{"id":71991,"date":"2025-09-06T17:03:09","date_gmt":"2025-09-06T17:03:09","guid":{"rendered":""},"modified":"2025-10-10T05:20:43","modified_gmt":"2025-10-10T11:20:43","slug":"cve-2025-9781-critical-buffer-overflow-vulnerability-in-totolink-a702r","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-9781-critical-buffer-overflow-vulnerability-in-totolink-a702r\/","title":{"rendered":"<strong>CVE-2025-9781: Critical Buffer Overflow Vulnerability in TOTOLINK A702R<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>In the ever-evolving world of cybersecurity, new vulnerabilities are a common occurrence. One such critical vulnerability has been discovered in TOTOLINK A702R version 4.0.0-B20211108.1423. This vulnerability, assigned the identifier CVE-2025-9781, is a severe threat to all users of the affected product as the exploit can be initiated remotely, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-42957-critical-backdoor-vulnerability-in-sap-s-4hana-exposes-systems-to-potential-compromise\/\"  data-wpil-monitor-id=\"79584\">potentially leading to system<\/a> compromise or data leakage.<br \/>\nThis <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-8730-critical-vulnerability-in-belkin-routers-due-to-hard-coded-credentials\/\"  data-wpil-monitor-id=\"81071\">vulnerability is particularly concerning due<\/a> to the high CVSS severity score of 8.8, indicating a high impact upon successful exploitation. This <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-50644-authentication-bypass-vulnerability-in-zhisheng17-blog-3-0-1-snapshot\/\"  data-wpil-monitor-id=\"82380\">blog post aims to detail the vulnerability<\/a>, its impact, and the necessary steps to mitigate the threat.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-9781<br \/>\nSeverity: Critical (8.8 CVSS Score)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47136-integer-underflow-vulnerability-in-indesign-desktop-versions-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"79723\">Potential system<\/a> compromise or data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-4020680023\" 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: 720px;\">\r\n  <h2 style=\"margin-top: 0; font-size: 22px; font-weight: 600; display: flex; align-items: center; letter-spacing: -0.02em;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"display: inline-flex; align-items: center; margin-right: 10px;\">\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: 42px; height: 42px;\" \/>\r\n    <\/a>\r\n    Share secrets securely\r\n  <\/h2>\r\n\r\n  <p style=\"margin-bottom: 14px; color: #d1d5db;\">\r\n    Ameeba is private infrastructure for communication and sensitive work built on encrypted identity instead of exposed corporate identity systems.\r\n  <\/p>\r\n\r\n  <p style=\"margin-bottom: 18px; color: #a1a1aa;\">\r\n    Passwords, credentials, confidential files, screenshots, internal discussions, sensitive AI context, and private coordination should not become exposed across ordinary communication platforms.\r\n  <\/p>\r\n\r\n  <ul style=\"list-style: none; padding-left: 0; margin-bottom: 24px; color: #e4e4e7;\">\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Encrypted identity<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Private Spaces for organizations and teams<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 End-to-end encrypted chat, calls, files, and notes<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Sensitive AI work and protected collaboration<\/li>\r\n    <li>\u2022 Built for information that cannot leak<\/li>\r\n  <\/ul>\r\n\r\n  <p style=\"font-style: italic; font-weight: 600; margin-bottom: 24px; color: #ffffff;\">\r\n    Our mission is to secure human work alongside AI.\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: 8px; font-weight: 500;\">\r\n      Download Ameeba\r\n    <\/a>\r\n\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"border: 1px solid #ffffff; color: #ffffff; padding: 10px 20px; text-decoration: none; border-radius: 8px; font-weight: 500;\">\r\n      Learn More\r\n    <\/a>\r\n  <\/div>\r\n<\/div><\/div>\n<p>Product | Affected Versions<\/p>\n<p><a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-9779-totolink-a702r-buffer-overflow-vulnerability-in-the-function-sub-4162dc\/\"  data-wpil-monitor-id=\"85106\">TOTOLINK A702R<\/a> | 4.0.0-B20211108.1423<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-43343-critical-memory-handling-vulnerability-in-multiple-apple-operating-systems\/\"  data-wpil-monitor-id=\"89553\">vulnerability lies in the handling<\/a> of the &#8216;ip6addr&#8217; argument in the function &#8216;sub_4162DC&#8217; of the file &#8216;\/boafrm\/formFilter. By manipulating this argument, an attacker can cause a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-9245-high-risk-buffer-overflow-vulnerability-in-linksys-extenders\/\"  data-wpil-monitor-id=\"81044\">buffer overflow<\/a> condition. <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47169-heap-based-buffer-overflow-vulnerability-in-microsoft-office-word\/\"  data-wpil-monitor-id=\"81999\">Buffer overflows<\/a> occur when more data is written to a piece of memory than it can handle, which can cause data to spill over into adjacent memory spaces.<br \/>\nIn this case, an attacker could send a specially crafted request containing a long &#8216;ip6addr&#8217; argument to the target device. This overflow can corrupt memory and potentially allow for the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-54135-critical-remote-code-execution-vulnerability-in-cursor-code-editor\/\"  data-wpil-monitor-id=\"79572\">execution of arbitrary code<\/a> or cause a denial of service.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-2029705853\" 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>Here is a conceptual example of how the vulnerability might be exploited:<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/boafrm\/formFilter HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/x-www-form-urlencoded\nip6addr=0201:0db8:85a3:0000:0000:8a2e:0370:7334...[additional data]<\/code><\/pre>\n<p>In this example, the &#8216;ip6addr&#8217; argument is filled with more data than it can handle, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47971-buffer-over-read-in-virtual-hard-disk-leading-to-privilege-escalation\/\"  data-wpil-monitor-id=\"80175\">leading to a buffer<\/a> overflow.<br \/>\nPlease note that this is a simplified and conceptual example. Real-world exploits may involve additional techniques or steps to successfully exploit the vulnerability.<\/p>\n<p><strong>Mitigation<\/strong><\/p>\n<p>The vendor has <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-43245-critical-downgrade-issue-affecting-multiple-macos-versions\/\"  data-wpil-monitor-id=\"81780\">issued a patch for the affected<\/a> product. Users are strongly advised to apply this patch immediately. If unable to patch immediately, users should consider using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation measure, although these are not guaranteed to fully protect against the exploit.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview In the ever-evolving world of cybersecurity, new vulnerabilities are a common occurrence. One such critical vulnerability has been discovered in TOTOLINK A702R version 4.0.0-B20211108.1423. This vulnerability, assigned the identifier CVE-2025-9781, is a severe threat to all users of the affected product as the exploit can be initiated remotely, potentially leading to system compromise or [&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":[86,87],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-71991","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-buffer-overflow","attack_vector-dos"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/71991","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=71991"}],"version-history":[{"count":11,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/71991\/revisions"}],"predecessor-version":[{"id":82399,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/71991\/revisions\/82399"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=71991"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=71991"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=71991"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=71991"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=71991"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=71991"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=71991"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=71991"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=71991"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}