medium
5.3
CWE
404
Advisory Published
Updated

CVE-2021-21003: Denial of Service 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 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.

Credit: info@cert.vde.com

Affected SoftwareAffected VersionHow to fix
Phoenixcontact FL Switch SMCS 16TX Firmware<=4.70
Phoenix Contact 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
Phoenix Contact FL Switch SMCS 14TX/2FX-SM
Phoenixcontact Fl Switch Smcs 8gt Firmware<=4.70
Phoenixcontact Fl Switch Smcs 8gt Firmware
Phoenixcontact Fl Switch Smcs 6gt/2sfp Firmware<=4.70
Phoenixcontact Fl Switch Smcs 6gt/2sfp
Phoenixcontact Fl Switch Smn 8tx-pn Firmware<=4.70
Phoenixcontact Fl Switch Smcs 8tx-pn Firmware
Phoenix Contact FL Switch SMCS 4TX-PN Firmware<=4.70
Phoenix Contact FL Switch SMCS 4TX-PN Firmware
Phoenixcontact Fl Switch Smcs 8tx Firmware<=4.70
Phoenix Contact FL Switch SMCS 8TX
Phoenixcontact Fl Switch Smcs 6tx/2sfp Firmware<=4.70
Phoenixcontact Fl Switch Smcs 6tx/2sfp
Phoenix Contact FL Switch SMN 6TX/2POF-PN Firmware<=4.70
Phoenix Contact FL Switch SMN 6TX/2POF-PN
Phoenixcontact Fl Switch Smn 8tx-pn Firmware<=4.70
Phoenixcontact Fl Switch Smn 8tx-pn Firmware
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
Phoenix Contact FL Switch SMN 6TX/2FX SM
Phoenix Contact FL NAT SMN 8TX Firmware<=4.63
Phoenix Contact FL NAT SMN 8TX-M
Phoenix Contact FL NAT SMN 8TX-M Firmware<=4.63
Phoenix Contact FL NAT SMN 8TX-M Firmware

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Read MoreStart Free Trial

Reference Links

Frequently Asked Questions

  • What is the vulnerability ID for this Phoenix Contact FL SWITCH SMCS series products vulnerability?

    The vulnerability ID for this Phoenix Contact FL SWITCH SMCS series products vulnerability is CVE-2021-21003.

  • What is the severity of CVE-2021-21003?

    The severity of CVE-2021-21003 is medium with a severity value of 5.3.

  • What is the impact of CVE-2021-21003?

    CVE-2021-21003 can cause a Denial of Service of Web-, SNMP- and ICMP-Echo services on Phoenix Contact FL SWITCH SMCS series products.

  • How can I fix CVE-2021-21003?

    To fix CVE-2021-21003, it is recommended to update the firmware of Phoenix Contact FL SWITCH SMCS series products to version 4.70 or later.

  • Where can I find more information about CVE-2021-21003?

    More information about CVE-2021-21003 can be found at the following reference: [link](https://cert.vde.com/en-us/advisories/vde-2021-023).

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2025 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203