CVE-2021-21005

Race Condition Vulnerability in Phoenix Contact FL SWITCH SMCS series products

Published Jun 25, 2021 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Workaround

Phoenix Contact recommends operating network-capable devices in closed networks or protected with a suitable firewall. For detailed information on our recommendations for measures to protect network-capable devices, please refer to the Phoenix Contact application note: Measures to protect network-capable devices with Ethernet connection https://dam-mdc.phoenixcontact.com/asset/156443151564/0a870ae433c19148b80bd760f3a1c1f2/107913_en_03.pdf

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2021-8414 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.
History

No history.

Weaknesses

Sources

Status
PUBLISHED
Assigner
CERTVDE
Published
Updated
Sep 17, 2024, 2:17 AM
Reserved
Dec 17, 2020, 12:00 AM
Status
Modified
Published
Jun 25, 2021, 7:15 PM
Modified
Jun 17, 2026, 3:34 AM