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TI-2021-13588 Aliases CVE-2021-34570GHSA-5jgp-38vj-293v

Phoenix Contact: DoS for PLCnext Control devices in versions prior to 2021.0.5 LTS

Priority LOW 35CWE-20Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

EPSS 0.00978 62nd percentileScored 2026-11-07
Fix Fixed AXC F (Phoenix Contact): 2021.0.5 LTSRFC (Phoenix Contact): 2021.0.5 LTS+1 more product

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
Phoenix ContactAXC FAXC F 1152 (1151412) to before 2021.0.5 LTS; AXC F 2152 (2404267) to before 2021.0.5 LTS; AXC F 3152 (1069208) to before 2021.0.5 LTS; AXC F 2152 Starterkit (1046568) to before 2021.0.5 LTS2021.0.5 LTSPatch availableCNA
Phoenix ContactRFCRFC 4072S (1051328) to before 2021.0.5 LTS2021.0.5 LTSPatch availableCNA
Phoenix ContactPLCnextPLCnext Technology Starterkit (1188165) to before 2021.0.5 LTS2021.0.5 LTSPatch availableCNA
  • AXC F VendorPhoenix Contact Affected AXC F 1152 (1151412) to before 2021.0.5 LTS; AXC F 2152 (2404267) to before 2021.0.5 LTS; AXC F 3152 (1069208) to before 2021.0.5 LTS; AXC F 2152 Starterkit (1046568) to before 2021.0.5 LTS Fixed in 2021.0.5 LTS Patch available CNA
  • RFC VendorPhoenix Contact Affected RFC 4072S (1051328) to before 2021.0.5 LTS Fixed in 2021.0.5 LTS Patch available CNA
  • PLCnext VendorPhoenix Contact Affected PLCnext Technology Starterkit (1188165) to before 2021.0.5 LTS Fixed in 2021.0.5 LTS Patch available CNA

CPE configurations NVD · 12

CPEVersionsRoleVendor
cpe:2.3:o:phoenixcontact:plcnext_technology_starterkit_firmware:*:*:*:*:lts:*:*:*before 2021.0.5VulnerablePhoenixcontact
cpe:2.3:h:phoenixcontact:plcnext_technology_starterkit:-:*:*:*:*:*:*:*not specified by NVDRunning onPhoenixcontact
cpe:2.3:o:phoenixcontact:axc_f_2152_starterkit_firmware:*:*:*:*:lts:*:*:*before 2021.0.5VulnerablePhoenixcontact
cpe:2.3:h:phoenixcontact:axc_f_2152_starterkit:-:*:*:*:*:*:*:*not specified by NVDRunning onPhoenixcontact
cpe:2.3:o:phoenixcontact:rfc_4072s_firmware:*:*:*:*:lts:*:*:*before 2021.0.5VulnerablePhoenixcontact
cpe:2.3:h:phoenixcontact:rfc_4072s:-:*:*:*:*:*:*:*not specified by NVDRunning onPhoenixcontact
cpe:2.3:o:phoenixcontact:axc_f_3152_firmware:*:*:*:*:lts:*:*:*before 2021.0.5VulnerablePhoenixcontact
cpe:2.3:h:phoenixcontact:axc_f_3152:-:*:*:*:*:*:*:*not specified by NVDRunning onPhoenixcontact
cpe:2.3:o:phoenixcontact:axc_f_1152_firmware:*:*:*:*:lts:*:*:*before 2021.0.5VulnerablePhoenixcontact
cpe:2.3:h:phoenixcontact:axc_f_1152:-:*:*:*:*:*:*:*not specified by NVDRunning onPhoenixcontact
  • cpe:2.3:o:phoenixcontact:plcnext_technology_starterkit_firmware:*:*:*:*:lts:*:*:* Versions before 2021.0.5 Vulnerable ·Phoenixcontact
  • cpe:2.3:h:phoenixcontact:plcnext_technology_starterkit:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Phoenixcontact
  • cpe:2.3:o:phoenixcontact:axc_f_2152_starterkit_firmware:*:*:*:*:lts:*:*:* Versions before 2021.0.5 Vulnerable ·Phoenixcontact
  • cpe:2.3:h:phoenixcontact:axc_f_2152_starterkit:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Phoenixcontact
  • cpe:2.3:o:phoenixcontact:rfc_4072s_firmware:*:*:*:*:lts:*:*:* Versions before 2021.0.5 Vulnerable ·Phoenixcontact
  • cpe:2.3:h:phoenixcontact:rfc_4072s:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Phoenixcontact
  • cpe:2.3:o:phoenixcontact:axc_f_3152_firmware:*:*:*:*:lts:*:*:* Versions before 2021.0.5 Vulnerable ·Phoenixcontact
  • cpe:2.3:h:phoenixcontact:axc_f_3152:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Phoenixcontact
  • cpe:2.3:o:phoenixcontact:axc_f_1152_firmware:*:*:*:*:lts:*:*:* Versions before 2021.0.5 Vulnerable ·Phoenixcontact
  • cpe:2.3:h:phoenixcontact:axc_f_1152:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Phoenixcontact
Show 2 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:phoenixcontact:axc_f_2152_firmware:*:*:*:*:lts:*:*:*before 2021.0.5VulnerablePhoenixcontact
cpe:2.3:h:phoenixcontact:axc_f_2152:-:*:*:*:*:*:*:*not specified by NVDRunning onPhoenixcontact
  • cpe:2.3:o:phoenixcontact:axc_f_2152_firmware:*:*:*:*:lts:*:*:* Versions before 2021.0.5 Vulnerable ·Phoenixcontact
  • cpe:2.3:h:phoenixcontact:axc_f_2152:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Phoenixcontact

Remediation

  • Fix · CNA AXC F (Phoenix Contact) Fixed in 2021.0.5 LTS
  • Fix · CNA RFC (Phoenix Contact) Fixed in 2021.0.5 LTS
  • Fix · CNA PLCnext (Phoenix Contact) Fixed in 2021.0.5 LTS

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-34570
  2. 2026-10-03 Alias added: GHSA-5jgp-38vj-293v

References

Patch 1

  • TI-2014-07463 Phoenix Contact Software ProConOs and MultiProg Missing Authentication for Critical Function CVSS 2.0CRITICAL 10.0
  • TI-2024-17093 PHOENIX CONTACT: Remote code execution in CHARX Series CVSS 3.1CRITICAL 9.8
  • TI-2022-13692 Insufficient Verification of Data Vulnerability in PHOENIX CONTACT classic line industrial controllers CVSS 3.1CRITICAL 9.8
  • TI-2026-21959 Remote code execution via uploading a malicious IODD file CVSS 3.1CRITICAL 9.8
  • TI-2026-21940 Authentication Bypass in _account_log CVSS 3.1CRITICAL 9.8
  • TI-2023-03334 PHOENIX CONTACT: OS Command Injection in WP 6xxx Web panels CVSS 3.1CRITICAL 10.0
See all 194 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences