Vulnerability in HashiCorp Consul (CVE-2021-37219)

Summary

Vulnerability in HashiCorp Consul (CVE-2021-37219). Successful exploitation can lead to full system takeover. Mitigation: upgrade to 1.8.15 or later.

Original description

The description as published by the source.

HashiCorp Consul and Consul Enterprise 1.10.1 Raft RPC layer allows non-server agents with a valid certificate signed by the same CA to access server-only functionality, enabling privilege escalation. Fixed in 1.8.15, 1.9.9 and 1.10.2.

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-2021-37219 has been found in HashiCorp Consul.
Successful exploitation can lead to full system takeover.
What to do: upgrade HashiCorp Consul to 1.8.15 or later.
If unsure, ask your IT team or search "HashiCorp Consul CVE-2021-37219" on the vendor's site.

CVE-2021-37219 (HashiCorp Consul)
Attack vector: remote (network-reachable) / no user interaction
Patched: 1.8.15 — 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 (unclassified) exists in HashiCorp Consul.

📍 Affected scope

Check the vendor advisory for the affected versions of HashiCorp Consul.

🔥 Severity

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

🔧 How to fix

Update to 1.8.15.

🛡️ 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
Identify exposure identify
```
Audit SBOM/dependencies for affected components.
```
資産台帳・SBOM・依存マニフェストで HashiCorp Consul を使っているサービスとバージョンを洗い出す。
2
Apply patch patch
```
Upgrade HashiCorp Consul to 1.8.15
```
ステージング環境で 1.8.15 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
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。

Summary

Original description

Auto-generated summary

Response actions

References