CVE-2022-29701: 
NixOS vulnerability analysis and mitigation

A lack of rate limiting in the 'forgot password' feature of Zammad v5.1.0 allows attackers to send an excessive amount of reset requests for a legitimate user, leading to a possible Denial of Service (DoS) via a large amount of generated e-mail messages. The vulnerability was discovered and disclosed in April 2022, identified as CVE-2022-29701, affecting Zammad version 5.1.0 (Zammad Advisory, NVD).

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:N/I:N/A:H. The issue stems from insufficient resource allocation controls, specifically the lack of rate limiting in the password reset functionality. This vulnerability is classified under CWE-770 (Allocation of Resources Without Limits or Throttling) (NVD).

The exploitation of this vulnerability can result in a Denial of Service condition through email flooding. When exploited, the system generates an excessive number of password reset emails, potentially overwhelming both the email delivery system and the victim's inbox, disrupting normal service operations (Zammad Advisory).

The vulnerability has been fixed in Zammad version 5.1.1. Users are recommended to upgrade to this version or later. The fix can be obtained through the official Zammad website, FTP server, or through the OS package manager (Zammad Advisory).