Home Page | CISA Official websites use .gov .gov website belongs to an official government organization in the United States. Secure .gov websites use HTTPS lock ) or means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites. Countdown to America's 250th Anniversary! 2026-07-04 Days Hours Minutes Due to the lapse in federal funding, this website will not be actively managed. no-cost Cyber Services Secure by design Secure Your Business Shields Up Report A Cyber Issue Share: CISA, NCSC-UK and Partners Release Cybersecurity Advisory on Chinese Government-Linked Covert Networks This advisory provides network defenders with tools to defend against cyber actors using large-scale networks of compromised devices to conduct malicious cyber activity. Read the Advisory JOINT CYBERSECURITY ADVISORY WARNS OF IRANIAN-AFFILIATED CYBER ACTORS TARGETING US CRITICAL INFRASTRUCTURE CISA and partners caution U.S. organizations of ongoing cyber exploitation targeting internet-connected operational technology devices across multiple critical infrastructure sectors. Read the Advisory PUBLIC SERVICE ANNOUNCEMENT WARNS AGAINST PHISHING ATTEMPTS TARGETING COMMERCIAL MESSAGING APPS CISA and the FBI have released a Public Service Announcement warning against state cyber actors targeting commercial messaging apps. Read More for Guidance CISA URGES ENDPOINT MANAGEMENT SYSTEMS HARDENING AFTER CYBERATTACK AGAINST US ORGANIZATION CISA urges organizations to check endpoint management system configurations after a recent cyberattack targeting a U.S. corporation. Read the Alert EMERGENCY DIRECTIVE TO ADDRESS VULNERABILITIES IN CISCO SYSTEMS CISA’s Emergency Directive 26-03 calls on federal agencies to inventory SD-WAN systems, apply mitigations, and assess for compromise based on CVE-2026-20127 and CVE-2022-20775. Read more for guidance Enhanced Vulnerability Management with OpenEoX By embracing OpenEoX, we as a collective community can proactively eliminate vulnerabilities, safeguard the digital ecosystem at scale, and counter the ever-increasing exploitation speed of threat actors. Read the Blog News Updates Apr 23, 2026 Press Release CISA, National Cyber Security Centre (NCSC) UK, and Global Partners Issue Advisory on Chinese Government-Linked Covert Cyber Networks Feb 26, 2026 Press Release CISA Issues Updated RESURGE Malware Analysis Highlighting a Stealthy but Active Threat Feb 25, 2026 Press Release Immediate Action Required: CISA Issues Emergency Directive to Secure Cisco SD-WAN Systems Feb 13, 2026 Blog The End is Just the Beginning of Better Security: Enhanced Vulnerability Management with OpenEoX Feb 13, 2026 Press Release CISA Announces New Town Halls to Engage with Stakeholders on Cyber Incident Reporting for Critical Infrastructure View More News Latest Operational Information Apr 23, 2026 Cybersecurity Advisory | AA26-113A Defending Against China-Nexus Covert Networks of Compromised Devices Apr 22, 2026 Alert CISA Adds One Known Exploited Vulnerability to Catalog Apr 21, 2026 ICS Advisory | ICSA-26-111-02 Siemens RUGGEDCOM CROSSBOW Secure Access Manager Primary Apr 21, 2026 ICS Advisory | ICSA-26-111-04 Siemens Analytics Toolkit Apr 21, 2026 ICS Advisory | ICSA-26-111-03 Siemens SINEC NMS View All Alerts & Advisories Subscribe to Updates How can we help? All Audiences Find Help Locally Contact your Region Assist Visits Protected Critical Infrastructure Information Industry Secure by Design Information Sharing: A Vital Resource PCII Program modernized Joint Cyber Defense Collaborative expands Small and Medium Businesses Cyber guidance for small businesses Supplementing passwords Doing business with CISA Educational Institutions School Safety Cybersecurity for K-12 K-12 School Security Product Suite Protecting Our Future: Partnering to Safeguard K-12 Organizations from Cybersecurity Threats All Audiences JCDC unifies cyber defenders from organizations worldwide. This team proactively gathers, analyzes, and shares actionable cyber risk information to enable synchronized, holistic cybersecurity planning, cyber defense, and response. JCDC StopRansomware.gov is the U.S. Government's official one-stop location for resources to tackle ransomware more effectively. STOPRANSOMWARE SAFECOM works to improve emergency communications interoperability across local, regional, tribal, state, territorial, international borders, and with federal government entities. SAFECOM Additional CISA Resources CISA Resources & Tools CISA offers an array of free resources and tools, such as technical assistance, exercises, cybersecurity assessments, free training, and more. CISA Events CISA hosts and participates in events throughout the year to engage stakeholders, seek research partners, and communicate with the public to help protect the homeland. CISA Services Catalog A single resource that provides you with access to information on services across CISA’s mission areas. CISA Training As part of our continuing mission to reduce cybersecurity and physical security risk, CISA provides a robust offering of cybersecurity and critical infrastructure training opportunities.