{"id":72113,"date":"2025-09-07T05:06:52","date_gmt":"2025-09-07T05:06:52","guid":{"rendered":""},"modified":"2025-10-03T17:38:56","modified_gmt":"2025-10-03T23:38:56","slug":"cve-2025-9791-critical-vulnerability-in-tenda-ac20-16-03-08-05-leading-to-potential-system-compromise","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-9791-critical-vulnerability-in-tenda-ac20-16-03-08-05-leading-to-potential-system-compromise\/","title":{"rendered":"<strong>CVE-2025-9791: Critical Vulnerability in Tenda AC20 16.03.08.05 Leading to Potential System Compromise<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>A significant weakness has been identified in Tenda AC20 16.03.08.05, a popular wireless router firmware. This vulnerability, designated as CVE-2025-9791, has far-reaching implications and could potentially lead to system compromise or data leakage. This issue particularly affects the file \/goform\/fromAdvSetMacMtuWan, which due to a flaw, could be manipulated to trigger a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-9245-high-risk-buffer-overflow-vulnerability-in-linksys-extenders\/\"  data-wpil-monitor-id=\"81053\">buffer overflow<\/a>. It is an alarming revelation since <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-23310-remote-code-execution-vulnerability-in-nvidia-triton-inference-server\/\"  data-wpil-monitor-id=\"80315\">remote exploitation of this vulnerability<\/a> is possible, and the exploit has already been made publicly available.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-9791<br \/>\nSeverity: High (CVSS: 8.8)<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=\"79680\">System compromise and potential<\/a> data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-863775812\" 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-2025-10120-critical-buffer-overflow-vulnerability-in-tenda-ac20-routers\/\"  data-wpil-monitor-id=\"88592\">Tenda AC20<\/a> | 16.03.08.05<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The exploit works by manipulating the argument wanMTU in the \/goform\/fromAdvSetMacMtuWan file. By doing this, a stack-based <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47169-heap-based-buffer-overflow-vulnerability-in-microsoft-office-word\/\"  data-wpil-monitor-id=\"82005\">buffer overflow<\/a> is triggered. <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47174-heap-based-buffer-overflow-in-microsoft-office-excel-leading-to-unauthorized-code-execution\/\"  data-wpil-monitor-id=\"82018\">Buffer overflows<\/a> are caused when more data is written to a piece of memory or a buffer than it can handle. This overflow of data can then overwrite adjacent memory spaces, causing unpredictable behavior such as crashes, incorrect results, and in this case, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-53763-improper-access-control-in-azure-databricks-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"79789\">potentially granting unauthorized access to the system&#8217;s<\/a> resources.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-4218584004\" 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>This is a conceptual example of how an HTTP <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49382-cross-site-request-forgery-vulnerability-in-jobzilla-wordpress-theme\/\"  data-wpil-monitor-id=\"81165\">request could be used to exploit this vulnerability<\/a>. The &#8220;malicious_payload&#8221; would be specifically designed to trigger the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-9249-stack-based-buffer-overflow-vulnerability-in-linksys-range-extenders\/\"  data-wpil-monitor-id=\"82152\">buffer overflow<\/a>.<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/goform\/fromAdvSetMacMtuWan HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/json\n{ &quot;wanMTU&quot;: &quot;malicious_payload&quot; }<\/code><\/pre>\n<p>Please note this is a simplified representation and in a real-world scenario, the malicious payload would be specially crafted data that would cause the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-9248-critical-stack-based-buffer-overflow-vulnerability-in-linksys-devices\/\"  data-wpil-monitor-id=\"82377\">buffer overflow<\/a>.<br \/>\nIn conclusion, it is of utmost importance that users of the affected Tenda AC20 firmware version update to a patched version as soon as possible or apply a suitable WAF\/IDS to mitigate the risk temporarily.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview A significant weakness has been identified in Tenda AC20 16.03.08.05, a popular wireless router firmware. This vulnerability, designated as CVE-2025-9791, has far-reaching implications and could potentially lead to system compromise or data leakage. This issue particularly affects the file \/goform\/fromAdvSetMacMtuWan, which due to a flaw, could be manipulated to trigger a buffer overflow. It [&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-72113","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\/72113","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=72113"}],"version-history":[{"count":10,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/72113\/revisions"}],"predecessor-version":[{"id":81403,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/72113\/revisions\/81403"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=72113"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=72113"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=72113"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=72113"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=72113"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=72113"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=72113"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=72113"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=72113"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}