{"id":107006,"date":"2025-12-19T22:14:50","date_gmt":"2025-12-19T22:14:50","guid":{"rendered":"https:\/\/mailinvest.blog\/index.php\/2025\/12\/19\/cisco-email-security-products-actively-targeted-in-zero-day-campaign\/"},"modified":"2025-12-19T22:15:53","modified_gmt":"2025-12-19T22:15:53","slug":"cisco-email-security-products-actively-targeted-in-zero-day-campaign","status":"publish","type":"post","link":"https:\/\/mailinvest.blog\/index.php\/2025\/12\/19\/cisco-email-security-products-actively-targeted-in-zero-day-campaign\/","title":{"rendered":"Cisco email security products actively targeted in zero-day campaign"},"content":{"rendered":"<p> <a href=\"https:\/\/go.fiverr.com\/visit\/?bta=1052423&nci=17043\" Target=\"_Top\"><img loading=\"lazy\" decoding=\"async\" border=\"0\" src=\"https:\/\/mailinvest.blog\/wp-content\/themes\/breek\/assets\/images\/transparent.gif\" data-lazy=\"true\" data-src=\"https:\/\/fiverr.ck-cdn.com\/tn\/serve\/?cid=40081059\"  width=\"601\" height=\"201\"><\/a>\n<\/p>\n<div id=\"article-body\">\n<hr id=\"d364020b-04a9-455a-9e6b-84db15e30c60\"\/>\n<ul id=\"f146e23f-ff26-45e7-8a91-b0dacd61ef57\">\n<li><strong>Cisco confirms zero\u2011day (CVE\u20112025\u201120393) in Safe Electronic mail home equipment exploited by China\u2011linked actors<\/strong><\/li>\n<li><strong>Attackers deployed Aquashell backdoor, tunneling instruments, and log\u2011clearing utilities for persistence<\/strong><\/li>\n<li><strong>CISA added flaw to KEV; businesses should remediate\/cease use by December 24<\/strong><\/li>\n<\/ul>\n<hr id=\"c9969787-3171-4571-bce8-3285d55ffa6c\"\/>\n<p id=\"16f6c5d2-c5b0-434a-9b68-df7716f5ab83\">A China-affiliated risk actor has been abusing a zero-day vulnerability in a number of Cisco e-mail home equipment to achieve entry to the underlying system and set up persistence.<\/p>\n<p>Cisco confirmed the information in a weblog put up and a safety advisory, urging customers to use offered suggestions and harden their networks.<\/p>\n<p><a id=\"elk-seasonal\" class=\"paywall\" aria-hidden=\"true\" data-url=\"\" href=\"\" target=\"_blank\" referrerpolicy=\"no-referrer-when-downgrade\" data-hl-processed=\"none\"\/><\/p>\n<aside data-block-type=\"embed\" data-render-type=\"fte\" data-skip=\"dealsy\" data-widget-type=\"seasonal\" class=\"hawk-root\"\/>\n<p id=\"16f6c5d2-c5b0-434a-9b68-df7716f5ab83-2\">In its announcement, Cisco said it first spotted the activity on December 10, and determined that it started at least in late November 2025. In the campaign, the threat actor tracked as UAT-9686 abused a bug in Cisco AsyncOS Software for <a data-analytics-id=\"inline-link\" href=\"https:\/\/www.techradar.com\/best\/best-email-clients\" target=\"_blank\" data-mrf-recirculation=\"inline-link\" data-before-rewrite-localise=\"https:\/\/www.techradar.com\/best\/best-email-clients\">Cisco Secure Email Gateway<\/a>, and Cisco Safe Electronic mail and Net Supervisor, to execute system-level instructions and deploy a persistent Python-based <a data-analytics-id=\"inline-link\" href=\"https:\/\/www.techradar.com\/best\/best-malware-removal\" target=\"_blank\" data-mrf-recirculation=\"inline-link\" data-before-rewrite-localise=\"https:\/\/www.techradar.com\/best\/best-malware-removal\">backdoor<\/a> referred to as Aquashell.<\/p>\n<aside data-component-name=\"Recirculation:ArticleRiver\" data-recirculation-type=\"inline\" data-mrf-recirculation=\"Trending Bar\" data-nosnippet=\"\" class=\"clear-both pt-3 pb-4 mb-4 border-solid border-y border-neutral-300\">\n<span class=\"font-article-heading block pb-3 !text-base font-bold uppercase sm:text-sm text-[#333]\"><br \/>\nChances are you&#8217;ll like<br \/>\n<\/span><\/p>\n<\/aside>\n<p><a id=\"elk-acd0b5d3-2f21-45d8-b5c7-1902cca12dcd\" class=\"paywall\" aria-hidden=\"true\" data-url=\"\" href=\"\" target=\"_blank\" referrerpolicy=\"no-referrer-when-downgrade\" data-hl-processed=\"none\"\/><\/p>\n<h2 id=\"two-groups-3\">Two groups<\/h2>\n<p id=\"465588b3-e7c6-4a91-806e-e1ca852527cb\">The vulnerability is now tracked as CVE-2025-20393 and was given a severity score of 10\/10 (critical).<\/p>\n<p>The group was also seen deploying AquaTunnel (a reverse SSH tunnel) chisel (another tunneling tool), and AquaPurge (log-clearing utility).<\/p>\n<p>Given the tools and infrastructure used, Cisco believes the attacks are being conducted by at least two groups &#8211; tracked as APT41, and UNC5174. Both are very active and quite dangerous &#8211; abusing legitimate cloud services, breaching VPNs, firewalls, and other tools, while engaging primarily in cyber-espionage.<\/p>\n<p>At the same time, the US Cybersecurity and Infrastructure Security Agency (CISA) added it to its Known Exploited Vulnerabilities (KEV) catalog, confirming abuse in the wild. Federal Civilian Executive Branch agencies have until December 24 to apply the provided fixes or stop using the vulnerable products entirely.<\/p>\n<div id=\"slice-container-newsletterForm-articleInbodyContent-bNkD8ZL6J7fKP3EZXQEJCJ\" class=\"slice-container newsletter-inbodyContent-slice newsletterForm-articleInbodyContent-bNkD8ZL6J7fKP3EZXQEJCJ slice-container-newsletterForm\">\n<div data-hydrate=\"true\" class=\"newsletter-form__wrapper newsletter-form__wrapper--inbodyContent\">\n<div class=\"newsletter-form__container\">\n<section class=\"newsletter-form__top-bar\"\/>\n<section class=\"newsletter-form__main-section\">\n<p class=\"newsletter-form__strapline\">Sign up to the TechRadar Pro newsletter to get all the top news, opinion, features and guidance your business needs to succeed!<\/p>\n<\/section>\n<\/div>\n<\/div>\n<\/div>\n<p>In the advisory, Cisco said customers should restore the devices exposed to the internet to a secure configuration. If they are prevented from doing so, they should reach out to Cisco to see if they were compromised or not.<\/p>\n<p>\u201cIn case of confirmed compromise, rebuilding the appliances is, currently, the only viable option to eradicate the threat actors\u2019 persistence mechanism from the appliance,\u201d Cisco said. \u201cIn addition, Cisco strongly recommends restricting access to the appliance and implementing robust access control mechanisms to ensure that ports are not exposed to unsecured networks.\u201d<\/p>\n<p><em>Via <\/em><a data-analytics-id=\"inline-link\" href=\"https:\/\/therecord.media\/chinese-attackers-zero-day\" target=\"_blank\" data-url=\"https:\/\/therecord.media\/chinese-attackers-zero-day\" referrerpolicy=\"no-referrer-when-downgrade\" data-hl-processed=\"none\" data-mrf-recirculation=\"inline-link\"><em>The Record<\/em><\/a><\/p>\n<hr id=\"f46fd962-62fc-4af7-b21e-df595091f1a1\"\/>\n<div id=\"slice-container-person-bNkD8ZL6J7fKP3EZXQEJCJ-W6hR4X5WtETL9NqHYDQspfeNlRbmnMiR\" class=\"slice-container person-wrapper person-bNkD8ZL6J7fKP3EZXQEJCJ-W6hR4X5WtETL9NqHYDQspfeNlRbmnMiR slice-container-person\">\n<div class=\"person person--separator\">\n<div class=\"person__avatar-block\">\n<figure class=\"image-wrapped__wrapper\" data-bordeaux-image-check=\"false\">\n<div class=\"image-wrapped__widthsetter\" style=\"max-width:none\">\n<div class=\"image-wrapped__aspect-padding\" style=\"padding-bottom:56.25%\">\n<div style=\"display:contents\"><picture data-hydrate=\"false\"><source class=\"person__avatar image-wrapped__image image__image\" type=\"image\/webp\" srcset=\"https:\/\/cdn.mos.cms.futurecdn.net\/HpHXmtXFPnuzaQ8m9xNW8j-140-80.png.webp 140w\" sizes=\"99vw\" data-normal=\"https:\/\/cdn.mos.cms.futurecdn.net\/HpHXmtXFPnuzaQ8m9xNW8j.png\" data-original-mos=\"https:\/\/cdn.mos.cms.futurecdn.net\/HpHXmtXFPnuzaQ8m9xNW8j.png\" data-pin-media=\"https:\/\/cdn.mos.cms.futurecdn.net\/HpHXmtXFPnuzaQ8m9xNW8j.png\" data-pin-nopin=\"true\" data-slice-image=\"true\"\/><source class=\"person__avatar image-wrapped__image image__image\" type=\"image\/png\" srcset=\"https:\/\/cdn.mos.cms.futurecdn.net\/HpHXmtXFPnuzaQ8m9xNW8j-140-80.png 140w\" sizes=\"99vw\" data-normal=\"https:\/\/cdn.mos.cms.futurecdn.net\/HpHXmtXFPnuzaQ8m9xNW8j.png\" data-original-mos=\"https:\/\/cdn.mos.cms.futurecdn.net\/HpHXmtXFPnuzaQ8m9xNW8j.png\" data-pin-media=\"https:\/\/cdn.mos.cms.futurecdn.net\/HpHXmtXFPnuzaQ8m9xNW8j.png\" data-pin-nopin=\"true\" data-slice-image=\"true\"\/><img decoding=\"async\" alt=\"Best antivirus software header\" data-srcset=\"https:\/\/cdn.mos.cms.futurecdn.net\/HpHXmtXFPnuzaQ8m9xNW8j-140-80.png 140w\" data-sizes=\"99vw\" class=\"person__avatar image-wrapped__image image__image\" loading=\"lazy\" data-normal=\"https:\/\/cdn.mos.cms.futurecdn.net\/HpHXmtXFPnuzaQ8m9xNW8j.png\" src=\"https:\/\/mailinvest.blog\/wp-content\/themes\/breek\/assets\/images\/transparent.gif\" data-lazy=\"true\" data-src=\"https:\/\/cdn.mos.cms.futurecdn.net\/HpHXmtXFPnuzaQ8m9xNW8j.png\" data-pin-media=\"https:\/\/cdn.mos.cms.futurecdn.net\/HpHXmtXFPnuzaQ8m9xNW8j.png\" data-pin-nopin=\"true\" data-slice-image=\"true\"\/><\/picture><\/div>\n<\/div>\n<\/div>\n<\/figure>\n<\/div>\n<div class=\"person__heading\">\n<p><span class=\"person__name\">The very best antivirus for all budgets<\/span><\/p>\n<aside class=\"person__role\">Our prime picks, based mostly on real-world testing and comparisons<\/aside>\n<\/div>\n<\/div>\n<\/div>\n<p id=\"cdd8e80c-0eee-49ee-a436-55c20a26cf98\"><em\/><a data-analytics-id=\"inline-link\" href=\"https:\/\/news.google.com\/publications\/CAAqKAgKIiJDQklTRXdnTWFnOEtEWFJsWTJoeVlXUmhjaTVqYjIwb0FBUAE?hl=en-GB&amp;gl=GB&amp;ceid=GB%3Aen\" target=\"_blank\" data-url=\"https:\/\/news.google.com\/publications\/CAAqKAgKIiJDQklTRXdnTWFnOEtEWFJsWTJoeVlXUmhjaTVqYjIwb0FBUAE?hl=en-GB&amp;gl=GB&amp;ceid=GB%3Aen\" referrerpolicy=\"no-referrer-when-downgrade\" data-hl-processed=\"none\" data-mrf-recirculation=\"inline-link\"><em><strong>Follow TechRadar on Google News<\/strong><\/em><\/a> and<em> <\/em><a data-analytics-id=\"inline-link\" href=\"https:\/\/www.google.com\/preferences\/source?q=techradar.com\" target=\"_blank\" data-url=\"https:\/\/www.google.com\/preferences\/source?q=techradar.com\" referrerpolicy=\"no-referrer-when-downgrade\" data-hl-processed=\"none\" data-mrf-recirculation=\"inline-link\"><em><strong>add us as a preferred source<\/strong><\/em><\/a><em> to get our knowledgeable information, opinions, and opinion in your feeds. Be sure that to click on the Observe button!<\/em><\/p>\n<p><em>And naturally you may also <\/em><a data-analytics-id=\"inline-link\" href=\"https:\/\/www.tiktok.com\/@techradar\" target=\"_blank\" data-url=\"https:\/\/www.tiktok.com\/@techradar\" referrerpolicy=\"no-referrer-when-downgrade\" data-hl-processed=\"none\" data-mrf-recirculation=\"inline-link\"><em><strong>follow TechRadar on TikTok<\/strong><\/em><\/a><em> for information, opinions, unboxings in video kind, and get common updates from us on <\/em><a data-analytics-id=\"inline-link\" href=\"https:\/\/whatsapp.com\/channel\/0029Va6HybZ9RZAY7pIUK12h\" target=\"_blank\" data-url=\"https:\/\/whatsapp.com\/channel\/0029Va6HybZ9RZAY7pIUK12h\" referrerpolicy=\"no-referrer-when-downgrade\" data-hl-processed=\"none\" data-mrf-recirculation=\"inline-link\"><em><strong>WhatsApp<\/strong><\/em><\/a><em> too.<\/em><\/p>\n<\/div>\n<p><script async src=\"\/\/www.tiktok.com\/embed.js\"><\/script><br \/>\n<br \/><iframe data-lazy=\"true\" data-src=\"https:\/\/www.fiverr.com\/gig_widgets?id=U2FsdGVkX18x7XQvttUTrv1oEqmGNGTgvvCUiUoJ\/AP4z\/UyMz8lXGOLpu15jIMxBbTR0gmD5uBoFvhC4KWeALQRp3h\/X\/AwcVD0K8Wj9H\/ZzYKzcCNHosB9oS4SCJJFWiN85P9ICAc4OgCoE\/wHKIY7CDkf2\/DQ1vqGvk4smVe5cRDEmrLPCWi4FC8p40VUhSmWQ5udCm0zoJtorgWv3vbDQw0kKYkwn39ozAnQXDe+YvWMxkLFWA+O3TFwkJvdkIK+\/AUSnRssPKt5WHY0FhNOxnSPcLslEL4G4\/RfP95ve99U+kRnDy3X+KtzdQLY+u935ghON\/o3UE4IMv9oN6JX9RnxzL\/LRcOgnHigxStSGPKsZYtnz8RWNVT\/rOLAibqiWJadC5MYHRbekF3eg6FOGrQGkXYbsn0+a5aovnlLCbLwIqY9fcS17UX8J235iQ6cdmHNbrPeS84CMm34RA==&affiliate_id=1052423&strip_google_tagmanager=true\" loading=\"lazy\" data-with-title=\"true\" class=\"fiverr_nga_frame\" frameborder=\"0\" height=\"350\" width=\"100%\" referrerpolicy=\"no-referrer-when-downgrade\" data-mode=\"random_gigs\" onload=\" var frame = this; var script = document.createElement('script'); script.addEventListener('load', function() { window.FW_SDK.register(frame); }); script.setAttribute('src', 'https:\/\/www.fiverr.com\/gig_widgets\/sdk'); document.body.appendChild(script); \" ><\/iframe>\n<br \/><a href=\"https:\/\/www.techradar.com\/pro\/security\/cisco-email-security-products-actively-targeted-in-zero-day-campaign\">Source link <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Cisco confirms zero\u2011day (CVE\u20112025\u201120393) in Safe Electronic mail home equipment exploited by China\u2011linked actors Attackers deployed Aquashell backdoor, tunneling instruments, and log\u2011clearing utilities for persistence&#8230;<\/p>\n","protected":false},"author":1,"featured_media":107007,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-107006","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tech-universe"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Cisco email security products actively targeted in zero-day campaign - mailinvest.blog<\/title>\n<meta name=\"description\" content=\"Technology is forever changing, and there are always new pieces of technology to replace obsolete ones. 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