{"id":53723,"date":"2025-06-20T14:54:45","date_gmt":"2025-06-20T14:54:45","guid":{"rendered":""},"modified":"2025-06-29T17:18:54","modified_gmt":"2025-06-29T23:18:54","slug":"cve-2025-6121-critical-buffer-overflow-vulnerability-in-d-link-dir-632-fw103b08","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-6121-critical-buffer-overflow-vulnerability-in-d-link-dir-632-fw103b08\/","title":{"rendered":"<strong>CVE-2025-6121: Critical Buffer Overflow Vulnerability in D-Link DIR-632 FW103B08<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>An alarming cybersecurity vulnerability, classified as critical, has been identified in D-Link DIR-632 FW103B08. This flaw is coded as CVE-2025-6121 and affects the function get_pure_content of the HTTP POST request handler. This <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-31424-sql-injection-vulnerability-in-wp-lead-capturing-pages-plugin\/\"  data-wpil-monitor-id=\"60223\">vulnerability is severe as it can potentially lead<\/a> to a system compromise or data leakage, jeopardizing the privacy and security of users and businesses alike. Given the fact that the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-31059-sql-injection-vulnerability-in-wbw-product-table-pro\/\"  data-wpil-monitor-id=\"60214\">vulnerability affects products<\/a> no longer supported by the maintainer, this matter is further complicated, necessitating immediate and careful attention.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-6121<br \/>\nSeverity: Critical, with a CVSS score of 9.8<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: A successful exploitation of this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5853-critical-vulnerability-in-tenda-ac6-router-may-lead-to-system-compromise\/\"  data-wpil-monitor-id=\"60033\">vulnerability could lead to a complete system<\/a> compromise or potential data leakage.<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-808925503\" 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: 720px;\">\r\n  <h2 style=\"margin-top: 0; font-size: 22px; font-weight: 600; display: flex; align-items: center; letter-spacing: -0.02em;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"display: inline-flex; align-items: center; margin-right: 10px;\">\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: 42px; height: 42px;\" \/>\r\n    <\/a>\r\n    Share secrets securely\r\n  <\/h2>\r\n\r\n  <p style=\"margin-bottom: 14px; color: #d1d5db;\">\r\n    Ameeba is private infrastructure for communication and sensitive work built on encrypted identity instead of exposed corporate identity systems.\r\n  <\/p>\r\n\r\n  <p style=\"margin-bottom: 18px; color: #a1a1aa;\">\r\n    Passwords, credentials, confidential files, screenshots, internal discussions, sensitive AI context, and private coordination should not become exposed across ordinary communication platforms.\r\n  <\/p>\r\n\r\n  <ul style=\"list-style: none; padding-left: 0; margin-bottom: 24px; color: #e4e4e7;\">\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Encrypted identity<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Private Spaces for organizations and teams<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 End-to-end encrypted chat, calls, files, and notes<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Sensitive AI work and protected collaboration<\/li>\r\n    <li>\u2022 Built for information that cannot leak<\/li>\r\n  <\/ul>\r\n\r\n  <p style=\"font-style: italic; font-weight: 600; margin-bottom: 24px; color: #ffffff;\">\r\n    Our mission is to secure human work alongside AI.\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: 8px; font-weight: 500;\">\r\n      Download Ameeba\r\n    <\/a>\r\n\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"border: 1px solid #ffffff; color: #ffffff; padding: 10px 20px; text-decoration: none; border-radius: 8px; font-weight: 500;\">\r\n      Learn More\r\n    <\/a>\r\n  <\/div>\r\n<\/div><\/div>\n<p>Product | Affected Versions<\/p>\n<p><a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5912-critical-stack-based-buffer-overflow-in-d-link-dir-632-fw103b08\/\"  data-wpil-monitor-id=\"60697\">D-Link DIR-632<\/a> | FW103B08<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The vulnerability resides in the HTTP POST request handler of <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5969-critical-stack-based-buffer-overflow-vulnerability-in-d-link-dir-632-fw103b08\/\"  data-wpil-monitor-id=\"61108\">D-Link DIR-632<\/a> FW103B08. More specifically, the function get_pure_content is susceptible to manipulation via the Content-Length argument, resulting in a stack-based <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5851-critical-buffer-overflow-vulnerability-in-tenda-ac15-15-03-05-19-multi\/\"  data-wpil-monitor-id=\"60067\">buffer overflow<\/a>. This condition is often exploited to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47163-unauthorized-code-execution-through-microsoft-sharepoint-deserialization-vulnerability\/\"  data-wpil-monitor-id=\"60991\">execute arbitrary code<\/a> or cause a denial of service. The attack can be performed remotely, making it a crucial threat to any <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=\"60514\">systems running the vulnerable<\/a> software version.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-2064680752\" 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 is a conceptual example of how the vulnerability might be exploited. This example uses an <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-6162-critical-buffer-overflow-vulnerability-in-totolink-ex1200t-http-post-request-handler\/\"  data-wpil-monitor-id=\"62261\">HTTP POST request<\/a> with manipulated Content-Length:<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/get_pure_content HTTP\/1.1\nHost: vulnerable-device.example.com\nContent-Type: application\/x-www-form-urlencoded\nContent-Length: [manipulated value]\ndata=[malicious payload]<\/code><\/pre>\n<p>In the above example, the Content-Length value is manipulated to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5852-critical-buffer-overflow-vulnerability-in-tenda-ac6-15-03-05-16\/\"  data-wpil-monitor-id=\"60071\">overflow the buffer<\/a> in the get_pure_content function, potentially allowing for arbitrary code execution.<\/p>\n<p><strong>Mitigation Guidance<\/strong><\/p>\n<p>As the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-48281-critical-sql-injection-vulnerability-in-mystyle-custom-product-designer\/\"  data-wpil-monitor-id=\"60267\">products affected by this vulnerability<\/a> are no longer supported by the maintainer, the primary recommendation is to replace these devices with a newer, supported model where possible. If this is not immediately achievable, a temporary mitigation strategy would be to apply a vendor patch or employ a Web Application Firewall (WAF) or Intrusion Detection System (IDS). These protective measures can help <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-45984-critical-command-injection-vulnerability-detected-in-blink-routers\/\"  data-wpil-monitor-id=\"61368\">detect and prevent attacks leveraging this vulnerability<\/a> until a more permanent solution can be implemented.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview An alarming cybersecurity vulnerability, classified as critical, has been identified in D-Link DIR-632 FW103B08. This flaw is coded as CVE-2025-6121 and affects the function get_pure_content of the HTTP POST request handler. This vulnerability is severe as it can potentially lead to a system compromise or data leakage, jeopardizing the privacy and security of users [&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":[86,87,80],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-53723","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-buffer-overflow","attack_vector-dos","attack_vector-rce"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/53723","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=53723"}],"version-history":[{"count":12,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/53723\/revisions"}],"predecessor-version":[{"id":55957,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/53723\/revisions\/55957"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=53723"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=53723"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=53723"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=53723"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=53723"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=53723"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=53723"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=53723"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=53723"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}