CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2021-21005
High (7.5) in phoenixcontact. EPSS 0.7% chance of exploitation in the next 30 days.
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.
Severity
- EPSS
- 0.7% chance of exploitation in the next 30 days; higher than 52% of CVEs (scores of 2026-10-31)
- CWE
- CWE-362
- Published
- Modified
- Record from
- the NVD, synced
Affected
- phoenixcontact:fl_nat_smn_8tx-m_firmware
- phoenixcontact:fl_nat_smn_8tx_firmware
- phoenixcontact:fl_switch_smcs_14tx\/2fx-sm_firmware
- phoenixcontact:fl_switch_smcs_14tx\/2fx_firmware
- phoenixcontact:fl_switch_smcs_16tx_firmware
- phoenixcontact:fl_switch_smcs_4tx-pn_firmware
- phoenixcontact:fl_switch_smcs_6gt\/2sfp_firmware
- phoenixcontact:fl_switch_smcs_6tx\/2sfp_firmware
- phoenixcontact:fl_switch_smcs_8gt_firmware
- phoenixcontact:fl_switch_smcs_8tx-pn_firmware
- phoenixcontact:fl_switch_smcs_8tx_firmware
- phoenixcontact:fl_switch_smn_6tx\/2fx_firmware
- phoenixcontact:fl_switch_smn_6tx\/2fx_sm_firmware
- phoenixcontact:fl_switch_smn_6tx\/2pof-pn_firmware
- phoenixcontact:fl_switch_smn_8tx-pn_firmware