{"id":71145,"date":"2025-09-04T03:42:23","date_gmt":"2025-09-04T03:42:23","guid":{"rendered":""},"modified":"2025-09-28T05:36:53","modified_gmt":"2025-09-28T11:36:53","slug":"cve-2025-30256-denial-of-service-vulnerability-in-tenda-ac6-s-http-header-parsing-functionality","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-30256-denial-of-service-vulnerability-in-tenda-ac6-s-http-header-parsing-functionality\/","title":{"rendered":"<strong>CVE-2025-30256: Denial of Service Vulnerability in Tenda AC6&#8217;s HTTP Header Parsing Functionality<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>The cybersecurity world is continuously evolving, and with it comes an alarming rise in vulnerabilities. One such vulnerability that has come to light recently is CVE-2025-30256. This <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49661-untrusted-pointer-dereference-vulnerability-in-windows-ancillary-function-driver-for-winsock\/\"  data-wpil-monitor-id=\"80372\">vulnerability resides in the HTTP Header Parsing functionality<\/a> of the Tenda AC6 V5.0 V02.03.01.110, a widely used router. The flaw can be exploited to cause a Denial of Service (DoS) condition, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-23311-stack-overflow-vulnerability-in-nvidia-triton-inference-server-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"78803\">potentially leading to system<\/a> compromise or data leakage. The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-8901-high-severity-out-of-bounds-write-vulnerability-in-angle-google-chrome\/\"  data-wpil-monitor-id=\"78823\">severity of this vulnerability<\/a> and its widespread impact necessitate immediate attention and proactive mitigation.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-30256<br \/>\nSeverity: High (CVSS: 8.6)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: Denial of Service, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-42957-critical-backdoor-vulnerability-in-sap-s-4hana-exposes-systems-to-potential-compromise\/\"  data-wpil-monitor-id=\"79606\">Potential System<\/a> Compromise, and Data Leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-1345843936\" 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-2025-27129-authentication-bypass-vulnerability-in-tenda-ac6-v5-0-v02-03-01-110\/\"  data-wpil-monitor-id=\"82190\">Tenda AC6 | V5.0<\/a> V02.03.01.110<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The exploit works by having an attacker send a specially crafted series of HTTP requests to the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-55708-sql-injection-vulnerability-in-expresstech-systems-quiz-and-survey-master\/\"  data-wpil-monitor-id=\"79120\">vulnerable system<\/a>. These malformed requests trigger a fault in the HTTP Header Parsing functionality of the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-32010-stack-based-buffer-overflow-vulnerability-in-tenda-ac6-cloud-api\/\"  data-wpil-monitor-id=\"85066\">Tenda AC6<\/a> router. The system is unable to handle these malformed requests, <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=\"79734\">leading to a reboot of the system<\/a>. This reboot can disrupt services and opens an opportunity for further exploitation, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-7384-php-object-injection-vulnerability-in-wordpress-plugin-leads-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"79048\">potentially leading to system<\/a> compromise or data leakage.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-2430711712\" 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 such a malformed HTTP <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-52797-critical-cross-site-request-forgery-csrf-vulnerability-in-josepsitjar-storymap\/\"  data-wpil-monitor-id=\"79375\">request that could exploit this vulnerability<\/a>:<\/p>\n<pre><code class=\"\" data-line=\"\">GET \/ HTTP\/1.1\nHost: target.example.com\nAccept-Encoding: gzip, deflate\nAccept: *\/*\nAccept-Language: en\nUser-Agent: Mozilla\/5.0 (Windows NT 10.0; Win64; x64)\nConnection: keep-alive\nContent-Length: 99999999999<\/code><\/pre>\n<p>In this example, the &#8220;Content-Length&#8221; header is set to an excessively high value. The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-54788-sql-injection-vulnerability-in-suitecrm-leading-to-potential-system-compromise-or-data-leakage\/\"  data-wpil-monitor-id=\"80211\">system attempts to allocate memory for the incoming data<\/a> based on the &#8220;Content-Length&#8221; value. However, the excessive value <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-21125-serious-memory-corruption-vulnerability-leading-to-local-privilege-escalation\/\"  data-wpil-monitor-id=\"86044\">leads to memory<\/a> exhaustion, causing the system to reboot.<\/p>\n<p><strong>Mitigation Guidance<\/strong><\/p>\n<p>To mitigate this vulnerability, users are advised to apply the vendor-provided patch as soon as possible. If a patch is not yet available or cannot be applied immediately, users can use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to block or alert on suspicious <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-55293-high-risk-vulnerability-in-meshtastic-s-mesh-networking-solution\/\"  data-wpil-monitor-id=\"81338\">network traffic patterns associated with this vulnerability<\/a>. These systems can serve as a temporary mitigation measure until the patch can be applied.<br \/>\nRemember, staying updated with patches and employing robust security measures is the first line of defense against such vulnerabilities.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview The cybersecurity world is continuously evolving, and with it comes an alarming rise in vulnerabilities. One such vulnerability that has come to light recently is CVE-2025-30256. This vulnerability resides in the HTTP Header Parsing functionality of the Tenda AC6 V5.0 V02.03.01.110, a widely used router. The flaw can be exploited to cause a Denial [&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":[82],"product":[],"attack_vector":[87],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-71145","post","type-post","status-publish","format-standard","hentry","category-uncategorized","vendor-microsoft","attack_vector-dos"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/71145","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=71145"}],"version-history":[{"count":13,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/71145\/revisions"}],"predecessor-version":[{"id":78838,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/71145\/revisions\/78838"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=71145"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=71145"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=71145"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=71145"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=71145"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=71145"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=71145"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=71145"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=71145"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}