Vulnerability Details : CVE-2021-21005
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.
Products affected by CVE-2021-21005
- cpe:2.3:o:phoenixcontact:fl_nat_smn_8tx-m_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:phoenixcontact:fl_nat_smn_8tx_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:phoenixcontact:fl_switch_smcs_16tx_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:phoenixcontact:fl_switch_smcs_14tx\/2fx_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:phoenixcontact:fl_switch_smcs_14tx\/2fx-sm_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:phoenixcontact:fl_switch_smcs_8gt_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:phoenixcontact:fl_switch_smcs_6gt\/2sfp_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:phoenixcontact:fl_switch_smcs_8tx-pn_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:phoenixcontact:fl_switch_smcs_4tx-pn_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:phoenixcontact:fl_switch_smcs_8tx_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:phoenixcontact:fl_switch_smcs_6tx\/2sfp_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:phoenixcontact:fl_switch_smn_6tx\/2pof-pn_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:phoenixcontact:fl_switch_smn_8tx-pn_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:phoenixcontact:fl_switch_smn_6tx\/2fx_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:phoenixcontact:fl_switch_smn_6tx\/2fx_sm_firmware:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-21005
0.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 10 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-21005
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
7.8
|
HIGH | AV:N/AC:L/Au:N/C:N/I:N/A:C |
10.0
|
6.9
|
NIST | |
|
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
3.9
|
3.6
|
CERT VDE | |
|
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
3.9
|
3.6
|
NIST |
CWE ids for CVE-2021-21005
-
The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.Assigned by: info@cert.vde.com (Primary)
References for CVE-2021-21005
-
https://cert.vde.com/en-us/advisories/vde-2021-023
PHOENIX CONTACT : Security Advisory for FL SWITCH SMCS series — English (USA)Third Party Advisory
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