CVE-2021-40377

Name: CVE-2021-40377
Creator: NVD / NIST
Published: 2021-09-08T11:15:07.53+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.45%

Last modified Jun 17, 2026

CVE-2021-40377 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. SmarterTools SmarterMail 16.x before build 7866 has stored XSS. The application fails to sanitize email content, thus allowing one to inject HTML and/or JavaScript into a page that will then be processed and stored by the application.. EPSS estimates a 0.45% chance of exploitation in the next 30 days.

Description

SmarterTools SmarterMail 16.x before build 7866 has stored XSS. The application fails to sanitize email content, thus allowing one to inject HTML and/or JavaScript into a page that will then be processed and stored by the application.

Metrics

CVSS 3.1

5.4/10

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

EPSS Probability

0.45%

35.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Smartertools	Smartermail	>= 16.0.6345, < 16.3.7866

References

https://www.smartertools.com/smartermail/release-notes/currentRelease Notes, Vendor Advisory
https://www.smartertools.com/smartermail/release-notes/currentRelease Notes, Vendor Advisory

Timeline

Published: Sep 8, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-40377?

How severe is CVE-2021-40377?

CVE-2021-40377 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.45% probability of exploitation in the next 30 days.

How do I fix CVE-2021-40377?

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-2021-40377?

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

Scan your code now

Source: NVD / NIST