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CVE-2021-34203
high
CVSS 8.1
Vulnerability in dlink (CVE-2021-34203)
Summary
vulnerability in dlink (CVE-2021-34203). Confidential information can be exposed externally.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2021-34203** has been found in dlink.
Confidential information can be exposed externally. CVSS score: 8.1/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "dlink CVE-2021-34203" on the vendor's site.
CVE-2021-34203 (dlink) — CWE-1188 / CVSS v3 8.1
Attack vector: adjacent-network / 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-1188) exists in dlink.
📍 Affected scope
dlink — .
🔥 Severity
Severity: High (CVSS 8.1/10). Confidential information can be exposed externally
🔧 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 'dlink' .` 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 'dlink' . | 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 `dlink` 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
- exploit af854a3a-2127-422b-91ae-364da2661108
- patch af854a3a-2127-422b-91ae-364da2661108
- patch af854a3a-2127-422b-91ae-364da2661108
- web af854a3a-2127-422b-91ae-364da2661108
- web https://nvd.nist.gov/vuln/detail/CVE-2021-34203
- web https://www.dlink.com/en/security-bulletin
- web https://github.com/advisories/GHSA-gr4j-7v97-rrfc