CVE-2021-21004 Cross-site Scripting Vulnerability in Phoenix Contact FL SWITCH SMCS series products
Attackers can inject malicious code via LLDP frames into the web management interface, allowing execution in the client's browser.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-21004?
CVE-2021-21004 is a high-severity cross-site scripting vulnerability in Phoenix Contact FL NAT, published on 25 Jun 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
In Phoenix Contact FL SWITCH SMCS series products in multiple versions an attacker may insert malicious code via LLDP frames into the web-based management which could then be executed by the client.
Weakness: CWE-79
Which versions are affected by CVE-2021-21004?
It affects 15 products.
Products include Phoenixcontact Fl Nat Smn 8tx-M Firmware, Phoenixcontact Fl Nat Smn 8tx Firmware, Phoenixcontact Fl Switch Smcs 14tx\/2fx-Sm Firmware, Phoenixcontact Fl Switch Smcs 14tx\/2fx Firmware, Phoenixcontact Fl Switch Smcs 16tx Firmware, Phoenixcontact Fl Switch Smcs 4tx-Pn Firmware and 9 more.
How do I fix CVE-2021-21004?
No fix has been published for CVE-2021-21004 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-2021-21004 being exploited?
There is no known exploitation of CVE-2021-21004 in the wild and no public exploit code.
Other vulnerabilities in Phoenix Contact FL NAT
Sources
Also known as GHSA-p92q-6vw3-958m.