CVE-2021-21441: 
Linux Debian vulnerability analysis and mitigation

A Cross-Site Scripting (XSS) vulnerability was discovered in the ticket overview screens of OTRS (Open-Source Ticket Request System). The vulnerability, identified as CVE-2021-21441, was disclosed on June 16, 2021. This vulnerability affects OTRS AG ((OTRS)) Community Edition 6.0.x version 6.0.1 and later versions, as well as OTRS AG OTRS 7.0.x version 7.0.26 and prior versions (OTRS Advisory).

The vulnerability exists in the ticket overview screens where an attacker can collect various information through emails displayed in the overview screen. The attack vector involves sending specially crafted emails to the system, requiring no user interaction for exploitation. The vulnerability has been assigned a CVSS v3.1 base score of 7.5 (HIGH) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N, indicating network accessibility, low attack complexity, no privileges required, and no user interaction needed (OTRS Advisory).

The vulnerability allows attackers to collect various information from the system through the ticket overview screens. The high CVSS score indicates significant potential for information disclosure, though there is no direct impact on system integrity or availability (OTRS Advisory).

The vulnerability has been fixed in OTRS version 7.0.27. Organizations using affected versions should upgrade to this patched version to mitigate the risk. The fix was released as part of the security advisory OSA-2021-11 (OTRS Advisory, Debian Advisory).