{"id":41298,"date":"2025-05-20T20:50:11","date_gmt":"2025-05-20T20:50:11","guid":{"rendered":""},"modified":"2025-08-31T06:32:20","modified_gmt":"2025-08-31T12:32:20","slug":"cve-2025-45865-critical-buffer-overflow-vulnerability-in-totolink-a3002r","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-45865-critical-buffer-overflow-vulnerability-in-totolink-a3002r\/","title":{"rendered":"<strong>CVE-2025-45865: Critical Buffer Overflow Vulnerability in TOTOLINK A3002R<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>In today&#8217;s cybersecurity landscape, a notable vulnerability has been discovered, identified as CVE-2025-45865. This vulnerability affects TOTOLINK A3002R v4.0.0-B20230531.1404, a popular networking device widely used by businesses and individuals worldwide. The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-39274-integer-overflow-vulnerabilities-in-gtkwave-3-3-115-facgeometry-parsing\/\"  data-wpil-monitor-id=\"46347\">vulnerability is related to a buffer overflow<\/a> condition tied to the &#8216;dnsaddr&#8217; parameter in the &#8216;formDhcpv6s&#8217; interface. Given the widespread usage of this device, this vulnerability poses a significant risk, as it may <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-34332-critical-vulnerability-in-ami-s-spx-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"47558\">potentially lead to system<\/a> compromise or data leakage.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-45865<br \/>\nSeverity: Critical (9.8 CVSS score)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-27891-samsung-mobile-and-wearable-processors-vulnerability-leads-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"50766\">System compromise and potential<\/a> data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-362493376\" 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><a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-45863-buffer-overflow-vulnerability-in-totolink-a3002r-routers\/\"  data-wpil-monitor-id=\"48893\">TOTOLINK A3002R<\/a> | v4.0.0-B20230531.1404<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The exploit works by sending an oversized &#8216;dnsaddr&#8217; parameter to the &#8216;formDhcpv6s&#8217; interface of the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-45861-critical-buffer-overflow-vulnerability-in-totolink-a3002r-router\/\"  data-wpil-monitor-id=\"48905\">TOTOLINK A3002R<\/a>. This results in a buffer overflow condition, allowing the attacker to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47732-a-critical-remote-code-execution-vulnerability-in-microsoft-dataverse\/\"  data-wpil-monitor-id=\"46296\">execute arbitrary code<\/a>. This can <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-34333-critical-vulnerability-in-ami-s-spx-leads-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"47588\">lead to a complete system compromise and potentially<\/a> expose sensitive data to the attacker.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-1054972169\" 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&#8217;s a conceptual example of how the vulnerability might be exploited. This example illustrates an HTTP POST request that contains a malicious payload designed to exploit the buffer <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-39270-critical-integer-overflow-vulnerabilities-in-gtkwave-3-3-115\/\"  data-wpil-monitor-id=\"46348\">overflow vulnerability<\/a>.<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/formDhcpv6s HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/json\n{ &quot;dnsaddr&quot;: &quot;A long string that causes a buffer overflow...&quot; }<\/code><\/pre>\n<p>This request would trigger the buffer overflow condition, thereby potentially <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-20182-critical-vulnerability-in-cisco-device-software-allows-dos-attacks\/\"  data-wpil-monitor-id=\"46247\">allowing the attacker to execute arbitrary code on the vulnerable<\/a> system.<\/p>\n<p><strong>Mitigation<\/strong><\/p>\n<p>Users of the affected <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-4732-critical-buffer-overflow-vulnerability-in-totolink-a3002r-and-a3002ru\/\"  data-wpil-monitor-id=\"50765\">TOTOLINK A3002R<\/a> version are strongly advised to apply the vendor patch as soon as it becomes available. In the interim, the use of a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation. These systems can be configured to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-8059-critical-privilege-escalation-vulnerability-in-b-blocks-wordpress-plugin\/\"  data-wpil-monitor-id=\"76388\">block or alert on attempts to exploit this vulnerability<\/a>. Despite these temporary measures, the most effective mitigation strategy is to apply the vendor&#8217;s <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49002-critical-vulnerability-in-dataease-bypassing-patch-for-cve-2025-32966\/\"  data-wpil-monitor-id=\"76389\">patch to completely eliminate the vulnerability<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview In today&#8217;s cybersecurity landscape, a notable vulnerability has been discovered, identified as CVE-2025-45865. This vulnerability affects TOTOLINK A3002R v4.0.0-B20230531.1404, a popular networking device widely used by businesses and individuals worldwide. The vulnerability is related to a buffer overflow condition tied to the &#8216;dnsaddr&#8217; parameter in the &#8216;formDhcpv6s&#8217; interface. Given the widespread usage of this [&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-41298","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\/41298","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=41298"}],"version-history":[{"count":10,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/41298\/revisions"}],"predecessor-version":[{"id":68842,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/41298\/revisions\/68842"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=41298"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=41298"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=41298"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=41298"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=41298"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=41298"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=41298"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=41298"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=41298"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}