Governments issue warning over Cisco zero-day attacks dating back to 2023 | CyberScoop<\/title> <meta name=\"description\" content=\"Hackers exploited zero-day flaws in Cisco network devices for three years undetected. CISA issued an emergency directive as the global campaign continues.\"> <link rel=\"canonical\" href=\"https:\/\/cyberscoop.com\/cisco-zero-days-cisa-emergency-directive-five-eyes\/\"> <meta property=\"og:locale\" content=\"en_US\"> <meta property=\"og:type\" content=\"article\"> <meta property=\"og:title\" content=\"Governments issue warning over Cisco zero-day attacks dating back to 2023\"> <meta property=\"og:description\" content=\"Hackers exploited zero-day flaws in Cisco network devices for three years undetected. CISA issued an emergency directive as the global campaign continues.\"> <meta property=\"og:url\" content=\"https:\/\/cyberscoop.com\/cisco-zero-days-cisa-emergency-directive-five-eyes\/\"> <meta property=\"og:site_name\" content=\"CyberScoop\"> <meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/cyberscoop\/\"> <meta property=\"article:published_time\" content=\"2026-02-25T23:51:42+00:00\"> <meta property=\"article:modified_time\" content=\"2026-02-25T23:52:59+00:00\"> <meta property=\"og:image\" content=\"https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/02\/governments-issue-warning-over-cisco-zero-day-attacks-dating-back-to-2023-2.jpg\"> <meta property=\"og:image:width\" content=\"6204\"> <meta property=\"og:image:height\" content=\"4138\"> <meta property=\"og:image:type\" content=\"image\/jpeg\"> <meta name=\"author\" content=\"Matt Kapko\"> <meta name=\"twitter:card\" content=\"summary_large_image\"> <meta name=\"twitter:creator\" 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href=\"https:\/\/cyberscoop.com\/cisco-zero-days-cisa-emergency-directive-five-eyes\/#main\" class=\"skip-to-content-link visually-hidden-focusable\">Skip to main content<\/a> <\/p>\n<div class=\"ad ad--top ad--top-desktop\">\n<div class=\"ad__inner\"> <span class=\"screen-reader-text\">Advertisement<\/span> <\/div>\n<\/div>\n<p> <main id=\"main\" role=\"main\" tabindex=\"-1\"> <\/p>\n<div class=\"ad ad--top ad--top-mobile\">\n<div class=\"ad__inner\"> <span class=\"screen-reader-text\">Advertisement<\/span> <\/div>\n<\/div>\n<section id=\"stickybar\" class=\"stickybar stickybar--newsletter js-stickybar\" readability=\"0.82\"> <button class=\"stickybar__close js-stickybar-close\" aria-controls=\"stickybar\"> <svg class=\"icon icon--close\" width=\"21\" height=\"22\" viewBox=\"0 0 21 22\" fill=\"none\"><path d=\"m.822.518-.805.805L9.695 11 .017 20.678l.805.805 9.678-9.678 9.677 9.678.806-.805L11.305 11l9.678-9.677-.806-.805-9.677 9.677L.822.518Z\" fill=\"currentColor\" \/><\/svg> <span class=\"visually-hidden\">Close<\/span> <\/button> <\/section>\n<article class=\"single-article content\">\n<div class=\"single-article__container js-single-article-content\">\n<header class=\"single-article__header \" readability=\"25.037337662338\">\n<div class=\"single-article__header-content\" readability=\"31.085324232082\">\n<p> The global campaign marks the second series of multiple actively exploited zero-day vulnerabilities in Cisco edge technology since last spring. The similarities don\u2019t end there. <\/p>\n<p>   <\/div>\n<div class=\"single-article__cover-wrap\">\n<figure class=\"single-article__cover\"> <img data-recalc-dims=\"1\" fetchpriority=\"high\" width=\"640\" height=\"427\" src=\"https:\/\/i0.wp.com\/ddi.mohflo.net\/wp-content\/uploads\/2026\/02\/governments-issue-warning-over-cisco-zero-day-attacks-dating-back-to-2023.jpg?resize=640%2C427&ssl=1\" class=\"single-article__cover-image wp-post-image\" alt decoding=\"async\" fetchpriority=\"high\" srcset=\"https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/02\/governments-issue-warning-over-cisco-zero-day-attacks-dating-back-to-2023-2.jpg 6204w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/02\/governments-issue-warning-over-cisco-zero-day-attacks-dating-back-to-2023-2.jpg?resize=300,200 300w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/02\/governments-issue-warning-over-cisco-zero-day-attacks-dating-back-to-2023-2.jpg?resize=768,512 768w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/02\/governments-issue-warning-over-cisco-zero-day-attacks-dating-back-to-2023-2.jpg?resize=1024,683 1024w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/02\/governments-issue-warning-over-cisco-zero-day-attacks-dating-back-to-2023-2.jpg?resize=1536,1024 1536w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/02\/governments-issue-warning-over-cisco-zero-day-attacks-dating-back-to-2023-2.jpg?resize=2048,1366 2048w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/02\/governments-issue-warning-over-cisco-zero-day-attacks-dating-back-to-2023-2.jpg?resize=600,400 600w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/02\/governments-issue-warning-over-cisco-zero-day-attacks-dating-back-to-2023-2.jpg?resize=252,168 252w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/02\/governments-issue-warning-over-cisco-zero-day-attacks-dating-back-to-2023-2.jpg?resize=505,337 505w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/02\/governments-issue-warning-over-cisco-zero-day-attacks-dating-back-to-2023-2.jpg?resize=1012,675 1012w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/02\/governments-issue-warning-over-cisco-zero-day-attacks-dating-back-to-2023-2.jpg?resize=1264,843 1264w\" sizes=\"(max-width: 1012px) 100vw, 1012px\"><figcaption> (Getty Images) <\/figcaption><\/figure>\n<\/p><\/div>\n<\/header>\n<div class=\"single-article__content\">\n<div class=\"single-article__content-inner has-drop-cap\"> <html readability=\"44.599259692188\"><body readability=\"92.454465075155\"><\/p>\n<p>Attackers have been exploiting a pair of zero-day vulnerabilities in Cisco\u2019s network edge software for at least three years, and the global campaign is ongoing, authorities said across a series of warnings released Wednesday.<\/p>\n<p>The Cybersecurity and Infrastructure Security Agency issued an <a href=\"https:\/\/www.cisa.gov\/news-events\/directives\/ed-26-03-mitigate-vulnerabilities-cisco-sd-wan-systems\">emergency directive<\/a> about the global attacks and issued <a href=\"https:\/\/www.cisa.gov\/news-events\/directives\/supplemental-direction-ed-26-03-hunt-and-hardening-guidance-cisco-sd-wan-systems\">joint guidance with the Five Eyes<\/a> to help defenders respond and <a href=\"https:\/\/www.cyber.gov.au\/sites\/default\/files\/2026-02\/ACSC-led%20Cisco%20SD-WAN%20Hunt%20Guide.pdf\">hunt for evidence of compromise<\/a>.<\/p>\n<p>This marks the second series of multiple actively exploited zero-day vulnerabilities in Cisco edge technology since last spring. Both campaigns resulted in CISA emergency directives months after the attacks were first detected, and both attack sprees were underway for at least a year before they were identified.<\/p>\n<p>Authorities refrained from attributing the attacks to any nation state or threat group. Cisco Talos researchers assigned the exploits and post-compromise activity to <a href=\"https:\/\/blog.talosintelligence.com\/uat-8616-sd-wan\/\">UAT-8616,<\/a> which they only described as a \u201chighly sophisticated threat actor.\u201d<\/p>\n<div class=\"ad ad--inline_1 \">\n<div class=\"ad__inner\"> <span class=\"screen-reader-text\">Advertisement<\/span> <\/div>\n<\/div>\n<p>The activity cluster\u2019s \u201cattempted exploitation indicates a continuing trend of the targeting of network edge devices by cyber threat actors to establish persistent footholds into high-value organizations including critical infrastructure sectors,\u201d Cisco Talos said in a threat advisory.<\/p>\n<p>Malicious activity linked to this campaign is far reaching and attackers have exploited vulnerabilities in targeted systems to access and potentially compromise federal networks, Nick Andersen, CISA\u2019s executive assistant director for cybersecurity, said during a media briefing Wednesday. <\/p>\n<p>Andersen declined to say when CISA was first aware of this activity and did not provide details about potential victims, adding that officials are working through the beginning stages of mitigation.<\/p>\n<p>In the jointly issued threat hunt guide, the Five Eyes said all members were aware that the most recent zero-day \u2014 <a href=\"https:\/\/nvd.nist.gov\/vuln\/detail\/CVE-2026-20127\">CVE-2026-20127<\/a> \u2014 was identified and confirmed actively exploited in late 2025. Officials and Cisco did not explain why it took at least two months to disclose and patch the vulnerability, and share emergency mitigation guidance. <\/p>\n<p>Attackers are gaining full control of a system in a chain by exploiting CVE-2026-20127 to bypass authentication, then downgrading software to a version vulnerable to <a href=\"https:\/\/nvd.nist.gov\/vuln\/detail\/cve-2022-20775\">CVE-2022-20775<\/a> to escalate privileges, said Douglass McKee, director of vulnerability intelligence at Rapid7.<\/p>\n<div class=\"ad ad--inline_1 \">\n<div class=\"ad__inner\"> <span class=\"screen-reader-text\">Advertisement<\/span> <\/div>\n<\/div>\n<p>\u201cThat second step allows them to move from administrative control to root on the underlying operating system. That downgrade step shows deliberate knowledge of product versioning and patch history,\u201d he told CyberScoop. \u201cThis is not opportunistic scanning. This is structured tradecraft.\u201d<\/p>\n<p>CISA added CVE-2022-20775 and CVE-2026-20127 to its <a href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\">known exploited vulnerabilities catalog<\/a> Wednesday.<\/p>\n<p>The three-year gap between known initial attacks and detected exploitation of the zero-days showcases the attackers\u2019 surgical use of vulnerabilities and the highly targeted nature of their campaign, said Ben Harris, founder and CEO of watchTowr. <\/p>\n<p>The timeline and known attack path also indicates operational discipline that allowed attackers to maintain long-term access in critical network infrastructure without triggering alarms, McKee said. Those activities align \u201cmore closely with state-sponsored espionage tradecraft than financially motivated crime,\u201d he added.<\/p>\n<p>CISA\u2019s emergency directive requires federal agencies to take inventory of all vulnerable Cisco SD-WAN systems, collect logs from those systems, apply Cisco\u2019s security updates, hunt for evidence of compromise and follow <a href=\"https:\/\/sec.cloudapps.cisco.com\/security\/center\/resources\/Cisco-Catalyst-SD-WAN-HardeningGuide\">Cisco\u2019s guidance<\/a> by Friday. <\/p>\n<div class=\"ad ad--inline_1 \">\n<div class=\"ad__inner\"> <span class=\"screen-reader-text\">Advertisement<\/span> <\/div>\n<\/div>\n<p>The latest campaign targeting Cisco network edge technology shares many similarities with another string of attacks officials and Cisco <a href=\"https:\/\/cyberscoop.com\/cisa-emergency-directive-cisco-zero-days\/\">warned about in September<\/a>. Those attacks, which involved at least two actively exploited zero-days, were <a href=\"https:\/\/cyberscoop.com\/cisa-emergency-directive-timeline-investigation\/\">underway for at least a year<\/a> before they were first discovered in May. <\/p>\n<p>Cisco did not answer questions about any potential connections between the campaigns. The vendor and officials have also thus far avoided sharing any details about what occurred behind the scenes during these sustained attacks.<\/p>\n<p>A spokesperson for Cisco urged customers to upgrade software and follow <a href=\"https:\/\/sec.cloudapps.cisco.com\/security\/center\/content\/CiscoSecurityAdvisory\/cisco-sa-sdwan-rpa-EHchtZk\">guidance from its advisory<\/a>. <\/p>\n<p>Unfortunately, it\u2019s too late for some Cisco SD-WAN customers to patch, Harris said. \u201cCisco\u2019s advice to fully rebuild and look for prior signs of intrusion should be taken seriously.\u201d<\/p>\n<p><\/body> <\/p>\n<footer class=\"single-article__footer\" readability=\"2.9827302631579\">\n<div class=\"author-card\" readability=\"14\">\n<div class=\"author-card__avatar\">\n<figure class=\"author-card__image-wrap\"> <img data-recalc-dims=\"1\" decoding=\"async\" class=\"author-card__image\" src=\"https:\/\/i0.wp.com\/ddi.mohflo.net\/wp-content\/uploads\/2026\/02\/governments-issue-warning-over-cisco-zero-day-attacks-dating-back-to-2023-1.jpg?w=640&ssl=1\" alt=\"Matt Kapko\"> <\/figure>\n<\/p><\/div>\n<p><h4 class=\"author-card__name\">Written by Matt Kapko<\/h4>\n<p> Matt Kapko is a reporter at CyberScoop. His beat includes cybercrime, ransomware, software defects and vulnerability (mis)management. The lifelong Californian started his journalism career in 2001 with previous stops at Cybersecurity Dive, CIO, SDxCentral and RCR Wireless News. 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{"id":8382,"date":"2026-02-25T17:51:42","date_gmt":"2026-02-25T23:51:42","guid":{"rendered":"https:\/\/cyberscoop.com\/?p=87933"},"modified":"2026-02-25T17:51:42","modified_gmt":"2026-02-25T23:51:42","slug":"governments-issue-warning-over-cisco-zero-day-attacks-dating-back-to-2023","status":"publish","type":"post","link":"https:\/\/ddi.mohflo.net\/index.php\/2026\/02\/25\/governments-issue-warning-over-cisco-zero-day-attacks-dating-back-to-2023\/","title":{"rendered":"Governments issue warning over Cisco zero-day attacks dating back to 2023"},"content":{"rendered":"