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Vulnerability record · CVE-2020-12506 · published 30 September 2020

CVE-2020-12506: Wago 750-362 firmware missing authentication for critical function vulnerability

Wago · 750 362 Firmware

Improper Authentication vulnerability in WAGO 750-8XX series with FW version <= FW03 allows an attacker to change the settings of the devices by sending specifically constructed requests without authentication This issue affects: WAGO 750-362, WAGO 750-363, WAGO 750-823, WAGO 750-832/xxx-xxx, WAGO 750-862, WAGO 750-891, WAGO 750-890/xxx-xxx in versions FW03 and prior versions.

9.1 CVSS 3.1 Critical EPSS 1.5% · top 27.0% CWE-306 · Missing authentication for critical function
9.1CVSS 3.1 base score, v2 6.4
1.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
7Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

Improper Authentication vulnerability in WAGO 750-8XX series with FW version <= FW03 allows an attacker to change the settings of the devices by sending specifically constructed requests without authentication This issue affects: WAGO 750-362, WAGO 750-363, WAGO 750-823, WAGO 750-832/xxx-xxx, WAGO 750-862, WAGO 750-891, WAGO 750-890/xxx-xxx in versions FW03 and prior versions.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Affected products

7 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://cert.vde.com/en-us/advisories/vde-2020-028 Third Party Advisory
https://cert.vde.com/en-us/advisories/vde-2020-028 Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2021-30190Wago 750-893 firmware missing authentication for critical function vulnerabilityCODESYS V2 Web-Server before 1.1.9.20 has Improper Access Control.EPSS 1.4%9.8CVE-2021-30188Wago 750-893 firmware out-of-bounds write vulnerabilityCODESYS V2 runtime system SP before 2.4.7.55 has a Stack-based Buffer Overflow.EPSS 1.3%9.8CVE-2021-30193Wago 750-893 firmware out-of-bounds write vulnerabilityCODESYS V2 Web-Server before 1.1.9.20 has an Out-of-bounds Write.EPSS 1.2%9.8CVE-2021-30189Wago 750-893 firmware out-of-bounds write vulnerabilityCODESYS V2 Web-Server before 1.1.9.20 has a Stack-based Buffer Overflow.EPSS 1.3%9.8CVE-2021-30192Wago 750-893 firmware vulnerabilityCODESYS V2 Web-Server before 1.1.9.20 has an Improperly Implemented Security Check.EPSS 1.2%9.1CVE-2021-34584Wago 750-823 firmware vulnerabilityCrafted web server requests can be utilised to read partial stack or heap memory or may trigger a denial-of- service condition due to a crash in the …EPSS 1.1%9.1CVE-2021-30194Wago 750-893 firmware out-of-bounds read vulnerabilityCODESYS V2 Web-Server before 1.1.9.20 has an Out-of-bounds Read.EPSS 1.2%8.1CVE-2021-34595Wago 750-823 firmware memory buffer overflow vulnerabilityA crafted request with invalid offsets may cause an out-of-bounds read or write access in CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT prior t…EPSS 0.88%

Source: NIST National Vulnerability Database (record CVE-2020-12506), CISA KEV, FIRST EPSS (scores of 2026-10-16). This page is refreshed as NVD updates the record.