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HIGH · 7.5

CVE-2021-21005

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 c...

Vulnerability 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.

CVSS Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH

Affected Products

VendorProductVersions
PhoenixcontactFl Switch Smcs 16Tx Firmware<= 4.70
PhoenixcontactFl Switch Smcs 16Tx-
PhoenixcontactFl Switch Smcs 14Tx\/2Fx Firmware<= 4.70
PhoenixcontactFl Switch Smcs 14Tx\/2Fx-
PhoenixcontactFl Switch Smcs 14Tx\/2Fx-Sm Firmware<= 4.70
PhoenixcontactFl Switch Smcs 14Tx\/2Fx-Sm-
PhoenixcontactFl Switch Smcs 8Gt Firmware<= 4.70
PhoenixcontactFl Switch Smcs 8Gt-
PhoenixcontactFl Switch Smcs 6Gt\/2Sfp Firmware<= 4.70
PhoenixcontactFl Switch Smcs 6Gt\/2Sfp-
PhoenixcontactFl Switch Smcs 8Tx-Pn Firmware<= 4.70
PhoenixcontactFl Switch Smcs 8Tx-Pn-
PhoenixcontactFl Switch Smcs 4Tx-Pn Firmware<= 4.70
PhoenixcontactFl Switch Smcs 4Tx-Pn-
PhoenixcontactFl Switch Smcs 8Tx Firmware<= 4.70
PhoenixcontactFl Switch Smcs 8Tx-
PhoenixcontactFl Switch Smcs 6Tx\/2Sfp Firmware<= 4.70
PhoenixcontactFl Switch Smcs 6Tx\/2Sfp-
PhoenixcontactFl Switch Smn 6Tx\/2Pof-Pn Firmware<= 4.70
PhoenixcontactFl Switch Smn 6Tx\/2Pof-Pn-

Related Weaknesses (CWE)

CWE-362

References

FAQ

What is CVE-2021-21005?

CVE-2021-21005 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 c...

How severe is CVE-2021-21005?

CVE-2021-21005 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2021-21005?

Check the references section above for vendor advisories and patch information. Affected products include: Phoenixcontact Fl Switch Smcs 16Tx Firmware, Phoenixcontact Fl Switch Smcs 16Tx, Phoenixcontact Fl Switch Smcs 14Tx\/2Fx Firmware, Phoenixcontact Fl Switch Smcs 14Tx\/2Fx, Phoenixcontact Fl Switch Smcs 14Tx\/2Fx-Sm Firmware.