What is the CVSS score of CVE-2021-21005?

CVE-2021-21005 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.7%.

Fl Switch Smcs 16Tx Firmware CVE-2021-21005

HIGH

Race Condition (CWE-362)

2021-06-25 info@cert.vde.com

Denial Of Service Race Condition Fl Switch Smcs 16Tx Firmware Fl Switch Smcs 14Tx 2Fx Firmware Fl Switch Smcs 14Tx 2Fx Sm Firmware Fl Switch Smcs 8Gt Firmware Fl Switch Smcs 6Gt 2Sfp Firmware Fl Switch Smcs 8Tx Pn Firmware Fl Switch Smcs 4Tx Pn Firmware Fl Switch Smcs 8Tx Firmware Fl Switch Smcs 6Tx 2Sfp Firmware Fl Switch Smn 6Tx 2Pof Pn Firmware Fl Switch Smn 8Tx Pn Firmware Fl Switch Smn 6Tx 2Fx Firmware Fl Switch Smn 6Tx 2Fx Sm Firmware Fl Nat Smn 8Tx Firmware Fl Nat Smn 8Tx M Firmware

7.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

CVE Published

Jun 25, 2021 - 19:15 nvd

HIGH 7.5

DescriptionNVD

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.

AnalysisAI

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. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Technical ContextAI

This vulnerability is classified under CWE-362. 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 products include: Phoenixcontact Fl Switch Smcs 16Tx Firmware, Phoenixcontact Fl Switch Smcs 14Tx\/2Fx Firmware, Phoenixcontact Fl Switch Smcs 14Tx\/2Fx-Sm Firmware, Phoenixcontact Fl Switch Smcs 8Gt Firmware, Phoenixcontact Fl Switch Smcs 6Gt\/2Sfp Firmware.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.