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CVE-2021-4105
critical
CVSS 9.8
Vulnerability in bg-tek (CVE-2021-4105)
Summary
vulnerability in bg-tek (CVE-2021-4105). Successful exploitation can lead to full system takeover.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2021-4105** has been found in bg-tek.
Successful exploitation can lead to full system takeover. CVSS score: 9.8/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "bg-tek CVE-2021-4105" on the vendor's site.
CVE-2021-4105 (bg-tek) — CWE-755 / CVSS v3 9.8
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
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-755) exists in bg-tek.
📍 Affected scope
bg-tek — .
🔥 Severity
Severity: Critical (CVSS 9.8/10). Successful exploitation can lead to full system takeover
🔧 How to fix
Update to the patched release per vendor advisory.
🛡️ 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 'bg-tek' .` 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
-
1Identify exposure identify
grep -r 'bg-tek' . | 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 `bg-tek` を grep し、稼働しているサービス・バージョンを把握する。
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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
- web http://blog.coslat.com/2021/07/onemli-kritik-guncelleme-2021-07-27.html
- web https://siberguvenlik.gov.tr/guvenlik-bildirimleri/detay/tr-23-0108
- web https://www.usom.gov.tr/bildirim/tr-23-0108
- web https://nvd.nist.gov/vuln/detail/CVE-2021-4105
- web https://github.com/advisories/GHSA-gr7g-5rvj-cf96