CVE-2020-10656: Proofpoint Insider Threat Management Server

Critical severity, CVSS 9.8. EPSS: 2.7% chance of exploitation in the next 30 days.

The Proofpoint Insider Threat Management Server (formerly ObserveIT Server) before 7.9.1 contains a vulnerability in the ITM application server's WriteWindowMouseWithChunksV2 API. The vulnerability allows an anonymous remote attacker to execute arbitrary code with local administrator privileges. The vulnerability is caused by improper deserialization.

Affected products

• Proofpoint Insider Threat Management Server: before 7.9.1 (fixed in 7.9.1)

Published 2021-01-06. Last modified 2026-06-17.