{"id":1842,"date":"2025-12-18T14:39:17","date_gmt":"2025-12-18T14:39:17","guid":{"rendered":"https:\/\/www.tsfactory.com\/forums\/?p=1842"},"modified":"2025-12-18T14:39:17","modified_gmt":"2025-12-18T14:39:17","slug":"cisco-warns-of-active-attacks-exploiting-unpatched-0-day-in-asyncos-email-security-appliances","status":"publish","type":"post","link":"https:\/\/www.tsfactory.com\/forums\/blog\/cisco-warns-of-active-attacks-exploiting-unpatched-0-day-in-asyncos-email-security-appliances\/","title":{"rendered":"Cisco Warns of Active Attacks Exploiting Unpatched 0-Day in AsyncOS Email Security Appliances"},"content":{"rendered":"<p>Cisco has alerted users to a maximum-severity zero-day flaw in Cisco AsyncOS software that has been actively exploited by a China-nexus advanced persistent threat (APT) actor codenamed UAT-9686 in attacks targeting Cisco Secure Email Gateway and Cisco Secure Email and Web Manager.<\/p>\n<p>The networking equipment major said it became aware of the intrusion campaign on December 10, 2025, and that it has singled out a &#8220;limited subset of appliances&#8221; with certain ports open to the internet. It&#8217;s currently not known how many customers are affected.<\/p>\n<p>&#8220;This attack allows the threat actors to execute arbitrary commands with root privileges on the underlying operating system of an affected appliance,&#8221; Cisco\u00a0<a href=\"https:\/\/sec.cloudapps.cisco.com\/security\/center\/content\/CiscoSecurityAdvisory\/cisco-sa-sma-attack-N9bf4\" target=\"_blank\" rel=\"noopener\">said<\/a>\u00a0in an advisory. &#8220;The ongoing investigation has revealed evidence of a persistence mechanism planted by the threat actors to maintain a degree of control over compromised appliances.&#8221;<\/p>\n<p>The as-yet-unpatched vulnerability is being tracked as\u00a0<strong><a href=\"https:\/\/nvd.nist.gov\/vuln\/detail\/CVE-2025-20393\" target=\"_blank\" rel=\"noopener\">CVE-2025-20393<\/a><\/strong>, and carries a CVSS score of 10.0. It concerns a case of improper input validation that allows threat actors to execute malicious instructions with elevated privileges on the underlying operating system.<\/p>\n<div><a href=\"https:\/\/thehackernews.com\/2025\/12\/cisco-warns-of-active-attacks.html\">Read the Full Story Here<\/a><\/div>\n<div><\/div>\n<div>Source: The Hacker News<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Cisco has alerted users to a maximum-severity zero-day flaw in Cisco AsyncOS software that has been actively exploited by a China-nexus advanced persistent threat (APT) actor codenamed UAT-9686 in attacks targeting Cisco Secure Email Gateway and Cisco Secure Email and Web Manager. The networking equipment major said it became aware of the intrusion campaign on [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":1843,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-1842","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Cisco Warns of Active Attacks Exploiting Unpatched 0-Day in AsyncOS Email Security Appliances - Community<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.tsfactory.com\/forums\/blog\/cisco-warns-of-active-attacks-exploiting-unpatched-0-day-in-asyncos-email-security-appliances\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cisco Warns of Active Attacks Exploiting Unpatched 0-Day in AsyncOS Email Security Appliances - Community\" \/>\n<meta property=\"og:description\" content=\"Cisco has alerted users to a maximum-severity zero-day flaw in Cisco AsyncOS software that has been actively exploited by a China-nexus advanced persistent threat (APT) actor codenamed UAT-9686 in attacks targeting Cisco Secure Email Gateway and Cisco Secure Email and Web Manager. The networking equipment major said it became aware of the intrusion campaign on [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.tsfactory.com\/forums\/blog\/cisco-warns-of-active-attacks-exploiting-unpatched-0-day-in-asyncos-email-security-appliances\/\" \/>\n<meta property=\"og:site_name\" content=\"Community\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/TSFactoryLLC\/\" \/>\n<meta property=\"article:published_time\" content=\"2025-12-18T14:39:17+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.tsfactory.com\/forums\/wp-content\/uploads\/2025\/12\/cisco.png\" \/>\n\t<meta property=\"og:image:width\" content=\"400\" \/>\n\t<meta property=\"og:image:height\" content=\"200\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Chelsie Wyatt\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@TSFactoryLLC\" \/>\n<meta name=\"twitter:site\" content=\"@TSFactoryLLC\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Chelsie Wyatt\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.tsfactory.com\/forums\/blog\/cisco-warns-of-active-attacks-exploiting-unpatched-0-day-in-asyncos-email-security-appliances\/\",\"url\":\"https:\/\/www.tsfactory.com\/forums\/blog\/cisco-warns-of-active-attacks-exploiting-unpatched-0-day-in-asyncos-email-security-appliances\/\",\"name\":\"Cisco Warns of Active Attacks Exploiting Unpatched 0-Day in AsyncOS Email Security Appliances - Community\",\"isPartOf\":{\"@id\":\"https:\/\/www.tsfactory.com\/forums\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.tsfactory.com\/forums\/blog\/cisco-warns-of-active-attacks-exploiting-unpatched-0-day-in-asyncos-email-security-appliances\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.tsfactory.com\/forums\/blog\/cisco-warns-of-active-attacks-exploiting-unpatched-0-day-in-asyncos-email-security-appliances\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.tsfactory.com\/forums\/wp-content\/uploads\/2025\/12\/cisco.png\",\"datePublished\":\"2025-12-18T14:39:17+00:00\",\"author\":{\"@id\":\"https:\/\/www.tsfactory.com\/forums\/#\/schema\/person\/9d9908f0e12559297335ebe9b601c82f\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.tsfactory.com\/forums\/blog\/cisco-warns-of-active-attacks-exploiting-unpatched-0-day-in-asyncos-email-security-appliances\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.tsfactory.com\/forums\/blog\/cisco-warns-of-active-attacks-exploiting-unpatched-0-day-in-asyncos-email-security-appliances\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.tsfactory.com\/forums\/blog\/cisco-warns-of-active-attacks-exploiting-unpatched-0-day-in-asyncos-email-security-appliances\/#primaryimage\",\"url\":\"https:\/\/www.tsfactory.com\/forums\/wp-content\/uploads\/2025\/12\/cisco.png\",\"contentUrl\":\"https:\/\/www.tsfactory.com\/forums\/wp-content\/uploads\/2025\/12\/cisco.png\",\"width\":400,\"height\":200},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.tsfactory.com\/forums\/blog\/cisco-warns-of-active-attacks-exploiting-unpatched-0-day-in-asyncos-email-security-appliances\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.tsfactory.com\/forums\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Cisco Warns of Active Attacks Exploiting Unpatched 0-Day in AsyncOS Email Security Appliances\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.tsfactory.com\/forums\/#website\",\"url\":\"https:\/\/www.tsfactory.com\/forums\/\",\"name\":\"Community\",\"description\":\"TSFactory\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.tsfactory.com\/forums\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.tsfactory.com\/forums\/#\/schema\/person\/9d9908f0e12559297335ebe9b601c82f\",\"name\":\"Chelsie Wyatt\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.tsfactory.com\/forums\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/09ff3801fb7566acf715fe4e81a9bd942b923c236138a3ed8a8375f099e5d6d6?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/09ff3801fb7566acf715fe4e81a9bd942b923c236138a3ed8a8375f099e5d6d6?s=96&d=mm&r=g\",\"caption\":\"Chelsie Wyatt\"},\"url\":\"https:\/\/www.tsfactory.com\/forums\/blog\/author\/chelsie\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Cisco Warns of Active Attacks Exploiting Unpatched 0-Day in AsyncOS Email Security Appliances - Community","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.tsfactory.com\/forums\/blog\/cisco-warns-of-active-attacks-exploiting-unpatched-0-day-in-asyncos-email-security-appliances\/","og_locale":"en_US","og_type":"article","og_title":"Cisco Warns of Active Attacks Exploiting Unpatched 0-Day in AsyncOS Email Security Appliances - Community","og_description":"Cisco has alerted users to a maximum-severity zero-day flaw in Cisco AsyncOS software that has been actively exploited by a China-nexus advanced persistent threat (APT) actor codenamed UAT-9686 in attacks targeting Cisco Secure Email Gateway and Cisco Secure Email and Web Manager. The networking equipment major said it became aware of the intrusion campaign on [&hellip;]","og_url":"https:\/\/www.tsfactory.com\/forums\/blog\/cisco-warns-of-active-attacks-exploiting-unpatched-0-day-in-asyncos-email-security-appliances\/","og_site_name":"Community","article_publisher":"https:\/\/www.facebook.com\/TSFactoryLLC\/","article_published_time":"2025-12-18T14:39:17+00:00","og_image":[{"width":400,"height":200,"url":"https:\/\/www.tsfactory.com\/forums\/wp-content\/uploads\/2025\/12\/cisco.png","type":"image\/png"}],"author":"Chelsie Wyatt","twitter_card":"summary_large_image","twitter_creator":"@TSFactoryLLC","twitter_site":"@TSFactoryLLC","twitter_misc":{"Written by":"Chelsie Wyatt","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.tsfactory.com\/forums\/blog\/cisco-warns-of-active-attacks-exploiting-unpatched-0-day-in-asyncos-email-security-appliances\/","url":"https:\/\/www.tsfactory.com\/forums\/blog\/cisco-warns-of-active-attacks-exploiting-unpatched-0-day-in-asyncos-email-security-appliances\/","name":"Cisco Warns of Active Attacks Exploiting Unpatched 0-Day in AsyncOS Email Security Appliances - Community","isPartOf":{"@id":"https:\/\/www.tsfactory.com\/forums\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.tsfactory.com\/forums\/blog\/cisco-warns-of-active-attacks-exploiting-unpatched-0-day-in-asyncos-email-security-appliances\/#primaryimage"},"image":{"@id":"https:\/\/www.tsfactory.com\/forums\/blog\/cisco-warns-of-active-attacks-exploiting-unpatched-0-day-in-asyncos-email-security-appliances\/#primaryimage"},"thumbnailUrl":"https:\/\/www.tsfactory.com\/forums\/wp-content\/uploads\/2025\/12\/cisco.png","datePublished":"2025-12-18T14:39:17+00:00","author":{"@id":"https:\/\/www.tsfactory.com\/forums\/#\/schema\/person\/9d9908f0e12559297335ebe9b601c82f"},"breadcrumb":{"@id":"https:\/\/www.tsfactory.com\/forums\/blog\/cisco-warns-of-active-attacks-exploiting-unpatched-0-day-in-asyncos-email-security-appliances\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.tsfactory.com\/forums\/blog\/cisco-warns-of-active-attacks-exploiting-unpatched-0-day-in-asyncos-email-security-appliances\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.tsfactory.com\/forums\/blog\/cisco-warns-of-active-attacks-exploiting-unpatched-0-day-in-asyncos-email-security-appliances\/#primaryimage","url":"https:\/\/www.tsfactory.com\/forums\/wp-content\/uploads\/2025\/12\/cisco.png","contentUrl":"https:\/\/www.tsfactory.com\/forums\/wp-content\/uploads\/2025\/12\/cisco.png","width":400,"height":200},{"@type":"BreadcrumbList","@id":"https:\/\/www.tsfactory.com\/forums\/blog\/cisco-warns-of-active-attacks-exploiting-unpatched-0-day-in-asyncos-email-security-appliances\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.tsfactory.com\/forums\/"},{"@type":"ListItem","position":2,"name":"Cisco Warns of Active Attacks Exploiting Unpatched 0-Day in AsyncOS Email Security Appliances"}]},{"@type":"WebSite","@id":"https:\/\/www.tsfactory.com\/forums\/#website","url":"https:\/\/www.tsfactory.com\/forums\/","name":"Community","description":"TSFactory","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.tsfactory.com\/forums\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/www.tsfactory.com\/forums\/#\/schema\/person\/9d9908f0e12559297335ebe9b601c82f","name":"Chelsie Wyatt","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.tsfactory.com\/forums\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/09ff3801fb7566acf715fe4e81a9bd942b923c236138a3ed8a8375f099e5d6d6?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/09ff3801fb7566acf715fe4e81a9bd942b923c236138a3ed8a8375f099e5d6d6?s=96&d=mm&r=g","caption":"Chelsie Wyatt"},"url":"https:\/\/www.tsfactory.com\/forums\/blog\/author\/chelsie\/"}]}},"_links":{"self":[{"href":"https:\/\/www.tsfactory.com\/forums\/wp-json\/wp\/v2\/posts\/1842","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.tsfactory.com\/forums\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tsfactory.com\/forums\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tsfactory.com\/forums\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tsfactory.com\/forums\/wp-json\/wp\/v2\/comments?post=1842"}],"version-history":[{"count":1,"href":"https:\/\/www.tsfactory.com\/forums\/wp-json\/wp\/v2\/posts\/1842\/revisions"}],"predecessor-version":[{"id":1844,"href":"https:\/\/www.tsfactory.com\/forums\/wp-json\/wp\/v2\/posts\/1842\/revisions\/1844"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.tsfactory.com\/forums\/wp-json\/wp\/v2\/media\/1843"}],"wp:attachment":[{"href":"https:\/\/www.tsfactory.com\/forums\/wp-json\/wp\/v2\/media?parent=1842"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tsfactory.com\/forums\/wp-json\/wp\/v2\/categories?post=1842"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tsfactory.com\/forums\/wp-json\/wp\/v2\/tags?post=1842"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}