CVE-2021-21005

moderate-risk
Published 2021-06-25

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.

Do I need to act?

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0.04% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.5/10 High
NETWORK / LOW complexity

Affected Products (15)

Fl Switch Smcs 16Tx Firmware
Fl Switch Smcs 14Tx\/2Fx Firmware
Fl Switch Smcs 14Tx\/2Fx-Sm Firmware
Fl Switch Smcs 8Gt Firmware
Fl Switch Smcs 6Gt\/2Sfp Firmware
Fl Switch Smcs 8Tx-Pn Firmware
Fl Switch Smcs 4Tx-Pn Firmware
Fl Switch Smcs 8Tx Firmware
Fl Switch Smcs 6Tx\/2Sfp Firmware
Fl Switch Smn 6Tx\/2Pof-Pn Firmware
Fl Switch Smn 8Tx-Pn Firmware
Fl Switch Smn 6Tx\/2Fx Firmware
Fl Switch Smn 6Tx\/2Fx Sm Firmware
Fl Nat Smn 8Tx Firmware
Fl Nat Smn 8Tx-M Firmware

Affected Vendors

Phoenixcontact

References (2)

Third Party Advisory https://cert.vde.com/en-us/advisories/vde-2021-023
Third Party Advisory https://cert.vde.com/en-us/advisories/vde-2021-023
44
/ 100
moderate-risk
Severity 26/34 · High
Exploitability 0/34 · Minimal
Exposure 18/34 · Moderate