How severe is CVE-2021-34568?

CVE-2021-34568 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-34568 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-34568?

CVE-2021-34568 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-2021-34568?

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

When was CVE-2021-34568 published?

CVE-2021-34568 was published on 2022-11-09 and last updated on 2026-06-17.

CVE-2021-34568

CVE-2021-34568 is a high-severity vulnerability in Wago 750-8100 Firmware with a CVSS 3.x base score of 7.5. 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-770.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (59th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-770
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 unauthenticated remote attacker can send a specially crafted packet containing OS commands to provoke a denial of service.

Frequently asked questions

What is CVE-2021-34568?: In WAGO I/O-Check Service in multiple products an unauthenticated remote attacker can send a specially crafted packet containing OS commands to provoke a denial of service.
How severe is CVE-2021-34568?: CVE-2021-34568 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-34568 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-34568?: CVE-2021-34568 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-2021-34568?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-34568 published?: CVE-2021-34568 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-2021-34569 — Critical (CVSS 9.8): In WAGO I/O-Check Service in multiple products an attacker can send a specially crafted packet containing OS commands…
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-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…

All CVEs affecting Wago 750-8100 Firmware →

Other CWE-770 (Allocation of Resources Without Limits or Throttling) vulnerabilities

CVE-2026-31283 — Critical (CVSS 9.8): In Totara LMS v19.1.5 and before, the forgot password API does not implement rate limiting for the target email…
CVE-2020-37067 — Critical (CVSS 9.8): Filetto 1.0 FTP server contains a denial of service vulnerability in the FEAT command processing that allows attackers…
CVE-2021-47875 — Critical (CVSS 9.8): GeoGebra CAS Calculator 6.0.631.0 contains a denial of service vulnerability that allows attackers to crash the…
CVE-2025-11832 — Critical (CVSS 9.8): Allocation of Resources Without Limits or Throttling vulnerability in Azure Access Technology BLU-IC2, Azure Access…
CVE-2024-44241 — Critical (CVSS 9.8): The issue was addressed with improved bounds checks. This issue is fixed in iOS 18.1 and iPadOS 18.1, macOS Sequoia…
CVE-2022-3439 — Critical (CVSS 9.8): Allocation of Resources Without Limits or Throttling in GitHub repository ikus060/rdiffweb prior to 2.5.0.

Browse all CWE-770 (Allocation of Resources Without Limits or Throttling) vulnerabilities →