How severe is CVE-2021-34569?

CVE-2021-34569 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-34569 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-34569?

CVE-2021-34569 primarily affects Wago 750-8100 Firmware. In total, 196 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-34569?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-34569 published?

CVE-2021-34569 was published on 2022-11-09 and last updated on 2026-06-17.

CVE-2021-34569

CVE-2021-34569 is a critical-severity vulnerability in Wago 750-8100 Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (52nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Wago 750-8100 Firmware
Published: 2022-11-09
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2021-34569?: 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.
How severe is CVE-2021-34569?: CVE-2021-34569 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-34569 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-34569?: CVE-2021-34569 primarily affects Wago 750-8100 Firmware. In total, 196 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-34569?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-34569 published?: CVE-2021-34569 was published on 2022-11-09 and last updated on 2026-06-17.

References

https://cert.vde.com/en/advisories/VDE-2020-036/

Affected products (196)

cpe:2.3:o:wago:750-8100_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:wago:750-8100_firmware:18:-:*:*:*:*:*:*
cpe:2.3:o:wago:750-8100_firmware:18:patch_1:*:*:*:*:*:*
cpe:2.3:o:wago:750-8100_firmware:18:patch_2:*:*:*:*:*:*
cpe:2.3:o:wago:750-8101_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:wago:750-8101_firmware:18:-:*:*:*:*:*:*
cpe:2.3:o:wago:750-8101_firmware:18:patch_1:*:*:*:*:*:*
cpe:2.3:o:wago:750-8101_firmware:18:patch_2:*:*:*:*:*:*
cpe:2.3:o:wago:750-8101\/025-000_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:wago:750-8101\/025-000_firmware:18:-:*:*:*:*:*:*
cpe:2.3:o:wago:750-8101\/025-000_firmware:18:patch_1:*:*:*:*:*:*
cpe:2.3:o:wago:750-8101\/025-000_firmware:18:patch_2:*:*:*:*:*:*
cpe:2.3:o:wago:750-8102_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:wago:750-8102_firmware:18:-:*:*:*:*:*:*
cpe:2.3:o:wago:750-8102_firmware:18:patch_1:*:*:*:*:*:*
cpe:2.3:o:wago:750-8102_firmware:18:patch_2:*:*:*:*:*:*
cpe:2.3:o:wago:750-8102\/025-000_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:wago:750-8102\/025-000_firmware:18:-:*:*:*:*:*:*
cpe:2.3:o:wago:750-8102\/025-000_firmware:18:patch_1:*:*:*:*:*:*
cpe:2.3:o:wago:750-8102\/025-000_firmware:18:patch_2:*:*:*:*:*:*
cpe:2.3:o:wago:750-8202_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:wago:750-8202_firmware:18:-:*:*:*:*:*:*
cpe:2.3:o:wago:750-8202_firmware:18:patch_1:*:*:*:*:*:*
cpe:2.3:o:wago:750-8202_firmware:18:patch_2:*:*:*:*:*:*
cpe:2.3:o:wago:750-8202\/000-011_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:wago:750-8202\/000-011_firmware:18:-:*:*:*:*:*:*
cpe:2.3:o:wago:750-8202\/000-011_firmware:18:patch_1:*:*:*:*:*:*
cpe:2.3:o:wago:750-8202\/000-011_firmware:18:patch_2:*:*:*:*:*:*
cpe:2.3:o:wago:750-8202\/000-012_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:wago:750-8202\/000-012_firmware:18:-:*:*:*:*:*:*
cpe:2.3:o:wago:750-8202\/000-012_firmware:18:patch_1:*:*:*:*:*:*
cpe:2.3:o:wago:750-8202\/000-012_firmware:18:patch_2:*:*:*:*:*:*
cpe:2.3:o:wago:750-8202\/000-022_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:wago:750-8202\/000-022_firmware:18:-:*:*:*:*:*:*
cpe:2.3:o:wago:750-8202\/000-022_firmware:18:patch_1:*:*:*:*:*:*
cpe:2.3:o:wago:750-8202\/000-022_firmware:18:patch_2:*:*:*:*:*:*
cpe:2.3:o:wago:750-8202\/025-000_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:wago:750-8202\/025-000_firmware:18:-:*:*:*:*:*:*
cpe:2.3:o:wago:750-8202\/025-000_firmware:18:patch_1:*:*:*:*:*:*
cpe:2.3:o:wago:750-8202\/025-000_firmware:18:patch_2:*:*:*:*:*:*

More vulnerabilities in Wago 750-8100 Firmware

CVE-2021-34566 — Critical (CVSS 9.1): In WAGO I/O-Check Service in multiple products an unauthenticated remote attacker can send a specially crafted packet…
CVE-2021-34567 — High (CVSS 8.2): In WAGO I/O-Check Service in multiple products an unauthenticated remote attacker can send a specially crafted packet…
CVE-2020-12069 — High (CVSS 7.8): In CODESYS V3 products in all versions prior V3.5.16.0 containing the CmpUserMgr, the CODESYS Control runtime system…
CVE-2021-34568 — High (CVSS 7.5): In WAGO I/O-Check Service in multiple products an unauthenticated remote attacker can send a specially crafted packet…
CVE-2022-3281 — High (CVSS 7.5): WAGO Series PFC100/PFC200, Series Touch Panel 600, Compact Controller CC100 and Edge Controller in multiple versions…
CVE-2022-22511 — Medium (CVSS 5.4): Various configuration pages of the device are vulnerable to reflected XSS (Cross-Site Scripting) attacks. An authorized…

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