CVE-2021-21003 Denial of Service Vulnerability in Phoenix Contact FL SWITCH SMCS series products
Attackers can cause denial of service for web, SNMP, and ICMP services on Phoenix Contact switches by sending fragmented TCP packets.
- 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-2021-21003?
CVE-2021-21003 is a medium-severity denial of service 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 fragmented TCP-Packets may cause a Denial of Service of Web-, SNMP- and ICMP-Echo services. The switching functionality of the device is not affected.
Weakness: CWE-404
Which versions are affected by CVE-2021-21003?
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-2021-21003?
No fix has been published for CVE-2021-21003 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-21003 being exploited?
There is no known exploitation of CVE-2021-21003 in the wild and no public exploit code.
Other vulnerabilities in Phoenix Contact FL NAT
Sources
Also known as GHSA-4567-7fw8-972r.