{"id":56844,"date":"2025-07-03T09:12:36","date_gmt":"2025-07-03T09:12:36","guid":{"rendered":""},"modified":"2025-09-27T07:38:37","modified_gmt":"2025-09-27T13:38:37","slug":"cve-2025-6752-critical-stack-based-buffer-overflow-vulnerability-in-linksys-routers","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-6752-critical-stack-based-buffer-overflow-vulnerability-in-linksys-routers\/","title":{"rendered":"<strong>CVE-2025-6752: Critical Stack-Based Buffer Overflow Vulnerability in Linksys Routers<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>A critical security vulnerability, identified as CVE-2025-6752, has been discovered affecting several Linksys router models, including WRT1900ACS, EA7200, EA7450, and EA7500 up to 20250619. This vulnerability has been classified as critical due to its potential to compromise systems and leak data. This <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-43209-high-risk-out-of-bounds-access-vulnerability-affecting-multiple-apple-operating-systems\/\"  data-wpil-monitor-id=\"76021\">vulnerability is particularly concerning as it affects<\/a> the function SetDefaultConnectionService of the file \/upnp\/control\/Layer3Forwarding of the IGD component and can be exploited remotely. The exploit is publicly disclosed, and the vendor has yet to respond.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-6752<br \/>\nSeverity: Critical (8.8 CVSS score)<br \/>\nAttack Vector: Remote<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-6370-critical-vulnerability-in-d-link-dir-619l-2-06b01-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"63385\">Potential system<\/a> compromise and data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-1874222929\" class=\"ameeb-content-2 ameeb-entity-placement\"><div style=\"border-left: 4px solid #555; padding-left: 20px; margin: 48px 0; font-family: Roboto, sans-serif; color: #ffffff; line-height: 1.6; max-width: 700px;\">\r\n  <h2 style=\"margin-top: 0; font-size: 20px; font-weight: 600; display: flex; align-items: center;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"display: inline-flex; align-items: center; margin-right: 8px;\">\r\n      <img decoding=\"async\" src=\"https:\/\/www.ameeba.com\/blog\/wp-content\/uploads\/2025\/10\/Best-App-icon-Ameeba.png\" alt=\"Ameeba Chat Icon\" style=\"width: 40px; height: 40px;\" \/>\r\n    <\/a>\r\n    A new way to communicate\r\n  <\/h2>\r\n\r\n  <p style=\"margin-bottom: 12px;\">\r\n    Ameeba Chat is built on encrypted identity, not personal profiles.\r\n  <\/p>\r\n\r\n  <p style=\"margin-bottom: 16px;\">\r\n    Message, call, share files, and coordinate with identities kept separate.\r\n  <\/p>\r\n\r\n  <ul style=\"list-style: none; padding-left: 0; margin-bottom: 20px;\">\r\n    <li>\u2022 Encrypted identity<\/li>\r\n    <li>\u2022 Ameeba Chat authenticates access<\/li>\r\n    <li>\u2022 Aliases and categories<\/li>\r\n    <li>\u2022 End-to-end encrypted chat, calls, and files<\/li>\r\n    <li>\u2022 Secure notes for sensitive information<\/li>\r\n  <\/ul>\r\n\r\n  <p style=\"font-style: italic; font-weight: 600; margin-bottom: 24px;\">\r\n    Private communication, rethought.\r\n  <\/p>\r\n\r\n  <div style=\"display: flex; flex-wrap: wrap; gap: 12px;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\/download\" style=\"background-color: #ffffff; color: #000000; padding: 10px 20px; text-decoration: none; border-radius: 6px; font-weight: 500;\">Download Ameeba Chat<\/a>\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"border: 1px solid #ffffff; color: #ffffff; padding: 10px 20px; text-decoration: none; border-radius: 6px; font-weight: 500;\">Learn More<\/a>\r\n  <\/div>\r\n<\/div>\r\n<\/div>\n<p>Product | Affected Versions<\/p>\n<p>Linksys WRT1900ACS | Up to 20250619<br \/>\nLinksys EA7200 | Up to 20250619<br \/>\nLinksys EA7450 | Up to 20250619<br \/>\nLinksys EA7500 | Up to 20250619<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The vulnerability comes into play when an attacker manipulates the argument NewDefaultConnectionService, leading to a stack-based <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-6369-critical-buffer-overflow-vulnerability-in-d-link-dir-619l\/\"  data-wpil-monitor-id=\"63430\">buffer overflow<\/a>. This overflow then can cause the system to crash or, worse, allow the attacker to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49132-critical-arbitrary-code-execution-vulnerability-in-pterodactyl-game-server-management-panel\/\"  data-wpil-monitor-id=\"63273\">execute arbitrary code<\/a> on the system. This <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-48860-exploiting-backup-archives-to-gain-remote-access-in-ctrlx-os\/\"  data-wpil-monitor-id=\"81457\">exploitation can be initiated remotely<\/a>, making it a significant threat to any unprotected networks.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-429591859\" class=\"ameeb-content ameeb-entity-placement\"><div class=\"poptin-embedded\" data-id=\"f6b387694f681\"><\/div>\r\n\r\n\r\n\r\n\r\n\r\n<\/div>\n<p>Below is a conceptual example of how an HTTP <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-48921-cross-site-request-forgery-vulnerability-in-drupal-open-social\/\"  data-wpil-monitor-id=\"65029\">request exploiting this vulnerability<\/a> might look:<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/upnp\/control\/Layer3Forwarding HTTP\/1.1\nHost: target_router_IP\nContent-Type: application\/xml; charset=&quot;utf-8&quot;\nSOAPAction: &quot;urn:schemas-upnp-org:service:Layer3Forwarding:1#SetDefaultConnectionService&quot;\n&lt;?xml version=&quot;1.0&quot;?&gt;\n&lt;s:Envelope xmlns:s=&quot;http:\/\/schemas.xmlsoap.org\/soap\/envelope\/&quot; s:encodingStyle=&quot;http:\/\/schemas.xmlsoap.org\/soap\/encoding\/&quot;&gt;\n&lt;s:Body&gt;\n&lt;u:SetDefaultConnectionService xmlns:u=&quot;urn:schemas-upnp-org:service:Layer3Forwarding:1&quot;&gt;\n&lt;NewDefaultConnectionService&gt;[malicious_code]&lt;\/NewDefaultConnectionService&gt;\n&lt;\/u:SetDefaultConnectionService&gt;\n&lt;\/s:Body&gt;\n&lt;\/s:Envelope&gt;<\/code><\/pre>\n<p>In this example, the [malicious_code] placeholder would be replaced with the actual code designed to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-6368-critical-stack-based-buffer-overflow-vulnerability-in-d-link-dir-619l\/\"  data-wpil-monitor-id=\"63433\">overflow the buffer<\/a>.<\/p>\n<p><strong>Recommended Mitigation<\/strong><\/p>\n<p>Until the vendor <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-35115-critical-system-package-download-vulnerability-in-agiloft-release-28\/\"  data-wpil-monitor-id=\"85297\">releases a patch to fix this vulnerability<\/a>, users are advised to apply a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation. These solutions can help detect and <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-8059-critical-privilege-escalation-vulnerability-in-b-blocks-wordpress-plugin\/\"  data-wpil-monitor-id=\"76424\">block malicious activities related to this vulnerability<\/a>. Furthermore, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-44955-critical-vulnerability-in-ruckus-network-director-allows-jail-users-to-gain-root-access\/\"  data-wpil-monitor-id=\"76020\">users should regularly monitor their network<\/a> for any unusual activities.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview A critical security vulnerability, identified as CVE-2025-6752, has been discovered affecting several Linksys router models, including WRT1900ACS, EA7200, EA7450, and EA7500 up to 20250619. This vulnerability has been classified as critical due to its potential to compromise systems and leak data. This vulnerability is particularly concerning as it affects the function SetDefaultConnectionService of the [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[],"product":[],"attack_vector":[86],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-56844","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-buffer-overflow"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/56844","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/comments?post=56844"}],"version-history":[{"count":9,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/56844\/revisions"}],"predecessor-version":[{"id":78090,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/56844\/revisions\/78090"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=56844"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=56844"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=56844"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=56844"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=56844"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=56844"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=56844"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=56844"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=56844"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}