".
CVE-2021-38163 (Sap Netweaver). Severity: High. Category: CWE-23.
Listed in CISA KEV — actively exploited in the wild. Patch as a top priority.
Response plan:
1. Check the vendor advisory for affected versions and the patched release.
2. If a vulnerable version is running in production, schedule maintenance (urgency from KEV/CVSS).
3. If no patch yet, mitigate via WAF rule, disabling the affected feature, etc.
4. Monitor logs / SIEM for known IOC and PoC signatures of this CVE.
PoCs and fix commits: see the 'References' section, MITRE, and NVD.
❓ What is the problem
A weakness (CVE-2021-38163) in Sap Netweaver. A serious software flaw has been identified.
📍 Affected scope
Target versions of Sap Netweaver (see vendor advisory). If running in production, identify exposure immediately.
🔥 Severity
Severity: High. If exploited, attackers can leak data or disrupt key functionality. Listed in CISA KEV (confirmed exploitation in the wild).
🔧 How to fix
Update to the patched release as listed in the vendor advisory. (Typical mitigation pattern for CWE-23)
🛡️ Workaround
If a patch is not yet available, consider disabling the affected feature, applying WAF rules, blocking via network ACLs, or isolating the vulnerable version.
🔍 Detection
Check version information, scan dependencies via SBOM, and monitor SIEM for IOC and PoC signatures related to this CVE.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'netweaver' . | 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 `netweaver` を grep し、稼働しているサービス・バージョンを把握する。
-
4Consider incident declaration escalate
Notify SOC / on-callCISA KEV登録済 = 実環境で悪用が観測されている。Step 3 で兆候があればインシデント対応宣言、無くてもパッチ適用までWAF強化を最優先で。
-
7Post-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。
References
- advisory NVD