CVE-2020-12505

mediumpriority · track · 26OT risk · elevatedEPSS 0.012 · 69 %ileDEEURUUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
1.25% (69th) EPSS
CVSS 6.4 · medium
Is it mine?
35 products
Check your exposure
Who says so?
5 sources
cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-27

Improper Authentication vulnerability in WAGO 750-8XX series with FW version <= FW07 allows an attacker to change some special parameters without authentication. This issue affects: WAGO 750-852, WAGO 750-880/xxx-xxx, WAGO 750-881, WAGO 750-831/xxx-xxx, WAGO 750-882, WAGO 750-885/xxx-xxx, WAGO 750-889 in versions FW07 and below.

01

remediations

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

A vendor fix is available.

  • Fixedwago_psirt

    Upgrade affected devices to the latest standard firmware.

  • Mitigationwago_psirt

    Mitigation Restrict network access to the device. Do not directly connect the device to the internet. Disable unused TCP/UDP ports. Disable web-based management ports 80/443 after the configuration phase

02

cvss

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

9.1
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–critical · 5.4–9.1

v2.06.4mediumAV:N/AC:L/Au:N/C:N/I:P/A:Pprimary · NVD / NIST USexploitability 10 · impact 4.9
v2.05.4mediumAV:N/AC:L/Au:N/C:N/I:P/A:P/E:Usecondary · CVSS-BT (t0sche)
v3.19.1criticalAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Hsecondary · FSTEC (BDU) RU
v3.18.2highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Hsecondary · info@cert.vde.comexploitability 3.9 · impact 4.2
v3.18.2highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Hsecondary · WAGO PSIRT DE
v3.18.2highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Hsecondary · ENISA EU
v3.19.1criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Hsecondary · NVD / NIST USexploitability 3.9 · impact 5.2
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-287USCWE-287USCWE-306US
04

affected products (35)

Products and version ranges known to be affected.

showing 20 of 35
05

advisories (1)

Vendor and ecosystem advisories describing this.

  • VDE-2020-027WAGO: Vulnerability in web-based authentication in WAGO 750-8XX Version <= FW072020-09-30csaf · wago_psirtDE

    The Web-Based Management (WBM) of WAGOs programmable logic controller (PLC) is typically used for administration, commissioning and updates. With special crafted requests it is possible to change some special parameters without authentication.

06

also known as (4)

Other names and identifiers for this entity.

07

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bdunvdwago_psirtNVDCVE.orgMITRE
published 2020-09-30modified 2026-06-17
08

references (4)

External citations — patches, advisories, analysis.

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