High severity7.5NVD Advisory· Published Sep 27, 2021· Updated Jun 17, 2026

CVE-2021-34570

Description

Multiple Phoenix Contact PLCnext control devices in versions prior to 2021.0.5 LTS are prone to a DoS attack through special crafted JSON requests.

LLM-synthesized narrative grounded in this CVE's description and references.

Phoenixcontact/Axc F 1152 Firmware
cpe:2.3:o:phoenixcontact:axc_f_1152_firmware:*:*:*:*:lts:*:*:*
Range: <2021.0.5
Phoenixcontact/Axc F 2152 Firmware
cpe:2.3:o:phoenixcontact:axc_f_2152_firmware:*:*:*:*:lts:*:*:*
Range: <2021.0.5
Phoenixcontact/Axc F 2152 Starterkit Firmware
cpe:2.3:o:phoenixcontact:axc_f_2152_starterkit_firmware:*:*:*:*:lts:*:*:*
Range: <2021.0.5
Phoenixcontact/Axc F 3152 Firmware
cpe:2.3:o:phoenixcontact:axc_f_3152_firmware:*:*:*:*:lts:*:*:*
Range: <2021.0.5
Phoenixcontact/Plcnext Technology Starterkit Firmware
cpe:2.3:o:phoenixcontact:plcnext_technology_starterkit_firmware:*:*:*:*:lts:*:*:*
Range: <2021.0.5
Phoenixcontact/Rfc 4072s Firmware
cpe:2.3:o:phoenixcontact:rfc_4072s_firmware:*:*:*:*:lts:*:*:*
Range: <2021.0.5
Phoenixcontact/PLCnext Control Devicesllm-fuzzy
Range: <2021.0.5 LTS
Phoenix Contact/AXC Fv5
Range: AXC F 1152 (1151412)
Phoenixcontact/PLCnextcpe-rescue
Range: PLCnext Technology Starterkit (1188165)
Phoenix Contact/RFCv5
Range: RFC 4072S (1051328)