{"id":64184,"date":"2025-08-20T05:02:29","date_gmt":"2025-08-20T05:02:29","guid":{"rendered":""},"modified":"2025-09-03T19:04:33","modified_gmt":"2025-09-04T01:04:33","slug":"cve-2025-43986-unauthenticated-telnet-service-vulnerability-in-kuwfi-gc111-devices","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-43986-unauthenticated-telnet-service-vulnerability-in-kuwfi-gc111-devices\/","title":{"rendered":"<strong>CVE-2025-43986: Unauthenticated Telnet Service Vulnerability in KuWFi GC111 Devices<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>In this post, we will examine a critical vulnerability, CVE-2025-43986, discovered in the KuWFi GC111 GC111-GL-LM321_V3.0_20191211 devices. This vulnerability is particularly alarming due to its potential for system compromise or data leakage. KuWFi GC111 devices, used worldwide, have the TELNET service enabled by default and exposed over the WAN interface without authentication, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-50160-heap-based-buffer-overflow-in-windows-rras-posing-system-compromise-risk\/\"  data-wpil-monitor-id=\"78628\">posing a significant risk to users&#8217; data and system<\/a> security. It is crucial to address this issue promptly to prevent <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-27043-memory-corruption-vulnerability-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"75644\">potential attacks and protect your systems<\/a> and data.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-43986<br \/>\nSeverity: Critical (CVSS 9.8)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-27050-memory-corruption-vulnerability-leading-to-potential-system-compromise-and-data-leakage\/\"  data-wpil-monitor-id=\"74960\">Potential system compromise or data<\/a> leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-2073664041\" 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-2025-43984-unauthenticated-command-execution-vulnerability-in-kuwfi-gc111-devices\/\"  data-wpil-monitor-id=\"82396\">KuWFi GC111<\/a> | GC111-GL-LM321_V3.0_20191211<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The vulnerability lies in the default configuration of the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-30133-device-pairing-bypass-vulnerability-in-iroad-dashcam-fx2-devices\/\"  data-wpil-monitor-id=\"75643\">KuWFi GC111<\/a> devices, where the TELNET service is enabled by default and exposed over the WAN interface without requiring any authentication. This setup allows potential attackers to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47955-windows-remote-access-connection-manager-privilege-escalation-vulnerability\/\"  data-wpil-monitor-id=\"74016\">remotely access<\/a> the device over the internet via the telnet protocol. Since there is no authentication layer, the attacker can gain full control of the device, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-40741-stack-based-overflow-vulnerability-in-solid-edge-se2025-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"75776\">leading to system<\/a> compromise or data leakage.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-3889019807\" 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 this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-51390-command-injection-vulnerability-in-totolink-n600r\/\"  data-wpil-monitor-id=\"73772\">vulnerability might be exploited using telnet command<\/a>:<\/p>\n<pre><code class=\"\" data-line=\"\">telnet target_device_ip<\/code><\/pre>\n<p>In the above example, `target_device_ip` is the IP address of the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-53945-critical-command-injection-vulnerability-in-kuwfi-4g-ac900-lte-router\/\"  data-wpil-monitor-id=\"76528\">vulnerable KuWFi<\/a> GC111 device. Since the device does not require authentication for TELNET service, an attacker can directly <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-27212-command-injection-vulnerability-in-unifi-access-devices\/\"  data-wpil-monitor-id=\"74716\">access the device and execute shell commands<\/a>. This example illustrates the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-53546-high-severity-vulnerability-in-folo-s-github-workflow\/\"  data-wpil-monitor-id=\"73447\">severity of this vulnerability<\/a> and underscores the need for immediate remediation.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview In this post, we will examine a critical vulnerability, CVE-2025-43986, discovered in the KuWFi GC111 GC111-GL-LM321_V3.0_20191211 devices. This vulnerability is particularly alarming due to its potential for system compromise or data leakage. KuWFi GC111 devices, used worldwide, have the TELNET service enabled by default and exposed over the WAN interface without authentication, posing a [&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":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-64184","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/64184","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=64184"}],"version-history":[{"count":10,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/64184\/revisions"}],"predecessor-version":[{"id":74914,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/64184\/revisions\/74914"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=64184"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=64184"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=64184"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=64184"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=64184"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=64184"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=64184"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=64184"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=64184"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}