Vulnerability in microsoft (CVE-2025-64666, CVSS 7.5)

Summary

vulnerability in microsoft (CVE-2025-64666). Successful exploitation can lead to full system takeover.

Original description

The description as published by the source.

Improper input validation in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

Source: NIST National Vulnerability Database NVD

AI summary

Written by an external AI model and may contain mistakes. Check the original description and references below before acting on it.

A vulnerability tracked as CVE-2025-64666 has been found in microsoft.
Successful exploitation can lead to full system takeover. CVSS score: 7.5/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "microsoft CVE-2025-64666" on the vendor's site.

CVE-2025-64666 (microsoft) — CWE-20 / CVSS v3 7.5
Attack vector: remote (network-reachable) / 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

Microsoft Exchange Serverにおける不適切な入力検証が原因です。

📍 Affected scope

Microsoft Exchange Server

🔥 Severity

認可された攻撃者がネットワークを介して権限を昇格できるため、深刻な影響を与える可能性があります。

🔧 How to fix

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-64666 にアクセスし、対応するパッチをインストールしてください。

🛡️ Workaround

情報なし

🔍 Detection

情報なし

Response actions

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

1
Identify exposure identify
```
grep -r 'microsoft' . | 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 microsoft を grep し、稼働しているサービス・バージョンを把握する。
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。

References

patch secure@microsoft.com