CVE-2021-34569 | WAGO I/O-Check Service prone to Out-of-bounds Write

In WAGO I/O-Check Service in multiple products an attacker can send a specially crafted packet containing OS commands to crash the diagnostic tool and write memory.

Published: 2022-11-09 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-34569 is rated Moderate Risk (53.6/100): CVSS Critical severity, with low exploitation likelihood (EPSS 0.20%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-34569

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-02-15 0.28% 0.20% -0.08%
2 2025-11-21 0.20% 0.28% +0.08%
3 2025-11-18 — 0.20% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-34569

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]

Weakness enumeration for CVE-2021-34569

Affected software / configurations for CVE-2021-34569

Vendor Product Version Raw CPE
wago 750-8100_firmware < 18 cpe:2.3:o:wago:750-8100_firmware:*:*:*:*:*:*:*:*
wago 750-8100_firmware 18 cpe:2.3:o:wago:750-8100_firmware:18:-:*:*:*:*:*:*
wago 750-8100_firmware 18 cpe:2.3:o:wago:750-8100_firmware:18:patch_1:*:*:*:*:*:*
wago 750-8100_firmware 18 cpe:2.3:o:wago:750-8100_firmware:18:patch_2:*:*:*:*:*:*
wago 750-8101_firmware < 18 cpe:2.3:o:wago:750-8101_firmware:*:*:*:*:*:*:*:*
wago 750-8101_firmware 18 cpe:2.3:o:wago:750-8101_firmware:18:-:*:*:*:*:*:*
wago 750-8101_firmware 18 cpe:2.3:o:wago:750-8101_firmware:18:patch_1:*:*:*:*:*:*
wago 750-8101_firmware 18 cpe:2.3:o:wago:750-8101_firmware:18:patch_2:*:*:*:*:*:*
wago 750-8101\/025-000_firmware < 18 cpe:2.3:o:wago:750-8101\/025-000_firmware:*:*:*:*:*:*:*:*
wago 750-8101\/025-000_firmware 18 cpe:2.3:o:wago:750-8101\/025-000_firmware:18:-:*:*:*:*:*:*
wago 750-8101\/025-000_firmware 18 cpe:2.3:o:wago:750-8101\/025-000_firmware:18:patch_1:*:*:*:*:*:*
wago 750-8101\/025-000_firmware 18 cpe:2.3:o:wago:750-8101\/025-000_firmware:18:patch_2:*:*:*:*:*:*
wago 750-8102_firmware < 18 cpe:2.3:o:wago:750-8102_firmware:*:*:*:*:*:*:*:*
wago 750-8102_firmware 18 cpe:2.3:o:wago:750-8102_firmware:18:-:*:*:*:*:*:*
wago 750-8102_firmware 18 cpe:2.3:o:wago:750-8102_firmware:18:patch_1:*:*:*:*:*:*
wago 750-8102_firmware 18 cpe:2.3:o:wago:750-8102_firmware:18:patch_2:*:*:*:*:*:*
wago 750-8102\/025-000_firmware < 18 cpe:2.3:o:wago:750-8102\/025-000_firmware:*:*:*:*:*:*:*:*
wago 750-8102\/025-000_firmware 18 cpe:2.3:o:wago:750-8102\/025-000_firmware:18:-:*:*:*:*:*:*
wago 750-8102\/025-000_firmware 18 cpe:2.3:o:wago:750-8102\/025-000_firmware:18:patch_1:*:*:*:*:*:*
wago 750-8102\/025-000_firmware 18 cpe:2.3:o:wago:750-8102\/025-000_firmware:18:patch_2:*:*:*:*:*:*
wago 750-8202_firmware < 18 cpe:2.3:o:wago:750-8202_firmware:*:*:*:*:*:*:*:*
wago 750-8202_firmware 18 cpe:2.3:o:wago:750-8202_firmware:18:-:*:*:*:*:*:*
wago 750-8202_firmware 18 cpe:2.3:o:wago:750-8202_firmware:18:patch_1:*:*:*:*:*:*
wago 750-8202_firmware 18 cpe:2.3:o:wago:750-8202_firmware:18:patch_2:*:*:*:*:*:*
wago 750-8202\/000-011_firmware < 18 cpe:2.3:o:wago:750-8202\/000-011_firmware:*:*:*:*:*:*:*:*
wago 750-8202\/000-011_firmware 18 cpe:2.3:o:wago:750-8202\/000-011_firmware:18:-:*:*:*:*:*:*
wago 750-8202\/000-011_firmware 18 cpe:2.3:o:wago:750-8202\/000-011_firmware:18:patch_1:*:*:*:*:*:*
wago 750-8202\/000-011_firmware 18 cpe:2.3:o:wago:750-8202\/000-011_firmware:18:patch_2:*:*:*:*:*:*
wago 750-8202\/000-012_firmware < 18 cpe:2.3:o:wago:750-8202\/000-012_firmware:*:*:*:*:*:*:*:*
wago 750-8202\/000-012_firmware 18 cpe:2.3:o:wago:750-8202\/000-012_firmware:18:-:*:*:*:*:*:*
wago 750-8202\/000-012_firmware 18 cpe:2.3:o:wago:750-8202\/000-012_firmware:18:patch_1:*:*:*:*:*:*
wago 750-8202\/000-012_firmware 18 cpe:2.3:o:wago:750-8202\/000-012_firmware:18:patch_2:*:*:*:*:*:*
wago 750-8202\/000-022_firmware < 18 cpe:2.3:o:wago:750-8202\/000-022_firmware:*:*:*:*:*:*:*:*
wago 750-8202\/000-022_firmware 18 cpe:2.3:o:wago:750-8202\/000-022_firmware:18:-:*:*:*:*:*:*
wago 750-8202\/000-022_firmware 18 cpe:2.3:o:wago:750-8202\/000-022_firmware:18:patch_1:*:*:*:*:*:*
wago 750-8202\/000-022_firmware 18 cpe:2.3:o:wago:750-8202\/000-022_firmware:18:patch_2:*:*:*:*:*:*
wago 750-8202\/025-000_firmware < 18 cpe:2.3:o:wago:750-8202\/025-000_firmware:*:*:*:*:*:*:*:*
wago 750-8202\/025-000_firmware 18 cpe:2.3:o:wago:750-8202\/025-000_firmware:18:-:*:*:*:*:*:*
wago 750-8202\/025-000_firmware 18 cpe:2.3:o:wago:750-8202\/025-000_firmware:18:patch_1:*:*:*:*:*:*
wago 750-8202\/025-000_firmware 18 cpe:2.3:o:wago:750-8202\/025-000_firmware:18:patch_2:*:*:*:*:*:*
wago 750-8202\/025-001_firmware < 18 cpe:2.3:o:wago:750-8202\/025-001_firmware:*:*:*:*:*:*:*:*
wago 750-8202\/025-001_firmware 18 cpe:2.3:o:wago:750-8202\/025-001_firmware:18:-:*:*:*:*:*:*
wago 750-8202\/025-001_firmware 18 cpe:2.3:o:wago:750-8202\/025-001_firmware:18:patch_1:*:*:*:*:*:*
wago 750-8202\/025-001_firmware 18 cpe:2.3:o:wago:750-8202\/025-001_firmware:18:patch_2:*:*:*:*:*:*
wago 750-8202\/025-002_firmware < 18 cpe:2.3:o:wago:750-8202\/025-002_firmware:*:*:*:*:*:*:*:*
wago 750-8202\/025-002_firmware 18 cpe:2.3:o:wago:750-8202\/025-002_firmware:18:-:*:*:*:*:*:*
wago 750-8202\/025-002_firmware 18 cpe:2.3:o:wago:750-8202\/025-002_firmware:18:patch_1:*:*:*:*:*:*
wago 750-8202\/025-002_firmware 18 cpe:2.3:o:wago:750-8202\/025-002_firmware:18:patch_2:*:*:*:*:*:*
wago 750-8202\/040-000_firmware < 18 cpe:2.3:o:wago:750-8202\/040-000_firmware:*:*:*:*:*:*:*:*
wago 750-8202\/040-000_firmware 18 cpe:2.3:o:wago:750-8202\/040-000_firmware:18:-:*:*:*:*:*:*
wago 750-8202\/040-000_firmware 18 cpe:2.3:o:wago:750-8202\/040-000_firmware:18:patch_1:*:*:*:*:*:*
wago 750-8202\/040-000_firmware 18 cpe:2.3:o:wago:750-8202\/040-000_firmware:18:patch_2:*:*:*:*:*:*
wago 750-8202\/040-001_firmware < 18 cpe:2.3:o:wago:750-8202\/040-001_firmware:*:*:*:*:*:*:*:*
wago 750-8202\/040-001_firmware 18 cpe:2.3:o:wago:750-8202\/040-001_firmware:18:-:*:*:*:*:*:*
wago 750-8202\/040-001_firmware 18 cpe:2.3:o:wago:750-8202\/040-001_firmware:18:patch_1:*:*:*:*:*:*
wago 750-8202\/040-001_firmware 18 cpe:2.3:o:wago:750-8202\/040-001_firmware:18:patch_2:*:*:*:*:*:*
wago 752-8303\/8000-002_firmware < 18 cpe:2.3:o:wago:752-8303\/8000-002_firmware:*:*:*:*:*:*:*:*
wago 752-8303\/8000-002_firmware 18 cpe:2.3:o:wago:752-8303\/8000-002_firmware:18:-:*:*:*:*:*:*
wago 752-8303\/8000-002_firmware 18 cpe:2.3:o:wago:752-8303\/8000-002_firmware:18:patch_1:*:*:*:*:*:*
wago 752-8303\/8000-002_firmware 18 cpe:2.3:o:wago:752-8303\/8000-002_firmware:18:patch_2:*:*:*:*:*:*
wago 762-4101_firmware < 18 cpe:2.3:o:wago:762-4101_firmware:*:*:*:*:*:*:*:*
wago 762-4101_firmware 18 cpe:2.3:o:wago:762-4101_firmware:18:-:*:*:*:*:*:*
wago 762-4101_firmware 18 cpe:2.3:o:wago:762-4101_firmware:18:patch_1:*:*:*:*:*:*
wago 762-4101_firmware 18 cpe:2.3:o:wago:762-4101_firmware:18:patch_2:*:*:*:*:*:*
wago 762-4102_firmware < 18 cpe:2.3:o:wago:762-4102_firmware:*:*:*:*:*:*:*:*
wago 762-4102_firmware 18 cpe:2.3:o:wago:762-4102_firmware:18:-:*:*:*:*:*:*
wago 762-4102_firmware 18 cpe:2.3:o:wago:762-4102_firmware:18:patch_1:*:*:*:*:*:*
wago 762-4102_firmware 18 cpe:2.3:o:wago:762-4102_firmware:18:patch_2:*:*:*:*:*:*
wago 762-4103_firmware < 18 cpe:2.3:o:wago:762-4103_firmware:*:*:*:*:*:*:*:*
wago 762-4103_firmware 18 cpe:2.3:o:wago:762-4103_firmware:18:-:*:*:*:*:*:*
wago 762-4103_firmware 18 cpe:2.3:o:wago:762-4103_firmware:18:patch_1:*:*:*:*:*:*
wago 762-4103_firmware 18 cpe:2.3:o:wago:762-4103_firmware:18:patch_2:*:*:*:*:*:*
wago 762-4104_firmware < 18 cpe:2.3:o:wago:762-4104_firmware:*:*:*:*:*:*:*:*
wago 762-4104_firmware 18 cpe:2.3:o:wago:762-4104_firmware:18:-:*:*:*:*:*:*
wago 762-4104_firmware 18 cpe:2.3:o:wago:762-4104_firmware:18:patch_1:*:*:*:*:*:*
wago 762-4104_firmware 18 cpe:2.3:o:wago:762-4104_firmware:18:patch_2:*:*:*:*:*:*
wago 762-4201\/8000-001_firmware < 18 cpe:2.3:o:wago:762-4201\/8000-001_firmware:*:*:*:*:*:*:*:*
wago 762-4201\/8000-001_firmware 18 cpe:2.3:o:wago:762-4201\/8000-001_firmware:18:-:*:*:*:*:*:*
wago 762-4201\/8000-001_firmware 18 cpe:2.3:o:wago:762-4201\/8000-001_firmware:18:patch_1:*:*:*:*:*:*
wago 762-4201\/8000-001_firmware 18 cpe:2.3:o:wago:762-4201\/8000-001_firmware:18:patch_2:*:*:*:*:*:*

References for CVE-2021-34569

URL Tags
https://cert.vde.com/en/advisories/VDE-2020-036/ Third Party Advisory
cvelogic Threat Intelligence