CVEvulnerability

CVE-2021-21005

7.5 HIGH Published 2021-06-25 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2021-06-25
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 3.1 ([email protected])
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0 ([email protected])
7.8 HIGH — AV:N/AC:L/Au:N/C:N/I:N/A:C
Weaknesses
CWE-362

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.

Affected configurations

• phoenixcontact fl switch smcs 16tx firmware (<= 4.70) • phoenixcontact fl switch smcs 14tx\/2fx firmware (<= 4.70) • phoenixcontact fl switch smcs 14tx\/2fx-sm firmware (<= 4.70) • phoenixcontact fl switch smcs 8gt firmware (<= 4.70) • phoenixcontact fl switch smcs 6gt\/2sfp firmware (<= 4.70) • phoenixcontact fl switch smcs 8tx-pn firmware (<= 4.70) • phoenixcontact fl switch smcs 4tx-pn firmware (<= 4.70) • phoenixcontact fl switch smcs 8tx firmware (<= 4.70) • phoenixcontact fl switch smcs 6tx\/2sfp firmware (<= 4.70) • phoenixcontact fl switch smn 6tx\/2pof-pn firmware (<= 4.70) • phoenixcontact fl switch smn 8tx-pn firmware (<= 4.70) • phoenixcontact fl switch smn 6tx\/2fx firmware (<= 4.70) • phoenixcontact fl switch smn 6tx\/2fx sm firmware (<= 4.70) • phoenixcontact fl nat smn 8tx firmware (<= 4.63) • phoenixcontact fl nat smn 8tx-m firmware (<= 4.63)

Related

Weakness · CWE (1)

  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization weakness

References