CVE-2021-21005: Race Condition Vulnerability in Phoenix Contact FL SWITCH SMCS series products
First published: Fri Jun 25 2021(Updated: )
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.
Credit: info@cert.vde.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Phoenixcontact Fl Switch Smcs 16tx Firmware | <=4.70 | |
| Phoenixcontact Fl Switch Smcs 16tx | ||
| Phoenixcontact Fl Switch Smcs 14tx\/2fx Firmware | <=4.70 | |
| Phoenixcontact Fl Switch Smcs 14tx\/2fx | ||
| Phoenixcontact Fl Switch Smcs 14tx\/2fx-sm Firmware | <=4.70 | |
| Phoenixcontact Fl Switch Smcs 14tx\/2fx-sm | ||
| Phoenixcontact Fl Switch Smcs 8gt Firmware | <=4.70 | |
| Phoenixcontact Fl Switch Smcs 8gt | ||
| Phoenixcontact Fl Switch Smcs 6gt\/2sfp Firmware | <=4.70 | |
| Phoenixcontact Fl Switch Smcs 6gt\/2sfp | ||
| Phoenixcontact Fl Switch Smcs 8tx-pn Firmware | <=4.70 | |
| Phoenixcontact Fl Switch Smcs 8tx-pn | ||
| Phoenixcontact Fl Switch Smcs 4tx-pn Firmware | <=4.70 | |
| Phoenixcontact Fl Switch Smcs 4tx-pn | ||
| Phoenixcontact Fl Switch Smcs 8tx Firmware | <=4.70 | |
| Phoenixcontact Fl Switch Smcs 8tx | ||
| Phoenixcontact Fl Switch Smcs 6tx\/2sfp Firmware | <=4.70 | |
| Phoenixcontact Fl Switch Smcs 6tx\/2sfp | ||
| Phoenixcontact Fl Switch Smn 6tx\/2pof-pn Firmware | <=4.70 | |
| Phoenixcontact Fl Switch Smn 6tx\/2pof-pn | ||
| Phoenixcontact Fl Switch Smn 8tx-pn Firmware | <=4.70 | |
| Phoenixcontact Fl Switch Smn 8tx-pn | ||
| Phoenixcontact Fl Switch Smn 6tx\/2fx Firmware | <=4.70 | |
| Phoenixcontact Fl Switch Smn 6tx\/2fx | ||
| Phoenixcontact Fl Switch Smn 6tx\/2fx Sm Firmware | <=4.70 | |
| Phoenixcontact Fl Switch Smn 6tx\/2fx Sm | ||
| Phoenixcontact Fl Nat Smn 8tx Firmware | <=4.63 | |
| Phoenixcontact Fl Nat Smn 8tx | ||
| Phoenixcontact Fl Nat Smn 8tx-m Firmware | <=4.63 | |
| Phoenixcontact Fl Nat Smn 8tx-m |
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Reference Links
Frequently Asked Questions
What is the vulnerability ID for this issue?
The vulnerability ID for this issue is CVE-2021-21005.
What is the severity of CVE-2021-21005?
CVE-2021-21005 has a severity of 7.5 (High).
Which products are affected by CVE-2021-21005?
Phoenix Contact FL SWITCH SMCS series products in multiple versions are affected.
How does the vulnerability in CVE-2021-21005 exploit the network stack?
An attacker can crash the network stack by sending a hand-crafted TCP packet with the Urgent-Flag set and the Urgent-Pointer set to 0.
What is the recommended action to fix CVE-2021-21005?
To fix CVE-2021-21005, the affected device needs to be rebooted.
- collector/nvd-index
- agent/type
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- agent/severity
- agent/title
- agent/weakness
- agent/references
- agent/author
- agent/last-modified-date
- agent/event
- agent/tags
- agent/description
- agent/first-publish-date
- vendor/phoenixcontact
- canonical/phoenixcontact fl switch smcs 16tx firmware
- version/phoenixcontact fl switch smcs 16tx firmware/4.70
- canonical/phoenixcontact fl switch smcs 16tx
- canonical/phoenixcontact fl switch smcs 14tx\/2fx firmware
- version/phoenixcontact fl switch smcs 14tx\/2fx firmware/4.70
- canonical/phoenixcontact fl switch smcs 14tx\/2fx
- canonical/phoenixcontact fl switch smcs 14tx\/2fx-sm firmware
- version/phoenixcontact fl switch smcs 14tx\/2fx-sm firmware/4.70
- canonical/phoenixcontact fl switch smcs 14tx\/2fx-sm
- canonical/phoenixcontact fl switch smcs 8gt firmware
- version/phoenixcontact fl switch smcs 8gt firmware/4.70
- canonical/phoenixcontact fl switch smcs 8gt
- canonical/phoenixcontact fl switch smcs 6gt\/2sfp firmware
- version/phoenixcontact fl switch smcs 6gt\/2sfp firmware/4.70
- canonical/phoenixcontact fl switch smcs 6gt\/2sfp
- canonical/phoenixcontact fl switch smcs 8tx-pn firmware
- version/phoenixcontact fl switch smcs 8tx-pn firmware/4.70
- canonical/phoenixcontact fl switch smcs 8tx-pn
- canonical/phoenixcontact fl switch smcs 4tx-pn firmware
- version/phoenixcontact fl switch smcs 4tx-pn firmware/4.70
- canonical/phoenixcontact fl switch smcs 4tx-pn
- canonical/phoenixcontact fl switch smcs 8tx firmware
- version/phoenixcontact fl switch smcs 8tx firmware/4.70
- canonical/phoenixcontact fl switch smcs 8tx
- canonical/phoenixcontact fl switch smcs 6tx\/2sfp firmware
- version/phoenixcontact fl switch smcs 6tx\/2sfp firmware/4.70
- canonical/phoenixcontact fl switch smcs 6tx\/2sfp
- canonical/phoenixcontact fl switch smn 6tx\/2pof-pn firmware
- version/phoenixcontact fl switch smn 6tx\/2pof-pn firmware/4.70
- canonical/phoenixcontact fl switch smn 6tx\/2pof-pn
- canonical/phoenixcontact fl switch smn 8tx-pn firmware
- version/phoenixcontact fl switch smn 8tx-pn firmware/4.70
- canonical/phoenixcontact fl switch smn 8tx-pn
- canonical/phoenixcontact fl switch smn 6tx\/2fx firmware
- version/phoenixcontact fl switch smn 6tx\/2fx firmware/4.70
- canonical/phoenixcontact fl switch smn 6tx\/2fx
- canonical/phoenixcontact fl switch smn 6tx\/2fx sm firmware
- version/phoenixcontact fl switch smn 6tx\/2fx sm firmware/4.70
- canonical/phoenixcontact fl switch smn 6tx\/2fx sm
- canonical/phoenixcontact fl nat smn 8tx firmware
- version/phoenixcontact fl nat smn 8tx firmware/4.63
- canonical/phoenixcontact fl nat smn 8tx
- canonical/phoenixcontact fl nat smn 8tx-m firmware
- version/phoenixcontact fl nat smn 8tx-m firmware/4.63
- canonical/phoenixcontact fl nat smn 8tx-m