Question: What is CVE-2025-20621?
Answer: CVE-2025-20621 is a vulnerability classified as medium with a CVSS score of 6.5. It falls under CWE-1287 and affects the system as follows: Mattermost versions 10.2.x <= 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly handle posts with attachments containing fields that cannot be cast to a String, which allows an attacker to cause the webapp to crash via creating and sending such a post to a channel.