Is CVE-2021-42084 actively exploited?

No active exploitation of CVE-2021-42084 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-42084 be exploited remotely?

Yes. CVE-2021-42084 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-42084?

CVE-2021-42084 has a CVSS score of 6.5 (MEDIUM).

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MEDIUM

CVE-2021-42084

CWE-835Published: October 7, 2021· Updated: Jun 17, 2026

6.5

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-42084 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 6.5.