Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2021-21005

Severity CVSS v4.0:
Pending analysis
Type:
CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Publication date:
25/06/2021
Last modified:
01/07/2021

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.

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.50 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
7.50
Severity 3.x
HIGH
Vector 2.0
AV:N/AC:L/Au:N/C:N/I:N/A:C CVSS v2.0 Severity and Metrics:

Base Score: 7.80 HIGH
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C

Attack Vector (AV): Network
Attack Complexity (AC): Low
Authentication (Au): None
Confidentiality (C): None
Integrity (I): None
Availability (A): Complete

Base Score 2.0
7.80
Severity 2.0
HIGH

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:phoenixcontact:fl_switch_smcs_16tx_firmware:*:*:*:*:*:*:*:* 4.70 (including)
cpe:2.3:h:phoenixcontact:fl_switch_smcs_16tx:-:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_smcs_14tx\/2fx_firmware:*:*:*:*:*:*:*:* 4.70 (including)
cpe:2.3:h:phoenixcontact:fl_switch_smcs_14tx\/2fx:-:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_smcs_14tx\/2fx-sm_firmware:*:*:*:*:*:*:*:* 4.70 (including)
cpe:2.3:h:phoenixcontact:fl_switch_smcs_14tx\/2fx-sm:-:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_smcs_8gt_firmware:*:*:*:*:*:*:*:* 4.70 (including)
cpe:2.3:h:phoenixcontact:fl_switch_smcs_8gt:-:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_smcs_6gt\/2sfp_firmware:*:*:*:*:*:*:*:* 4.70 (including)
cpe:2.3:h:phoenixcontact:fl_switch_smcs_6gt\/2sfp:-:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_smcs_8tx-pn_firmware:*:*:*:*:*:*:*:* 4.70 (including)
cpe:2.3:h:phoenixcontact:fl_switch_smcs_8tx-pn:-:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_smcs_4tx-pn_firmware:*:*:*:*:*:*:*:* 4.70 (including)
cpe:2.3:h:phoenixcontact:fl_switch_smcs_4tx-pn:-:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_smcs_8tx_firmware:*:*:*:*:*:*:*:* 4.70 (including)

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools