{"id":54130,"date":"2025-06-22T22:20:05","date_gmt":"2025-06-22T22:20:05","guid":{"rendered":""},"modified":"2025-06-26T11:19:10","modified_gmt":"2025-06-26T17:19:10","slug":"cve-2025-6151-critical-remote-buffer-overflow-vulnerability-in-tp-link-tl-wr940n","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-6151-critical-remote-buffer-overflow-vulnerability-in-tp-link-tl-wr940n\/","title":{"rendered":"<strong>CVE-2025-6151: Critical Remote Buffer Overflow Vulnerability in TP-Link TL-WR940N<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>A critical vulnerability denominated CVE-2025-6151, has been publicly disclosed and poses a significant risk to TP-Link TL-WR940N V4 router users. This vulnerability affects an unknown functionality of the file \/userRpm\/WanSlaacCfgRpm.htm and could potentially lead to system compromise or data leakage. Due to the high <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-30220-high-severity-xml-external-entity-xxe-vulnerability-in-geoserver-geotools-and-geonetwork\/\"  data-wpil-monitor-id=\"60582\">severity of this vulnerability<\/a>, it is crucial for users and administrators to understand the nature of this security flaw and take immediate steps to mitigate its impact.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-6151<br \/>\nSeverity: Critical (CVSS: 8.8)<br \/>\nAttack Vector: Remote<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: No user interaction required<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-40912-critical-vulnerability-in-cryptx-for-perl-allows-potential-system-compromise\/\"  data-wpil-monitor-id=\"60776\">Potential system<\/a> compromise and data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-844623692\" 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>TP-Link TL-WR940N | V4<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-34711-improper-uri-validation-vulnerability-in-geoserver\/\"  data-wpil-monitor-id=\"60404\">vulnerability stems from an improper validation<\/a> of the &#8216;dnsserver1&#8217; argument within the \/userRpm\/WanSlaacCfgRpm.htm file. A <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-33064-heap-based-buffer-overflow-vulnerability-in-windows-routing-and-remote-access-service-rras\/\"  data-wpil-monitor-id=\"60841\">remote attacker can exploit this vulnerability<\/a> by sending a specifically crafted request that includes an oversized &#8216;dnsserver1&#8217; argument. This triggers a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5902-critical-buffer-overflow-vulnerability-in-totolink-t10\/\"  data-wpil-monitor-id=\"60563\">buffer overflow<\/a> condition in the router&#8217;s firmware leading to potential system compromise and data leakage.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-4087980339\" 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>The following 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=\"60918\">attacker might exploit<\/a> the vulnerability. Note that this is not a real exploit, but a representation of how the attack could theoretically occur.<\/p>\n<pre><code class=\"\" data-line=\"\">GET \/userRpm\/WanSlaacCfgRpm.htm?dnsserver1=AAAAAAAA...[1K A&#039;s]...AAAA HTTP\/1.1\nHost: [Router IP]<\/code><\/pre>\n<p>In this example, &#8216;AAAAAAAA&#8230;[1K A&#8217;s]&#8230;AAAA&#8217; represents an oversized &#8216;dnsserver1&#8217; argument that is sent to the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5901-buffer-overflow-vulnerability-in-totolink-t10-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"60507\">vulnerable endpoint causing the buffer overflow<\/a>.<\/p>\n<p><strong>Mitigation Guidance<\/strong><\/p>\n<p>Users are strongly advised to apply the vendor&#8217;s patch to fix this vulnerability. In case the patch cannot be immediately applied, use of a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation method. Additionally, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5485-a-critical-vulnerability-pertaining-to-user-name-enumeration-in-web-management-interfaces\/\"  data-wpil-monitor-id=\"61504\">users should consider disabling remote management<\/a> of the router if it is not required, as the attack can be launched remotely.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview A critical vulnerability denominated CVE-2025-6151, has been publicly disclosed and poses a significant risk to TP-Link TL-WR940N V4 router users. This vulnerability affects an unknown functionality of the file \/userRpm\/WanSlaacCfgRpm.htm and could potentially lead to system compromise or data leakage. Due to the high severity of this vulnerability, it is crucial for users and [&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-54130","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\/54130","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=54130"}],"version-history":[{"count":8,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/54130\/revisions"}],"predecessor-version":[{"id":55195,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/54130\/revisions\/55195"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=54130"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=54130"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=54130"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=54130"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=54130"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=54130"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=54130"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=54130"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=54130"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}