CVE-2020-12516

mediumpriority · track · 31EPSS 0.019 · 79 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.89% (79th) EPSS

CVSS 5 · medium

Is it mine?

60 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · cisa_csaf_ot · wago_psirt

EPSS · scored 2026-10-27

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.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

Fixedwago_psirt
Update the device to the latest FW version available here: https://www.wago.com/us/requestDownload?downloadFile=FWMedia_58_750-881
Mitigationwago_psirt
* Restrict network access to the device. * Do not directly connect the device to the internet * Disable unused TCP/UDP-ports
Mitigation750-331/xxx-xxxcisa_csaf_ot
Disable unused TCP/UDP ports.
Mitigation750-352cisa_csaf_ot
Disable unused TCP/UDP ports.
Mitigation750-829cisa_csaf_ot
Disable unused TCP/UDP ports.
Mitigation750-831/xxx-xxxcisa_csaf_ot
Disable unused TCP/UDP ports.
Mitigation750-852cisa_csaf_ot
Disable unused TCP/UDP ports.
Mitigation750-880/xxx-xxxcisa_csaf_ot
Disable unused TCP/UDP ports.
Mitigation750-881cisa_csaf_ot
Disable unused TCP/UDP ports.
Mitigation750-882cisa_csaf_ot
Disable unused TCP/UDP ports.
Mitigation750-885cisa_csaf_ot
Disable unused TCP/UDP ports.
Mitigation750-889cisa_csaf_ot
Disable unused TCP/UDP ports.

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · CISA US

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · ENISA EU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · info@cert.vde.comexploitability 3.9 · impact 3.6

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · WAGO PSIRT DE

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-400USCWE-400USCWE-400US

affected products (60)

Products and version ranges known to be affected.

750-331/xxx-xxx: versions prior to FW11all versionscisa_csaf_otUS
750-352: versions prior to FW11all versionscisa_csaf_otUS
750-829: versions prior to FW11all versionscisa_csaf_otUS
750-831/xxx-xxx: versions prior to FW11all versionscisa_csaf_otUS
750-852: versions prior to FW11all versionscisa_csaf_otUS
750-880/xxx-xxx: versions prior to FW11all versionscisa_csaf_otUS
750-881: versions prior to FW11all versionscisa_csaf_otUS
750-882: versions prior to FW11all versionscisa_csaf_otUS
750-885: versions prior to FW11all versionscisa_csaf_otUS
750-889: versions prior to FW11all versionscisa_csaf_otUS
WAGO 750-331/xxx-xxx< FW11cisa_csaf_otUS
WAGO 750-352< FW11cisa_csaf_otUS
WAGO 750-829< FW11cisa_csaf_otUS
WAGO 750-831/xxx-xxx< FW11cisa_csaf_otUS
WAGO 750-852< FW11cisa_csaf_otUS
WAGO 750-880/xxx-xxx< FW11cisa_csaf_otUS
WAGO 750-881< FW11cisa_csaf_otUS
WAGO 750-882< FW11cisa_csaf_otUS
WAGO 750-885< FW11cisa_csaf_otUS
WAGO 750-889< FW11cisa_csaf_otUS

showing 20 of 60

advisories (2)

Vendor and ecosystem advisories describing this.

VDE-2020-042WAGO: PLC families 750-88x and 750-352 prone to DoS attack, versions < FW10 (Update A)2020-10-27csaf · wago_psirtDE
The Web-Based Management (WBM) of WAGOs programmable logic controller (PLC) is typically used for administration, commissioning and updates. Older firmware versions of the PLC family 750-88x and 750-352 are vulnerable for a special denial of service attack. All newer Firmware releases since FW11, released in December 2017, are not affected.
ICSA-20-308-01WAGO Series 750-88x and 750-352 (Update A)2020-11-03icsa · cisa_csaf_otUS
Successful exploitation of this vulnerability could allow an attacker to crash the device being accessed using a denial-of-service attack.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cisa_csaf_ot wago_psirt NVD CVE.org MITRE

published 2020-12-10modified 2026-06-17

references (8)

External citations — patches, advisories, analysis.

https://cert.vde.com/en-us/advisories/vde-2020-042 cnnvd
https://nvd.nist.gov/vuln/detail/CVE-2020-12516 cnnvd
https://us-cert.cisa.gov/ics/advisories/icsa-20-308-01 cnnvd
https://www.auscert.org.au/bulletins/ESB-2020.3794/cnnvd
https://cert.vde.com/en-us/advisories/vde-2020-042 enisa_euvd
https://us-cert.cisa.gov/ics/advisories/icsa-20-308-01 enisa_euvd
https://cert.vde.com/en-us/advisories/vde-2020-042PatchThird Party Advisorynvd
https://us-cert.cisa.gov/ics/advisories/icsa-20-308-01MitigationThird Party AdvisoryUS Government Resourcenvd

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