CVE-2021-34581

WAGO: Denial of Service vulnerability inside the OpenSSL implementation

HIGH
7.5
CVSS Score
Published: August 31, 2021 at 10:33 AM UTC
Updated: June 17, 2026 at 03:56 AM UTC
18 products affected across 1 vendor750-881 Firmware750-880 Firmware750-889 Firmware

Using 750-831/xxx-xxx, 750-880/xxx-xxx, 750-881, 750-889 by WAGO?

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Severity
HIGH7.5
Exploit prediction
EPSS 1%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

fw4 ≤ v ≤ fw15
wago-750-831-000-002 (same device)
fw4 ≤ v ≤ fw15
fw4 ≤ v ≤ fw15
wago-750-880-025-000 (same device)
fw4 ≤ v ≤ fw15
wago-750-880-025-001 (same device)
fw4 ≤ v ≤ fw15
wago-750-880-025-002 (same device)
fw4 ≤ v ≤ fw15
wago-750-880-040-000 (same device)
fw4 ≤ v ≤ fw15
fw4 ≤ v ≤ fw15
fw4 ≤ v ≤ fw15
FW4 ≤ v < All*fw4 ≤ v ≤ fw15FW4
Affected range stops below All*, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

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

CVSS

7.5HIGHCERTVDE
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-772

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