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Pro-Russia Hacktivists Conduct Opportunistic Attacks Against US and Global Critical Infrastructure
Summary Note: This joint Cybersecurity Advisory is being published as an addition to the Cybersecurity and Infrastructure Security Agency (CISA) May 6, 2025, joint fact sheet Primary Mitigations to Reduce Cyber Threats to Operational Technology
Countering Chinese State-Sponsored Actors Compromise of Networks Worldwide to Feed Global Espionage System
Executive summary People’s Republic of China (PRC) state-sponsored cyber threat actors are targeting networks globally, including, but not limited to, telecommunications, government, transportation, lodging, and military infrastructure networks. While these actors focus on large backbone
CISA Shares Lessons Learned from an Incident Response Engagement
Advisory at a Glance Executive Summary CISA began incident response efforts at a U.S. federal civilian executive branch (FCEB) agency following the detection of potential malicious activity identified through security alerts generated by the agency’s
CISA Releases Thirty-Two Industrial Control Systems Advisories
CISA released thirty-two Industrial Control Systems (ICS) advisories on August 14, 2025. These advisories provide timely information about current security issues, vulnerabilities, and exploits surrounding ICS. ICSA-25-226-01 Siemens SIMATIC RTLS Locating Manager ICSA-25-226-02 Siemens COMOS ICSA-25-226-03 Siemens Engineering
CISA and Partners Release Asset Inventory Guidance for Operational Technology Owners and Operators
CISA, along with the National Security Agency, the Federal Bureau of Investigation, Environmental Protection Agency, and several international partners, released comprehensive guidance to help operational technology (OT) owners and operators across all critical infrastructure sectors
CISA Issues ED 25-02: Mitigate Microsoft Exchange Vulnerability
Today, CISA issued Emergency Directive (ED) 25-02: Mitigate Microsoft Exchange Vulnerability in response to CVE-2025-53786, a vulnerability in Microsoft Exchange server hybrid deployments. ED 25-02 directs all Federal Civilian Executive Branch (FCEB) agencies with
Microsoft Releases Guidance on High-Severity Vulnerability (CVE-2025-53786) in Hybrid Exchange Deployments
Note: This Alert may be updated to reflect new guidance issued by CISA or other parties. CISA is aware of the newly disclosed high-severity vulnerability, CVE-2025-53786, that allows a cyber threat actor with administrative access to
CISA Releases Malware Analysis Report Associated with Microsoft SharePoint Vulnerabilities
CISA published a Malware Analysis Report (MAR) with analysis and associated detection signatures on files related to Microsoft SharePoint vulnerabilities: CVE-2025-49704 [CWE-94: Code Injection], CVE-2025-49706 [CWE-287: Improper Authentication], CVE-2025-53770 [CWE-502: Deserialization of Untrusted Data], and
MAR-251132.c1.v1 Exploitation of SharePoint Vulnerabilities
Notification This report is provided "as is" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained herein. The DHS does not endorse