WAGO: PLC families 750-88x and 750-352 prone to DoS attack

published 2020-12-10 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-4818

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.9%; EPSS 1.9% chance of exploitation in 30 days, percentile 79%
public exploits: 0; none known

Older firmware versions (FW1 up to FW10) of the WAGO PLC family 750-88x and 750-352 are vulnerable for a special denial of service attack.

Patch / fix

links 1

cert.vde.com/en-us/advisories/vde-2020-042 advisory

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-20-308-01 updated 2020-12-15 cvss 7.5

WAGO Series 750-88x and 750-352 (Update A)

WAGO 750-331/xxx-xxx < FW11 WAGO 750-352 < FW11 WAGO 750-829 < FW11 WAGO 750-831/xxx-xxx < FW11 WAGO 750-852 < FW11 WAGO 750-880/xxx-xxx < FW11

+4 more productsfewer

WAGO 750-881 < FW11 WAGO 750-882 < FW11 WAGO 750-885 < FW11 WAGO 750-889 < FW11

affected: mitigation “WAGO recommends updating to the latest firmware, Version FW14” wago.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

1.89% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

WAGO 750-331/xxx-xxx
WAGO 750-352
WAGO 750-829
WAGO 750-831/xxx-xxx
WAGO 750-852
WAGO 750-880/xxx-xxx
WAGO 750-881
WAGO 750-882
WAGO 750-885
WAGO 750-889

Classification

Weakness

CWE-400 Uncontrolled Resource Consumption

References

cert.vde.com /en-us/advisories/vde-2020-042
patch, third-party-advisory
us-cert.cisa.gov /ics/advisories/icsa-20-308-01
mitigation, third-party-advisory, us-government-resource

Sources

CVE List CVE-2020-12516
NVD CVE-2020-12516

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary