What’s Vulnerable › Vulnerabilities

CVE-2021-27899

• Severity: high (CVSS 7.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-04-06 · updated 2026-06-17
• Weakness: CWE-295

Description

The Proofpoint Insider Threat Management Agents (formerly ObserveIT Agent) for MacOS and Linux perform improper validation of the ITM Server's certificate, which enables a remote attacker to intercept and alter these communications using a man-in-the-middle attack. All versions before 7.11.1 are affected. Agents for Windows and Cloud are not affected.

Affected products

• Proofpoint Insider Threat Management: from 7.9.0 before 7.9.3; from 7.10.0 before 7.10.3; from 7.11.0 before 7.11.1 — fixed in 7.10.3, 7.11.1, 7.9.3

How to fix

Upgrade to a fixed version: Proofpoint Insider Threat Management 7.10.3, 7.11.1, 7.9.3. Check the vendor advisory for mitigations.

References

• https://www.proofpoint.com/us/security/security-advisories/pfpt-sa-2021-0004
• https://www.proofpoint.com/us/security/security-advisories/pfpt-sa-2021-0004

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