{"id":38278,"date":"2025-05-15T04:55:35","date_gmt":"2025-05-15T04:55:35","guid":{"rendered":""},"modified":"2025-08-08T01:13:43","modified_gmt":"2025-08-08T07:13:43","slug":"cve-2025-45843-authenticated-stack-overflow-vulnerability-in-totolink-nr1800x","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-45843-authenticated-stack-overflow-vulnerability-in-totolink-nr1800x\/","title":{"rendered":"<strong>CVE-2025-45843: Authenticated Stack Overflow Vulnerability in TOTOLINK NR1800X<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>The cybersecurity landscape continues to evolve with new vulnerabilities constantly being discovered. One of these is the CVE-2025-45843 vulnerability, an authenticated stack overflow found in the TOTOLINK NR1800X router firmware version V9.1.0u.6681_B20230703. This vulnerability could <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-4050-heap-corruption-in-google-chrome-devtools-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"43065\">potentially compromise systems and lead<\/a> to data leakage, posing a serious risk to users of the affected product.<br \/>\nThe issue lies in the ssid parameter of the setWiFiGuestCfg function. If exploited, it could lead to unauthorized <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-45616-incorrect-access-control-vulnerability-in-the-admin-api-of-brcc-v1-2-0\/\"  data-wpil-monitor-id=\"43316\">access and control<\/a> over the system. This is a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-4462-critical-buffer-overflow-vulnerability-in-totolink-n150rt-3-4-0-b20190525\/\"  data-wpil-monitor-id=\"45280\">critical concern for users and administrators of TOTOLINK<\/a> NR1800X routers, especially those managing sensitive data on their networks.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-45843<br \/>\nSeverity: High (CVSS: 8.8)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: Low<br \/>\nUser Interaction: Required<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-30165-potential-system-compromise-in-vllm-v0-engine\/\"  data-wpil-monitor-id=\"44033\">System compromise<\/a>, potential data leakage.<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-2239673418\" 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>TOTOLINK NR1800X | V9.1.0u.6681_B20230703<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The vulnerability in the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-38583-stack-based-buffer-overflow-vulnerability-in-gtkwave-3-3-115\/\"  data-wpil-monitor-id=\"43044\">TOTOLINK NR1800X firmware is due to an authenticated stack<\/a> overflow in the setWiFiGuestCfg function. This function fails to properly verify the ssid parameter for size before copying it into a fixed-length <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-41687-stack-based-buffer-overflow-vulnerability-in-u-link-management-api\/\"  data-wpil-monitor-id=\"68297\">buffer on the stack<\/a>. An attacker can exploit this flaw by sending a specially crafted request with an oversized ssid parameter, causing a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-4096-remote-heap-buffer-overflow-vulnerability-in-google-chrome-html-processing\/\"  data-wpil-monitor-id=\"43122\">buffer overflow<\/a>.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-485380292\" 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 <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5353-local-authenticated-attacker-exploit-in-ivanti-workspace-control\/\"  data-wpil-monitor-id=\"60911\">attacker might exploit<\/a> this vulnerability:<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/setWiFiGuestCfg HTTP\/1.1\nHost: target.example.com\nAuthorization: Basic [Base64-encoded credentials]\nContent-Type: application\/json\n{ &quot;ssid&quot;: &quot;&lt;malicious oversized string&gt;&quot; }<\/code><\/pre>\n<p>In this example, the attacker would replace &#8220; with their own payload that causes the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-49122-critical-heap-based-buffer-overflow-vulnerability-in-solid-edge-se2023\/\"  data-wpil-monitor-id=\"43380\">buffer overflow<\/a>.<\/p>\n<p><strong>Mitigation<\/strong><\/p>\n<p>The immediate mitigation for this vulnerability is to apply the vendor&#8217;s patch once it becomes available. As a temporary solution, users and administrators can employ Web Application Firewall (WAF) or Intrusion Detection Systems (IDS) to detect and prevent any <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-24274-input-validation-issue-exploitable-via-malicious-app-on-macos\/\"  data-wpil-monitor-id=\"60912\">malicious activities related to this exploit<\/a>. Regular monitoring and updating of <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-49126-critical-vulnerability-in-solid-edge-se2023-allows-for-potential-system-compromise\/\"  data-wpil-monitor-id=\"43448\">systems are always recommended to ensure that all potential vulnerabilities<\/a> are addressed promptly.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview The cybersecurity landscape continues to evolve with new vulnerabilities constantly being discovered. One of these is the CVE-2025-45843 vulnerability, an authenticated stack overflow found in the TOTOLINK NR1800X router firmware version V9.1.0u.6681_B20230703. This vulnerability could potentially compromise systems and lead to data leakage, posing a serious risk to users of the affected product. 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-38278","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\/38278","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=38278"}],"version-history":[{"count":10,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/38278\/revisions"}],"predecessor-version":[{"id":61737,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/38278\/revisions\/61737"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=38278"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=38278"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=38278"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=38278"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=38278"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=38278"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=38278"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=38278"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=38278"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}