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Cybersecurity and Infrastructure Security Agency (CISA)

You are subscribed to Cybersecurity Advisories for Cybersecurity and Infras= tructure Security Agency. This information has recently been updated and is=
now available.

CISA, ASD=E2=80=99s ACSC, and Partners Release Joint Guidance on Isolating = Vital Operational Technology and Enabling Systems During Crisis [ https://w= ww.cisa.gov/resources-tools/resources/ci-fortify-advice-isolating-vital-sys= tems ] 07/28/2026 11:00 AM EST=20

Today, the Cybersecurity and Infrastructure Security Agency (CISA) and the = Australian Signals Directorate=E2=80=99s Australian Cyber Security Centre (= ASD=E2=80=99s ACSC), in collaboration with the Federal Bureau of Investigat= ion (FBI) and international partners, published joint guidance "CI Fortify = =E2=80=93 Advice for isolating vital systems" [ https://www.cisa.gov/resour= ces-tools/resources/ci-fortify-advice-isolating-vital-systems ]. This guida= nce, aligned with CISA=E2=80=99s CI Fortify [ https://www.cisa.gov/topics/i= ndustrial-control-systems/ci-fortify ] initiative, is designed to help crit= ical infrastructure (CI) owners and operators prepare to isolate their oper= ational technology (OT) and enabling systems to maintain essential operatio=
ns during a significant cybersecurity incident or crisis.

State-sponsored cyber threat actors are increasingly targeting critical inf= rastructure for pre-positioning. By physically isolating vital OT and enabl= ing systems, CI operators and defenders can disrupt adversaries, contain at= tacks in progress, and rebuild compromised systems.

This joint guidance provides practical steps for isolating vital systems, s= uch as identifying and mapping critical assets [ https://www.cisa.gov/resou= rces-tools/resources/foundations-ot-cybersecurity-asset-inventory-guidance-= owners-and-operators ] and connections, building effective separation point=
s, and developing graduated isolation plans with regular testing. The guida= nce also outlines temporary measures to support network isolation for organ= izations unable to physically isolate, while emphasizing that physical isol= ation remains the most risk-effective solution.

Read the isolation guidance [ https://www.cisa.gov/resources-tools/resource= s/ci-fortify-advice-isolating-vital-systems ] to learn more. Visit the CI F= ortify webpage [ https://www.cisa.gov/topics/industrial-control-systems/ci-= fortify ] for additional resources on CI security and resilience.

Please share your thoughts with us through this anonymous survey [ https://= cisasurvey.gov1.qualtrics.com/jfe/form/SV_9n4TtB8uttUPaM6?Source=3DGovDeliv= erycifortifyisolatingvitalsystems ]. We appreciate your feedback.

This product is provided subject to this Notification [ https://www.cisa.go= v/notification ] and this Privacy & Use [ https://www.cisa.gov/privacy-poli=
cy ] policy.

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<p><img src=3D"https://content.govdelivery.com/attachments/fancy_images/U= SDHSCISA/2020/06/3486054/05152023-gov-delivery-banner-copy_original.png" al= t=3D"Cybersecurity and Infrastructure Security Agency (CISA)" title=3D"" wi= dth=3D"600" height=3D"100"></p>
<p>You are subscribed to Cybersecurity Advisories for Cybersecurity and I= nfrastructure Security Agency. This information has recently been updated a=
nd is now available.</p>
<div class=3D"rss_item" style=3D"margin-bottom: 2em;">
<div class=3D"rss_title" style=3D"font-weight: bold; font-size: 120%; margi=
n: 0 0 0.3em; padding: 0;"><a href=3D"https://www.cisa.gov/resources-tools/= resources/ci-fortify-advice-isolating-vital-systems" target=3D"_blank" titl= e=3D"CISA, ASD=E2=80=99s ACSC, and Partners Release Joint Guidance on Isola= ting Vital Operational Technology and Enabling Systems During Crisis" rel= =3D"noopener">CISA, ASD=E2=80=99s ACSC, and Partners Release Joint Guidance=
on Isolating Vital Operational Technology and Enabling Systems During Cris= is</a></div>
<div class=3D"rss_pub_date" style=3D"font-size: 90%; font-style: italic; co= lor: #666666; margin: 0 0 0.3em; padding: 0;">07/28/2026 11:00 AM EST</div> <div class=3D"l-page-section l-page-section--rich-text csaf-imported">
<div class=3D"l-constrain">
<div class=3D"l-page-section__content">
<p>Today, the Cybersecurity and Infrastructure Security Agency (CISA) and t=
he Australian Signals Directorate=E2=80=99s Australian Cyber Security Centr=
e (ASD=E2=80=99s ACSC), in collaboration with the Federal Bureau of Investi= gation (FBI) and international partners, published joint guidance <a href= =3D"https://www.cisa.gov/resources-tools/resources/ci-fortify-advice-isolat= ing-vital-systems" target=3D"_blank" title=3D"CI Fortify =E2=80=93 Advice f=
or isolating vital systems" rel=3D"noopener"><em>CI Fortify =E2=80=93 Advic=
e for isolating vital systems</em></a>. This guidance, aligned with CISA=E2= =80=99s <a href=3D"https://www.cisa.gov/topics/industrial-control-systems/c= i-fortify" target=3D"_blank" title=3D"CI Fortify" rel=3D"noopener">CI Forti= fy</a> initiative, is designed to help critical infrastructure (CI) owners = and operators prepare to isolate their operational technology (OT) and enab= ling systems to maintain essential operations during a significant cybersec= urity incident or crisis.</p>
<p>State-sponsored cyber threat actors are increasingly targeting critical = infrastructure for pre-positioning. By physically isolating vital OT and en= abling systems, CI operators and defenders can disrupt adversaries, contain=
attacks in progress, and rebuild compromised systems.</p>
<p>This joint guidance provides practical steps for isolating vital systems=
, such as <a href=3D"https://www.cisa.gov/resources-tools/resources/foundat= ions-ot-cybersecurity-asset-inventory-guidance-owners-and-operators" target= =3D"_blank" title=3D"identifying and mapping critical assets" rel=3D"noopen= er">identifying and mapping critical assets</a> and connections, building e= ffective separation points, and developing graduated isolation plans with r= egular testing. The guidance also outlines temporary measures to support ne= twork isolation for organizations unable to physically isolate, while empha= sizing that physical isolation remains the most risk-effective solution.</p=

<p>Read the <a href=3D"https://www.cisa.gov/resources-tools/resources/ci-fo= rtify-advice-isolating-vital-systems" target=3D"_blank" title=3D"isolation = guidance" rel=3D"noopener">isolation guidance</a> to learn more. Visit the =
<a href=3D"https://www.cisa.gov/topics/industrial-control-systems/ci-fortif=
y" target=3D"_blank" title=3D"CI Fortify webpage" rel=3D"noopener">CI Forti=
fy webpage</a> for additional resources on CI security and resilience.</p> <p>Please share your thoughts with us through this <a href=3D"https://cisas= urvey.gov1.qualtrics.com/jfe/form/SV_9n4TtB8uttUPaM6?Source=3DGovDeliveryci= fortifyisolatingvitalsystems" target=3D"_blank" title=3D"anonymous survey" = rel=3D"noopener">anonymous survey</a>. We appreciate your feedback.</p>
<p>This product is provided subject to this <a href=3D"https://www.cisa.gov= /notification" target=3D"_blank" title=3D"Notification" rel=3D"noopener">No= tification</a> and this <a href=3D"https://www.cisa.gov/privacy-policy" tar= get=3D"_blank" title=3D"Privacy &amp; Use" rel=3D"noopener">Privacy &amp; U= se</a> policy.</p>
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