CVE-2021-31521 Cross-site scripting in Trend Micro InterScan Web Security Virtual Appliance

Medium 5.4 Published 17 Jun 2021 Updated 3 Aug 2024

Reflected XSS in Trend Micro InterScan Web Security Virtual Appliance allows attackers to execute scripts in user browsers via the Captive Portal.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2021-31521?

CVE-2021-31521 is a medium-severity cross-site scripting vulnerability in Trend Micro InterScan Web Security Virtual Appliance, published on 17 Jun 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official 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.

Weakness: CWE-79

Which versions are affected by CVE-2021-31521?

It affects 1 product.

Products include Trendmicro Interscan Web Security Virtual Appliance.

How do I fix CVE-2021-31521?

No fix has been published for CVE-2021-31521 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2021-31521 being exploited?

There is no known exploitation of CVE-2021-31521 in the wild and no public exploit code.

Sources

Also known as GHSA-2fwg-qc8c-frhr.