CVE-2021-34581

Name: CVE-2021-34581
Creator: NVD / NIST
Published: 2021-08-31T11:15:07.83+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.02%

Last modified Jun 17, 2026

CVE-2021-34581 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Missing Release of Resource after Effective Lifetime vulnerability in OpenSSL implementation of WAGO 750-831/xxx-xxx, 750-880/xxx-xxx, 750-881, 750-889 in versions FW4 up to FW15 allows an unauthenticated attacker to cause DoS on the device.. EPSS estimates a 1.02% chance of exploitation in the next 30 days.

Description

Missing Release of Resource after Effective Lifetime vulnerability in OpenSSL implementation of WAGO 750-831/xxx-xxx, 750-880/xxx-xxx, 750-881, 750-889 in versions FW4 up to FW15 allows an unauthenticated attacker to cause DoS on the device.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.02%

59.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Wago	750-880\/040-000 Firmware	>= fw4, <= fw15
Wago	750-880\/025-002 Firmware	>= fw4, <= fw15
Wago	750-880\/025-001 Firmware	>= fw4, <= fw15
Wago	750-880\/025-000 Firmware	>= fw4, <= fw15
Wago	750-831\/000-002 Firmware	>= fw4, <= fw15
Wago	750-889 Firmware	>= fw4, <= fw15
Wago	750-881 Firmware	>= fw4, <= fw15
Wago	750-831 Firmware	>= fw4, <= fw15
Wago	750-880 Firmware	>= fw4, <= fw15

References

https://cert.vde.com/en-us/advisories/vde-2021-038Third Party Advisory
https://cert.vde.com/en-us/advisories/vde-2021-038Third Party Advisory

Timeline

Published: Aug 31, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-34581?

How severe is CVE-2021-34581?

CVE-2021-34581 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.02% probability of exploitation in the next 30 days.

How do I fix CVE-2021-34581?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-34581?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST