CVE-2021-42084: Zammad

Medium severity, CVSS 6.5. EPSS: 0.9% chance of exploitation in the next 30 days.

An issue was discovered in Zammad before 4.1.1. An attacker with valid agent credentials may send a series of crafted requests that cause an endless loop and thus cause denial of service.

Affected products

• Zammad Zammad: before 4.1.1 (fixed in 4.1.1)

Published 2021-10-07. Last modified 2026-06-17.