CVE-2021-31521

Name: CVE-2021-31521
Creator: NVD / NIST
Published: 2021-06-17T12:15:07.933+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 1.40%

Last modified Jun 17, 2026

CVE-2021-31521 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. Trend Micro InterScan Web Security Virtual Appliance version 6.5 was found to have a reflected cross-site scripting (XSS) vulnerability in the product's Captive Portal.. EPSS estimates a 1.40% chance of exploitation in the next 30 days.

Description

Trend Micro InterScan Web Security Virtual Appliance version 6.5 was found to have a reflected cross-site scripting (XSS) vulnerability in the product's Captive Portal.

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

1.40%

69.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions	Update
Trendmicro	Interscan Web Security Virtual Appliance	6.5	Sp2

References

https://success.trendmicro.com/solution/000286452Patch, Vendor Advisory
https://success.trendmicro.com/solution/000286452Patch, Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-31521?

Trend Micro InterScan Web Security Virtual Appliance version 6.5 was found to have a reflected cross-site scripting (XSS) vulnerability in the product's Captive Portal.

How severe is CVE-2021-31521?

CVE-2021-31521 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 1.40% probability of exploitation in the next 30 days.

How do I fix CVE-2021-31521?

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-2021-31521?

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

Scan your code now

Source: NVD / NIST