CVE-2020-5940 Cross-site scripting in BIG-IP

Medium 5.4 Published 5 Nov 2020 Updated 4 Aug 2024

Stored XSS in BIG-IP TMUI allows attackers to inject scripts, potentially leading to session hijacking or malicious actions.

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-2020-5940?

CVE-2020-5940 is a medium-severity cross-site scripting vulnerability in F5 Big-Ip Access Policy Manager, published on 5 Nov 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

In versions 16.0.0-16.0.0.1, 15.1.0-15.1.0.5, and 14.1.0-14.1.2.3, a stored cross-site scripting (XSS) vulnerability exists in an undisclosed page of the BIG-IP Traffic Management User Interface (TMUI), also known as the BIG-IP Configuration utility.

Weakness: CWE-79

Which versions are affected by CVE-2020-5940?

It affects 13 products.

Products include F5 Big-Ip Access Policy Manager, F5 Big-Ip Advanced Firewall Manager, F5 Big-Ip Analytics, F5 Big-Ip Application Acceleration Manager, F5 Big-Ip Application Security Manager, F5 Big-Ip Domain Name System and 7 more.

How do I fix CVE-2020-5940?

No fix has been published for CVE-2020-5940 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-2020-5940 being exploited?

There is no known exploitation of CVE-2020-5940 in the wild and no public exploit code.

All F5 Big-Ip Access Policy Manager vulnerabilities

Sources

Also known as GHSA-c5rx-w9gh-2543.