Is CVE-2021-22158 actively exploited?

No active exploitation of CVE-2021-22158 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-22158 be exploited remotely?

Yes. CVE-2021-22158 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-22158?

CVE-2021-22158 has a CVSS score of 7.2 (HIGH).

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HIGH

CVE-2021-22158

CWE-611Published: April 6, 2021· Updated: Jun 17, 2026

7.2

CVSS v3.1

Official Description

The Proofpoint Insider Threat Management Server (formerly ObserveIT Server) is vulnerable to XML external entity (XXE) injection in the Web Console. The vulnerability requires admin user privileges and knowledge of the XML file's encryption key to successfully exploit. All versions before 7.11 are affected.

NVD Source

Technical Analysis

CVE-2021-22158 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

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

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 7.2.