Is CVE-2021-27927 actively exploited?

No active exploitation of CVE-2021-27927 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-27927 be exploited remotely?

Yes. CVE-2021-27927 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-27927?

CVE-2021-27927 has a CVSS score of 8.8 (HIGH).

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HIGH

CVE-2021-27927

CWE-352Published: March 3, 2021· Updated: Jun 17, 2026

8.8

CVSS v3.1

Official Description

In Zabbix from 4.0.x before 4.0.28rc1, 5.0.0alpha1 before 5.0.10rc1, 5.2.x before 5.2.6rc1, and 5.4.0alpha1 before 5.4.0beta2, the CControllerAuthenticationUpdate controller lacks a CSRF protection mechanism. The code inside this controller calls diableSIDValidation inside the init() method. An attacker doesn't have to know Zabbix user login credentials, but has to know the correct Zabbix URL and contact information of an existing user with sufficient privileges.

NVD Source

Technical Analysis

CVE-2021-27927 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.