{"id":11881,"date":"2026-03-02T13:49:04","date_gmt":"2026-03-02T19:49:04","guid":{"rendered":"https:\/\/beaconlab.us\/publicacion\/alert-2026-20-critical-vulnerability-in-cisco-sd-wan\/"},"modified":"2026-09-29T08:36:43","modified_gmt":"2026-09-29T14:36:43","slug":"alert-2026-20-critical-vulnerability-in-cisco-sd-wan","status":"publish","type":"publicacion","link":"https:\/\/beaconlab.us\/en\/publication\/alert-2026-20-critical-vulnerability-in-cisco-sd-wan\/","title":{"rendered":"Alert 2026-20 Critical vulnerability in Cisco SD-WAN"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Affected product(s):<\/h2>\n\n<p class=\"wp-block-paragraph\">The vulnerability affects the following components of Cisco Catalyst SD-WAN:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>SD-WAN Controller (vSmart)<\/strong><\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">Affected versions: 20.3.1 \u2013 20.14.3, 20.15.1<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>SD-WAN Manager (vManage)<\/strong><\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">Affected versions: 20.3.1 \u2013 20.14.3, 20.15.1<\/p>\n\n<p class=\"wp-block-paragraph\">Applies to on-premises and cloud deployments, including standard, managed, and FedRAMP environments.<\/p>\n\n<h2 class=\"wp-block-heading\">Description<\/h2>\n\n<p class=\"wp-block-paragraph\">A critical vulnerability known as <strong>CVE-2026-20127<\/strong> (CVSS 10.0) has been reported, which is being actively exploited since 2023. The flaw originates in an error in the peering authentication mechanism of the SD-WAN system.<\/p>\n\n<p class=\"wp-block-paragraph\">The vulnerability allows a remote attacker, without the need for credentials or user interaction, to send manipulated requests to bypass authentication. As a result, the attacker can gain access with high privileges and modify the complete SD-WAN network configuration, including:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Alter network routes<\/li>\n\n\n\n<li>Add malicious devices or peers<\/li>\n\n\n\n<li>Manipulate critical configurations<\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading\">Solution:<\/h2>\n\n<p class=\"wp-block-paragraph\">Update immediately to the fixed versions:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>SD-WAN Controller (vSmart)<\/strong><\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">Fixed versions: 20.14.4, 20.15.2<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>SD-WAN Manager (vManage)<\/strong><\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">Fixed versions: 20.14.4, 20.15.2<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>Cisco Catalyst SD-WAN Release<\/strong><\/td><td><strong>First fixed version<\/strong><\/td><\/tr><\/thead><tbody><tr><td>Before 20.9<sup>1<\/sup><\/td><td>Migrate to a fixed release.<\/td><\/tr><tr><td>20.9<\/td><td>20.9.8.2<\/td><\/tr><tr><td>20.11<sup>1<\/sup><\/td><td>20.12.6.1<\/td><\/tr><tr><td>20.12<\/td><td>20.12.5.3<br \/>20.12.6.1<\/td><\/tr><tr><td>20.13<sup>1<\/sup><\/td><td>20.15.4.2<\/td><\/tr><tr><td>20.14<sup>1<\/sup><\/td><td>20.15.4.2<\/td><\/tr><tr><td>20.15<\/td><td>20.15.4.2<\/td><\/tr><tr><td>20.16<sup>1<\/sup><\/td><td>20.18.2.1<\/td><\/tr><tr><td>20.18<\/td><td>20.18.2.1<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">For more information on how to update the SD-WAN, you can follow the following link:<\/p>\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.cisco.com\/c\/dam\/en\/us\/td\/docs\/Website\/enterprise\/catalyst-sdwan-upgrade-matrix\/index.html\">https:\/\/www.cisco.com\/c\/dam\/en\/us\/td\/docs\/Website\/enterprise\/catalyst-sdwan-upgrade-matrix\/index.html<\/a><\/p>\n\n<h2 class=\"wp-block-heading\">Additional information:<\/h2>\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/sec.cloudapps.cisco.com\/security\/center\/content\/CiscoSecurityAdvisory\/cisco-sa-sdwan-rpa-EHchtZk\">https:\/\/sec.cloudapps.cisco.com\/security\/center\/content\/CiscoSecurityAdvisory\/cisco-sa-sdwan-rpa-EHchtZk<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/blog.elhacker.net\/2026\/03\/vulnerabilidad-critica-de-dia-cero-en.html\">Blog elhacker.NET: Critical zero-day vulnerability in Cisco SD-WAN exploited since 2023 to gain root access<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.csa.gov.sg\/alerts-and-advisories\/alerts\/al-2026-019\/\">https:\/\/www.csa.gov.sg\/alerts-and-advisories\/alerts\/al-2026-019\/<\/a><\/li>\n\n\n\n<li>\u00a0<\/li>\n<\/ul>\n","protected":false},"featured_media":11171,"template":"","class_list":["post-11881","publicacion","type-publicacion","status-publish","has-post-thumbnail","hentry"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"Affected product(s): The vulnerability affects the following components of Cisco Catalyst SD-WAN: SD-WAN Controller (vSmart) Affected versions: 20.3.1 \u2013 20.14.3, 20.15.1 SD-WAN Manager (vManage) Affected versions: 20.3.1 \u2013 20.14.3, 20.15.1 Applies to on-premises and cloud deployments, including standard, managed, and FedRAMP environments. Description A critical vulnerability known as CVE-2026-20127 (CVSS 10.0) has been reported, which\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/beaconlab.us\/en\/publication\/alert-2026-20-critical-vulnerability-in-cisco-sd-wan\/\" \/>\n\t\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.3\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Beacon Lab - CSIRT by Cybolt\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Alert 2026-20 Critical vulnerability in Cisco SD-WAN - Beacon Lab\" \/>\n\t\t<meta property=\"og:description\" content=\"Affected product(s): The vulnerability affects the following components of Cisco Catalyst SD-WAN: SD-WAN Controller (vSmart) Affected versions: 20.3.1 \u2013 20.14.3, 20.15.1 SD-WAN Manager (vManage) Affected versions: 20.3.1 \u2013 20.14.3, 20.15.1 Applies to on-premises and cloud deployments, including standard, managed, and FedRAMP environments. 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