{"id":36023,"date":"2025-05-07T10:32:36","date_gmt":"2025-05-07T10:32:36","guid":{"rendered":""},"modified":"2025-09-29T02:50:27","modified_gmt":"2025-09-29T08:50:27","slug":"cve-2025-4140-critical-remote-buffer-overflow-vulnerability-in-netgear-ex6120-1-0-3-94","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-4140-critical-remote-buffer-overflow-vulnerability-in-netgear-ex6120-1-0-3-94\/","title":{"rendered":"<strong>CVE-2025-4140: Critical Remote Buffer Overflow Vulnerability in Netgear EX6120 1.0.3.94<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>The cybersecurity landscape is fraught with ever-evolving threats and vulnerabilities. One such vulnerability is CVE-2025-4140, a critical buffer overflow issue found in Netgear EX6120 1.0.3.94. This vulnerability, affecting the function sub_30394, has the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2021-40367-critical-vulnerability-in-syngo-fastview-allows-potential-system-compromise\/\"  data-wpil-monitor-id=\"40927\">potential to compromise the entire system<\/a> or lead to significant data leakage. The seriousness of this vulnerability lies in the fact that the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-3200-unauthenticated-remote-attacker-exploiting-insecure-tls-protocols\/\"  data-wpil-monitor-id=\"40761\">attack can be initiated remotely<\/a>, posing a severe threat to systems worldwide. Despite the early disclosure to the vendor, no response or remediation measures have been provided yet.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-4140<br \/>\nSeverity: Critical (CVSS 8.8)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: System compromise, potential <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-50612-escalation-of-privileges-and-data-leakage-in-fit2cloud-cloud-explorer-lite\/\"  data-wpil-monitor-id=\"41275\">data leakage<\/a><\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-3527484070\" 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-2025-4139-critical-buffer-overflow-vulnerability-in-netgear-ex6120-1-0-0-68\/\"  data-wpil-monitor-id=\"42398\">Netgear EX6120<\/a> | 1.0.3.94<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-4116-critical-buffer-overflow-vulnerability-in-netgear-jwnr2000v2-1-0-0-11\/\"  data-wpil-monitor-id=\"42215\">vulnerability stems from the function sub_30394 in Netgear<\/a> EX6120 1.0.3.94, which fails to properly handle certain arguments related to the host. An attacker can exploit this issue by sending manipulated host arguments, causing the system to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-3785-critical-buffer-overflow-vulnerability-in-d-link-dwr-m961\/\"  data-wpil-monitor-id=\"41001\">overflow its buffer<\/a>. This overflow can then enable an attacker to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-46661-unauthenticated-remote-code-execution-vulnerability-in-ipw-systems-metazo\/\"  data-wpil-monitor-id=\"40721\">execute arbitrary code on the system<\/a>, possibly leading to full system control or data leakage. The risk is compounded by the fact that the attack can be launched remotely, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2021-42028-critical-vulnerability-in-syngo-fastview-allowing-remote-code-execution\/\"  data-wpil-monitor-id=\"40868\">allowing attackers to exploit this vulnerability<\/a> from anywhere in the world.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-3560719758\" 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 the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47154-exploitation-of-use-after-free-vulnerability-in-libjs-in-ladybird\/\"  data-wpil-monitor-id=\"42399\">vulnerability might be exploited<\/a>. This is not a real exploit, but a representation of how an HTTP request might be manipulated to trigger the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-34325-buffer-overflow-vulnerability-in-libfsimage\/\"  data-wpil-monitor-id=\"41021\">buffer overflow<\/a>.<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/sub_30394\/function HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/json\n{\n&quot;host&quot;: &quot;&lt;malicious_payload&gt;&quot;\n}<\/code><\/pre>\n<p>In this example, &#8220; represents a specially crafted string designed to overflow the buffer, leading to potential <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-45947-arbitrarily-executable-code-vulnerability-in-online-banquet-booking-system-v1-2\/\"  data-wpil-monitor-id=\"40825\">execution of arbitrary code or system<\/a> compromise. It is crucial to patch this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-54742-data-deserialization-vulnerability-in-wpevently-leading-to-possible-system-compromise\/\"  data-wpil-monitor-id=\"86445\">vulnerability as soon as possible<\/a> or employ WAF\/IDS as a temporary mitigation measure until the vendor responds with a proper fix.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview The cybersecurity landscape is fraught with ever-evolving threats and vulnerabilities. One such vulnerability is CVE-2025-4140, a critical buffer overflow issue found in Netgear EX6120 1.0.3.94. This vulnerability, affecting the function sub_30394, has the potential to compromise the entire system or lead to significant data leakage. The seriousness of this vulnerability lies in the fact [&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-36023","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\/36023","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=36023"}],"version-history":[{"count":11,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/36023\/revisions"}],"predecessor-version":[{"id":79242,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/36023\/revisions\/79242"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=36023"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=36023"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=36023"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=36023"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=36023"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=36023"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=36023"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=36023"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=36023"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}