Skip to main content

CISA and NSA Release Guidance for Exchange Server Security

Source Decision Insights Threat Desk Published November 6, 2025 Companies 5
Human View Machine View

5 companies named across 5 categories, one of 131 articles referencing Microsoft. Previous coverage: CISA includes two new vulnerabilities in KEV Catalog (Nov 2025).

Companies mentioned

Best suited for

Persona
Security Operations Leader
Decision stage
Which to buy
Adoption curve
Late Majority

Our classification, not the publisher's statement. Best suited for, not only for.

Today, CISA, in partnership with the National Security Agency and international cybersecurity partners, released Microsoft Exchange Server Security Best Practices, a guide to help network defenders harden on-premises (on-prem) Exchange servers against exploitation by malicious actors.

Threat activity targeting Exchange continues to persist, and organizations with unprotected or misconfigured Exchange servers remain at high risk of compromise. 

Best practices in this guide focus on hardening user authentication and access, ensuring strong network encryption, and minimizing application attack surfaces. CISA recommends organizations also decommission any remaining end-of-life on-prem or hybrid Exchange servers after transitioning to Microsoft 365, as retaining the “last Exchange server” can expose organizations to ongoing exploitation activity. 

CISA recommends organizations implement Microsoft Exchange Server Best Practices and take steps to decommission end-of-life on-prem Exchange servers in hybrid environments to significantly reduce their risk from cyber threats. 

Blog post, originally published by CISA at cisa.gov.

Mentions

Structured data (JSON-LD)

The schema.org markup this page publishes for search engines and AI agents, exactly as they read it.

[
  {
    "@context": "https://schema.org",
    "@id": "https://decisioninsights.ai/#website",
    "@type": "WebSite",
    "name": "Decision Insights",
    "potentialAction": {
      "@type": "SearchAction",
      "target": {
        "@type": "EntryPoint",
        "urlTemplate": "https://decisioninsights.ai/search/?q={search_term_string}&submit=1"
      }
    },
    "publisher": {
      "@id": "https://decisioninsights.ai/#organization"
    },
    "url": "https://decisioninsights.ai"
  },
  {
    "@context": "https://schema.org",
    "@id": "https://decisioninsights.ai/#organization",
    "@type": "Organization",
    "contactPoint": {
      "@type": "ContactPoint",
      "contactType": "customer support",
      "email": "[email protected]"
    },
    "description": "Decision Insights is a Registry of technology companies, open source projects, and industry terms, built for people and for AI agents that need sourced, structured information.",
    "logo": {
      "@type": "ImageObject",
      "url": "https://wiretap-cdn-assets.nyc3.cdn.digitaloceanspaces.com/decision-insights/[email protected]"
    },
    "name": "Decision Insights",
    "parentOrganization": {
      "@type": "Organization",
      "name": "Wiretap Labs",
      "sameAs": [
        "https://www.linkedin.com/company/wiretap-labs",
        "https://www.crunchbase.com/organization/wiretap-labs"
      ],
      "url": "https://wiretaplabs.com"
    },
    "publishingPrinciples": "https://decisioninsights.ai/standards/",
    "sameAs": [
      "https://www.linkedin.com/company/decisioninsights"
    ],
    "url": "https://decisioninsights.ai"
  },
  {
    "@context": "https://schema.org",
    "@type": "BreadcrumbList",
    "itemListElement": [
      {
        "@type": "ListItem",
        "item": "https://decisioninsights.ai",
        "name": "Decision Insights",
        "position": 1
      },
      {
        "@type": "ListItem",
        "item": "https://decisioninsights.ai/records/",
        "name": "Records",
        "position": 2
      },
      {
        "@type": "ListItem",
        "item": "https://decisioninsights.ai/cisa-and-nsa-release-guidance-for-exchange-server-security/",
        "name": "CISA and NSA Release Guidance for Exchange Server Security",
        "position": 3
      }
    ]
  },
  {
    "@context": "https://schema.org",
    "@id": "https://decisioninsights.ai/cisa-and-nsa-release-guidance-for-exchange-server-security/#blogposting",
    "@type": "BlogPosting",
    "about": {
      "@id": "https://decisioninsights.ai/registry/department-of-homeland-security/#organization",
      "@type": "Organization",
      "mainEntityOfPage": "https://decisioninsights.ai/registry/department-of-homeland-security/",
      "name": "Department of Homeland Security"
    },
    "articleSection": [
      "Cybersecurity",
      "Data Center"
    ],
    "audience": [
      {
        "@type": "Audience",
        "additionalType": "Persona",
        "audienceType": "Security Operations Leader"
      },
      {
        "@type": "Audience",
        "additionalType": "Adoption curve",
        "audienceType": "Late Majority"
      }
    ],
    "author": {
      "@id": "https://decisioninsights.ai/author/decision-insights-threat-desk/#person",
      "@type": "Person",
      "name": "Decision Insights Threat Desk",
      "url": "https://decisioninsights.ai/author/decision-insights-threat-desk/"
    },
    "dateModified": "2026-08-23T13:14:57-06:00",
    "datePublished": "2025-11-06T16:56:23-07:00",
    "description": "CISA outlines Microsoft Exchange Server Security Best Practices, highlighting measures to protect against cyber threats.",
    "headline": "CISA and NSA Release Guidance for Exchange Server Security",
    "isBasedOn": {
      "@type": "CreativeWork",
      "author": {
        "@type": "Person",
        "name": "CISA"
      },
      "sourceOrganization": {
        "@id": "https://decisioninsights.ai/registry/department-of-homeland-security/#organization",
        "@type": "Organization",
        "mainEntityOfPage": "https://decisioninsights.ai/registry/department-of-homeland-security/",
        "name": "Department of Homeland Security"
      },
      "url": "https://www.cisa.gov/news-events/alerts/2025/10/30/new-guidance-released-microsoft-exchange-server-security-best-practices"
    },
    "keywords": [
      "on-premises",
      "Server",
      "Threats"
    ],
    "mainEntityOfPage": {
      "@id": "https://decisioninsights.ai/cisa-and-nsa-release-guidance-for-exchange-server-security/",
      "@type": "WebPage",
      "sdDatePublished": "2026-08-23",
      "sdPublisher": {
        "@id": "https://decisioninsights.ai/#organization"
      }
    },
    "mentions": [
      {
        "@id": "https://decisioninsights.ai/registry/365/#organization",
        "@type": "Organization",
        "mainEntityOfPage": "https://decisioninsights.ai/registry/365/",
        "name": "365"
      },
      {
        "@id": "https://decisioninsights.ai/registry/department-of-homeland-security/cybersecurity-and-infrastructure-security-agency-cisa/#organization",
        "@type": "Organization",
        "mainEntityOfPage": "https://decisioninsights.ai/registry/department-of-homeland-security/cybersecurity-and-infrastructure-security-agency-cisa/",
        "name": "Cybersecurity and Infrastructure Security Agency (CISA)"
      },
      {
        "@id": "https://decisioninsights.ai/registry/department-of-homeland-security/#organization",
        "@type": "Organization",
        "mainEntityOfPage": "https://decisioninsights.ai/registry/department-of-homeland-security/",
        "name": "Department of Homeland Security"
      },
      {
        "@id": "https://decisioninsights.ai/registry/microsoft/#organization",
        "@type": "Organization",
        "mainEntityOfPage": "https://decisioninsights.ai/registry/microsoft/",
        "name": "Microsoft"
      },
      {
        "@id": "https://decisioninsights.ai/registry/u.s.-department-of-defense/national-security-agency/#organization",
        "@type": "Organization",
        "mainEntityOfPage": "https://decisioninsights.ai/registry/u.s.-department-of-defense/national-security-agency/",
        "name": "National Security Agency (NSA)"
      }
    ],
    "publisher": {
      "@id": "https://decisioninsights.ai/#organization"
    }
  },
  {
    "@context": "https://schema.org",
    "@id": "https://decisioninsights.ai/author/decision-insights-threat-desk/#person",
    "@type": "Person",
    "description": "CISA advisories, vendor security bulletins, and CVE disclosures, summarized into sourced briefs. Produced under our Standards & Methodology.",
    "name": "Decision Insights Threat Desk",
    "sameAs": [
      "https://www.linkedin.com/showcase/decisioninsights/"
    ],
    "url": "https://decisioninsights.ai/author/decision-insights-threat-desk/"
  }
]

Is this your company? Get structured data for your own pages