High severity7.5NVD Advisory· Published Jun 25, 2021· Updated Jun 17, 2026

CVE-2021-21005

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Phoenixcontact/FL SWITCH SMCS seriesllm-fuzzy
Phoenixcontact/FL NAT 2208cpe-rescue
Range: SMN 8TX (2989365)
Phoenixcontact/FL SWITCHcpe-rescue
Range: SMCS 16TX (2700996)

Patches

Vulnerability mechanics

References

cert.vde.com/en-us/advisories/vde-2021-023nvdThird Party Advisory

News mentions

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