Home/CVE/In WAGO I/O-Check Service in multiple products an unauthenticated remote attacker can send a specially crafted packet c
CVE

CVE-2021-34566

In WAGO I/O-Check Service in multiple products an unauthenticated remote attacker can send a specially crafted packet c

In WAGO I/O-Check Service in multiple products an unauthenticated remote attacker can send a specially crafted packet containing OS commands to crash the iocheck process and write memory resulting in loss of integrity and DoS.

CRITICAL · CVSS 9.1 EPSS 0.00901
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
▤

Affected Products & Versions

30
wago 750-8100 firmware< 18
wago 750-8100 firmwareall versions
wago 750-8101 firmware< 18
wago 750-8101 firmwareall versions
wago 750-8101\/025-000 firmware< 18
wago 750-8101\/025-000 firmwareall versions
wago 750-8102 firmware< 18
wago 750-8102 firmwareall versions
▣

Scoring & Timeline

9.1
CRITICAL · CVSS v3.1 · info@cert.vde.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD09 Nov 2022 · 04:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://cert.vde.com/en/advisories/VDE-2020-036/Vendor Advisory
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