CVE-2021-42084

MediumCVSS 6.5/10Last modified Jun 17, 2026

Description

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.

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-835

Affected software

No affected versions have been published.

Timeline

Published
Oct 7, 2021
Last modified
Jun 17, 2026
NVD status
Modified

Related CVEs from 2021

CVE-2021-420855.4An issue was discovered in Zammad before 4.1.1. There is stored XSS via a custom Avatar.CVE-2021-420868.8An issue was discovered in Zammad before 4.1.1. An Agent account can modify account data, and gain admin access, via a crafted request.CVE-2021-420874.9An issue was discovered in Zammad before 4.1.1. An admin can discover the application secret via the API.CVE-2021-420886.1An issue was discovered in Zammad before 4.1.1. The Chat functionality allows XSS because clipboard data is mishandled.CVE-2021-420897.5An issue was discovered in Zammad before 4.1.1. The REST API discloses sensitive information.CVE-2021-42096.5A NULL pointer dereference flaw was found in GnuTLS. As Nettle's hash update functions internally call memcpy, providing zero-length input mCVE-2021-420909.8An issue was discovered in Zammad before 4.1.1. The Form functionality allows remote code execution because deserialization is mishandled.CVE-2021-420919.1An issue was discovered in Zammad before 4.1.1. SSRF can occur via GitHub or GitLab integration.CVE-2021-420925.4An issue was discovered in Zammad before 4.1.1. Stored XSS may occur via an Article during addition of an attachment to a Ticket.CVE-2021-420937.2An issue was discovered in Zammad before 4.1.1. An admin can execute code on the server via a crafted request that manipulates triggers.CVE-2021-420949.8An issue was discovered in Zammad before 4.1.1. Command Injection can occur via custom Packages.CVE-2021-420957.5Xshell before 7.0.0.76 allows attackers to cause a crash by triggering rapid changes to the title bar.
CVE-2021-42084: Medium severity, CVSS 6.5 | Vulnix