Is CVE-2021-21435 actively exploited?

No active exploitation of CVE-2021-21435 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-21435 be exploited remotely?

Yes. CVE-2021-21435 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-21435?

CVE-2021-21435 has a CVSS score of 6.5 (MEDIUM).

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MEDIUM

CVE-2021-21435

CWE-200Published: February 8, 2021· Updated: Jun 17, 2026

6.5

CVSS v3.1

Official Description

Article Bcc fields and agent personal information are shown when customer prints the ticket (PDF) via external interface. This issue affects: OTRS AG OTRS 7.0.x version 7.0.23 and prior versions; 8.0.x version 8.0.10 and prior versions.

NVD Source

Technical Analysis

CVE-2021-21435 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), with a CVSS base score of 6.5.

From a weakness classification perspective (CWE-200): Information exposure vulnerabilities leak sensitive data to unauthorized actors.