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Countering Chinese State-Sponsored Actors Compromise of Networks Worldwide to Feed Global Espionage System   Advisory

Aug 28, 2025 - This joint cyber security advisory gives vital insights on People’s Republic of China (PRC) state-sponsored cyber threat actors, how they gain and maintain persistent access, and the capabilities they have. It provides threat hunting guidance and mitigation strategies to help safeguard your networks.

Mitigating Log4Shell and Other Log4j-Related Vulnerabilities   Advisory

Dec 23, 2021 - Malicious cyber actors are actively scanning networks to potentially exploit Log4Shell, CVE-2021-45046, and CVE-2021-45105 in vulnerable systems. According to public reporting, Log4Shell and CVE-2021-45046 are being actively exploited. This joint Cybersecurity Advisory is to provide mitigation guidance on addressing vulnerabilities.

2023 top routinely exploited vulnerabilities   Advisory

Nov 13, 2024 - This advisory provides details, collected and compiled by the authoring agencies, on the Common Vulnerabilities and Exposures (CVEs) routinely and frequently exploited by malicious cyber actors in 2023 and their associated Common Weakness Enumerations (CWEs). Malicious cyber actors exploited more zero-day vulnerabilities to compromise enterprise networks in 2023 compared to 2022, allowing them to conduct operations against high priority targets.
The authoring agencies strongly encourage vendors, designers, developers, and end-user organizations to implement the following recommendations, and those found within the Mitigations section of this advisory, to reduce the risk of compromise by malicious cyber actors.

HPE Aruba Networking Virtual Intranet Access client (VIA)  

Jul 23, 2024 - Aruba Virtual Intranet Access

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Learn about who we are and what we do.

Hardening Microsoft Windows 10 workstations   Publication

Sep 4, 2025 - This publication provides recommendations on hardening workstations using Enterprise and Education editions of Microsoft Windows 10. While this publication refers to workstations, most recommendations are equally applicable to servers (with the exception of Domain Controllers) using Microsoft Windows Server. Security features discussed in this publication, along with the names and locations of Group Policy settings, are taken from Microsoft Windows 10 version 22H2.

Archived Alerts and Advisories  

Jan 23, 2025 - Search archived cyber security alerts and advice

Hardening Microsoft Windows 11 workstations   Publication

Sep 4, 2025 - This publication provides recommendations on hardening workstations using Enterprise and Education editions of Microsoft Windows 11. While this publication refers to workstations, most recommendations are equally applicable to servers (with the exception of Domain Controllers) using Microsoft Windows Server. Security features discussed in this publication, along with the names and locations of Group Policy settings, are taken from Microsoft Windows 11 version 24H2.

BADBAZAAR and MOONSHINE: Technical analysis and mitigations   Advisory

Apr 9, 2025 - This guidance has been jointly produced by government agencies from the UK, Australia, Canada, Germany, New Zealand, and the US and is supported by members of the NCSC Cyber League. Its provides new and collated threat intelligence on two spywares known as MOONSHINE and BADBAZAAR with guidance for how App store operators, developers and social media companies can keep their users safe.

Turn on multi-factor authentication  

Nov 9, 2022 - Protect your important accounts with extra login steps.

Managing the risks of legacy IT: Practitioner guidance   Publication

Jun 12, 2024 - This publication provides guidance for practitioners on managing the risks posed by legacy IT and outlines low-cost mitigations that organisations can draw upon.

Security tips for travelling   Guidance

Jul 29, 2024 - Learn how to stay secure while travelling with personal devices.

Domain Name System security for domain owners   Publication

Oct 6, 2021 - This publication provides information on DNS security for domain owners. It also shared helpful strategies to reduce the risk of domain misuse.

Essential Eight maturity model FAQ   Publication

Oct 28, 2024 - This publication provides answers to frequency asked questions on how to implement the Essential Eight.

Protect yourself from scams  

Feb 3, 2025 - Protect your accounts by recognising and reporting scams.

Managing cryptographic keys and secrets   Publication

Aug 26, 2025 - This guide has been developed to help organisational personnel in understanding the threat environment and the value of implementing secure keys and secrets management to make better informed decisions.

2020 Health Sector Snapshot   Reports and statistics

Feb 22, 2021 - This Sector Snapshot is designed to enhance awareness of key cyber security threats in the health sector and advise executives and cyber security professionals within the health sector on what they can do to protect their organisation from cyber threats. This report provides a high-level overview of the cyber security environment within the health sector over a twelve month period (1 January to 31 December 2020).

Iranian Islamic Revolutionary Guard Corps-Affiliated Cyber Actors Exploiting Vulnerabilities for Data Extortion and Disk Encryption for Ransom Operations   Advisory

Sep 15, 2022 - The Australian Signals Directorate's Australian Cyber Security Centre (ASD's ACSC) has joined with international cyber security agency partners to co-author an advisory on continued Iranian state-sponsored cyber threats. Organisations are encouraged to apply the recommended mitigations to protect themselves online.

Microsoft Exchange ProxyShell Targeting in Australia   Alert

Aug 19, 2021 - The Australian Signals Directorate’s Australian Cyber Security Centre (ASD’s ACSC) has observed targeting of the Microsoft Exchange ProxyShell vulnerability by Malicious actors.

#StopRansomware: BianLian Ransomware Group   Advisory

Nov 21, 2024 - The Federal Bureau of Investigation (FBI), Cybersecurity and Infrastructure Security Agency (CISA), and Australian Signals Directorate’s Australian Cyber Security Centre (ASD’s ACSC) are releasing this joint Cybersecurity Advisory to disseminate known BianLian ransomware and data extortion group IOCs and TTPs identified through FBI and ASD's ACSC investigations as of March 2023.

Guidelines for system hardening   Advice

Sep 4, 2025 - This chapter of the Information security manual (ISM) provides guidance on system hardening.

Cyber security best practices for smart cities   Publication

Apr 20, 2023 - This guidance is the result of a collaborative effort from the United States Cybersecurity and Infrastructure Security Agency (CISA), the United States National Security Agency (NSA), the United States Federal Bureau of Investigation (FBI), the United Kingdom National Cyber Security Centre (NCSC-UK), the Australian Signals Directorate’s Australian Cyber Security Centre (ASD’s ACSC), the Canadian Centre for Cyber Security (CCCS), and the New Zealand National Cyber Security Centre (NCSC-NZ).

Advisory 2020-004: Remote code execution vulnerability being actively exploited in vulnerable versions of Telerik UI by sophisticated actors   Advisory

May 22, 2020 - This advisory is focused around the targeting of CVE-2019-18935 but has significant overlap to the previously released ACSC 2019-126 advisory.

#StopRansomware: Play ransomware   Advisory

Jun 5, 2025 - This joint Cybersecurity Advisory (CSA) is part of an ongoing #StopRansomware effort to publish advisories for network defenders that detail various ransomware variants and ransomware threat actors.

System hardening  

Dec 2, 2020 - This page lists publications on the hardening of applications and IT equipment.

Health Sector Snapshot   News

Feb 10, 2021 - This Sector Snapshot is designed to enhance awareness of key cyber security threats in the health sector and advise executives and cyber security professionals within the health sector on what they can do to protect their organisation from cyber threats. This report provides a high-level overview of the cyber security environment from 1 January to 31 December 2020.

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Nov 3, 2022 -

Personal cyber security: First steps guide   Guidance

Apr 14, 2023 - The first of three cyber security guides in the personal cyber security series is designed to help everyday Australians understand a basic level of cyber security and how to take action to protect themselves from cyber threats.

Engaging with artificial intelligence   Publication

Jan 24, 2024 - The purpose of this paper is to provide organisations with guidance on how to use artificial intelligence (AI) systems securely. The paper summarises some important threats related to AI systems and includes cybersecurity mitigation strategies to aid organisations in engaging with AI while managing risk. It provides mitigations to assist both organisations that maintain their own AI systems and organisations that use third-party AI systems.