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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.007 (50.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
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
- cert.vde.com/en-us/advisories/vde-2021-023 (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.