CVE-2021-22157

Name: CVE-2021-22157
Creator: NVD / NIST
Published: 2021-04-06T21:15:14.347+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 1.95%

Last modified Jun 17, 2026

CVE-2021-22157 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. Proofpoint Insider Threat Management Server (formerly ObserveIT Server) before 7.11.1 allows stored XSS.. EPSS estimates a 1.95% chance of exploitation in the next 30 days.

Description

Proofpoint Insider Threat Management Server (formerly ObserveIT Server) before 7.11.1 allows stored XSS.

Metrics

CVSS 3.1

6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

1.95%

77.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Proofpoint	Insider Threat Management	>= 7.9.0, < 7.9.3
Proofpoint	Insider Threat Management	>= 7.10.0, < 7.10.3
Proofpoint	Insider Threat Management	>= 7.11.0, < 7.11.1

References

https://www.proofpoint.com/us/security/security-advisories/pfpt-sa-2021-0002Vendor Advisory
https://www.proofpoint.com/us/security/security-advisories/pfpt-sa-2021-0002Vendor Advisory

Timeline

Published: Apr 6, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-22157?

Proofpoint Insider Threat Management Server (formerly ObserveIT Server) before 7.11.1 allows stored XSS.

How severe is CVE-2021-22157?

CVE-2021-22157 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 1.95% probability of exploitation in the next 30 days.

How do I fix CVE-2021-22157?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-22157?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST