Vulnerability in Phoenix Contact Fl Nat
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.
Vulnerability class: Race Condition
EPSS: 0.007 (48.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Phoenix Contact Fl Nat — versions SMN 8TX (2989365), SMN 8TX-M (2702443)
- Phoenix Contact Fl Switch — versions SMCS 16TX (2700996), SMCS 14TX/2FX (2700997), SMCS 14TX/2FX-SM (2701466)
- Phoenixcontact Fl_nat_smn_8tx
- Phoenixcontact Fl_nat_smn_8tx_firmware
- Phoenixcontact Fl_nat_smn_8tx-m
- Phoenixcontact Fl_nat_smn_8tx-m_firmware
- Phoenixcontact Fl_switch_smcs_14tx\/2fx
- Phoenixcontact Fl_switch_smcs_14tx\/2fx_firmware
- Phoenixcontact Fl_switch_smcs_14tx\/2fx-sm
- Phoenixcontact Fl_switch_smcs_14tx\/2fx-sm_firmware
Weakness classification (CWE)
References
- info@cert.vde.com (x_refsource_CONFIRM, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-21005?
- CVE-2021-21005 is a high-severity vulnerability in Phoenix Contact Fl Nat, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 7.5/10. Published 2021-06-25.
- How severe is CVE-2021-21005?
- High severity. CVSS v3 base score is 7.5 out of 10.