CVE-2021-21005 Race Condition Vulnerability in Phoenix Contact FL SWITCH SMCS series products
An attacker can crash Phoenix Contact FL SWITCH devices by sending a crafted TCP packet, requiring a reboot to restore service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-21005?
CVE-2021-21005 is a high-severity vulnerability in Phoenix Contact FL NAT, published on 25 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In Phoenix Contact FL SWITCH SMCS series products in multiple versions if an attacker sends a hand-crafted TCP-Packet with the Urgent-Flag set and the Urgent-Pointer set to 0, the network stack will crash. The device needs to be rebooted afterwards.
Weakness: CWE-362
Which versions are affected by CVE-2021-21005?
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-2021-21005?
No fix has been published for CVE-2021-21005 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-21005 being exploited?
There is no known exploitation of CVE-2021-21005 in the wild and no public exploit code.
Other vulnerabilities in Phoenix Contact FL NAT
Sources
Also known as GHSA-jmcx-w32h-8qj4.