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.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-27899
• https://www.proofpoint.com/us/security/security-advisories/pfpt-sa-2021-0004