CVE-2021-42770 Cross-site scripting in n/a

Medium 6.1 Published 8 Nov 2021 Updated 4 Aug 2024

An XSS vulnerability in OPNsense allows attackers to inject scripts via LDAP attributes, potentially leading to session hijacking or code execution.

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

What is CVE-2021-42770?

CVE-2021-42770 is a medium-severity cross-site scripting vulnerability in n/a, published on 8 Nov 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

A Cross-site scripting (XSS) vulnerability was discovered in OPNsense before 21.7.4 via the LDAP attribute return in the authentication tester.

Weakness: CWE-79

Which versions are affected by CVE-2021-42770?

It affects 1 product.

Products include Opnsense Opnsense.

How do I fix CVE-2021-42770?

No fix has been published for CVE-2021-42770 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-2021-42770 being exploited?

There is no known exploitation of CVE-2021-42770 in the wild and no public exploit code.

Sources

Also known as GHSA-r32j-xgg3-w2rw.