Is CVE-2021-27900 actively exploited?

No active exploitation of CVE-2021-27900 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-27900 be exploited remotely?

Yes. CVE-2021-27900 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-27900?

CVE-2021-27900 has a CVSS score of 8.1 (HIGH).

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HIGH

CVE-2021-27900

CWE-862Published: April 6, 2021· Updated: Jun 17, 2026

8.1

CVSS v3.1

Official Description

The Proofpoint Insider Threat Management Server (formerly ObserveIT Server) is missing an authorization check on several pages in the Web Console. This enables a view-only user to change any configuration setting and delete any registered agents. All versions before 7.11.1 are affected.

NVD Source

Technical Analysis

CVE-2021-27900 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 full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.1.