PT-2021-14332 · Phoenix Contact · Phoenix Contact Fl Switch Smcs

Anne Borcherding · Published 2021-06-25 · Updated 2021-07-02 · CVE-2021-21005

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions: Phoenix Contact FL SWITCH SMCS series products (affected versions not specified)

Description: The issue concerns a network stack crash that occurs when a hand-crafted TCP-Packet with the Urgent-Flag set and the Urgent-Pointer set to 0 is sent to the device. This results in the device needing to be rebooted afterwards.

Recommendations: At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Race Condition

Weakness Enumeration

CWE-362

Related Identifiers

CVE-2021-21005

Affected Products

Phoenix Contact Fl Switch Smcs

References · 4

• https://osv.dev/vulnerability/CVE-2021-21005 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-21005 · Security Note
• https://cert.vde.com/en-us/advisories/vde-2021-023 · Note
• https://t.me/cvenotify/16965 · Telegram Post