CVE-2021-21000

WAGO: PFC200 Denial of Service due to the number of connections to the runtime

HIGH
7.5
CVSS Score
Published: May 24, 2021 at 11:05 AM UTC
Updated: June 17, 2026 at 03:34 AM UTC
56 products affected across 1 vendor750-8202 Firmware750-862 Firmware750-823 Firmware

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Severity
HIGH7.5
Exploit prediction
EPSS 1%

Description

On WAGO PFC200 devices in different firmware versions with special crafted packets an attacker with network access to the device could cause a denial of service for the login service of the runtime.

Affected

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

v < 03.06.19_(18)
Affected range stops below 03.06.19_(18), so it looks safe — our inference, not a vendor statement
wago-750-8202 (same device)
v < 03.06.19_(18)
Affected range stops below 03.06.19_(18), so it looks safe — our inference, not a vendor statement
wago-750-8203 (same device)
v < 03.06.19_(18)
Affected range stops below 03.06.19_(18), so it looks safe — our inference, not a vendor statement
wago-750-8204 (same device)
v < 03.06.19_(18)
Affected range stops below 03.06.19_(18), so it looks safe — our inference, not a vendor statement
wago-750-8206 (same device)
v < 03.06.19_(18)
Affected range stops below 03.06.19_(18), so it looks safe — our inference, not a vendor statement
wago-750-8207 (same device)
v < 03.06.19_(18)
Affected range stops below 03.06.19_(18), so it looks safe — our inference, not a vendor statement
wago-750-8208 (same device)
v < 03.06.19_(18)
Affected range stops below 03.06.19_(18), so it looks safe — our inference, not a vendor statement
wago-750-8210 (same device)
v < 03.06.19_(18)
Affected range stops below 03.06.19_(18), so it looks safe — our inference, not a vendor statement
wago-750-8211 (same device)
v < 03.06.19_(18)
Affected range stops below 03.06.19_(18), so it looks safe — our inference, not a vendor statement
wago-750-8212 (same device)
v < 03.06.19_(18)
Affected range stops below 03.06.19_(18), so it looks safe — our inference, not a vendor statement
wago-750-8213 (same device)

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-2021-014

CVSS

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

Quick Info

StatusANALYZED
CWE
CWE-770

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