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Archived: 2026-04-23 14:28
Home Page | CISA
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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.
Skip to main content
Official websites use .gov
A
.gov
website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A
lock
(
) or
https://
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
0
Days
0
Hours
0
Minutes
Due to the lapse in federal funding, this website will not be actively managed.
Read More
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.