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Vulnerability record · CVE-2021-34569 · published 9 November 2022

CVE-2021-34569: Wago 750-8100 firmware out-of-bounds write vulnerability

Wago · 750 8100 Firmware

In WAGO I/O-Check Service in multiple products an attacker can send a specially crafted packet containing OS commands to crash the diagnostic tool and write memory.

9.8 CVSS 3.1 Critical EPSS 0.86% · top 43.3% CWE-787 · Out-of-bounds write
9.8CVSS 3.1 base score
0.86%EPSS exploitation probability, 30 days
NoNot in CISA KEV
49Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

In WAGO I/O-Check Service in multiple products an attacker can send a specially crafted packet containing OS commands to crash the diagnostic tool and write memory.

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

Affected products

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

References

LinkTags
https://cert.vde.com/en/advisories/VDE-2020-036/ Third Party Advisory
https://cert.vde.com/en/advisories/VDE-2020-036/ Third Party Advisory

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Related vulnerabilities

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

9.1CVE-2021-34566Wago 750-8100 firmware classic buffer overflow vulnerabilityIn WAGO I/O-Check Service in multiple products an unauthenticated remote attacker can send a specially crafted packet containing OS commands to crash…EPSS 1.1%8.2CVE-2021-34567Wago 750-8100 firmware out-of-bounds read vulnerabilityIn WAGO I/O-Check Service in multiple products an unauthenticated remote attacker can send a specially crafted packet containing OS commands to provo…EPSS 0.82%7.8CVE-2020-12069Pilz pmc vulnerabilityIn CODESYS V3 products in all versions prior V3.5.16.0 containing the CmpUserMgr, the CODESYS Control runtime system stores the online communication …EPSS 0.16%7.5CVE-2021-34568Wago 750-8100 firmware allocation without limits vulnerabilityIn WAGO I/O-Check Service in multiple products an unauthenticated remote attacker can send a specially crafted packet containing OS commands to provo…EPSS 1.1%7.5CVE-2022-3281Wago 750-8100 firmware vulnerabilityWAGO Series PFC100/PFC200, Series Touch Panel 600, Compact Controller CC100 and Edge Controller in multiple versions are prone to a loss of MAC-Addre…EPSS 0.73%5.4CVE-2022-22511Wago 750-8100 firmware cross-site scripting vulnerabilityVarious configuration pages of the device are vulnerable to reflected XSS (Cross-Site Scripting) attacks. An authorized attacker with user privileges…EPSS 0.56%8.8CVE-2026-53266Linux kernel ebtables SNAT out-of-bounds write in ARP rewriteThe ebtables SNAT target rewrites the ARP sender hardware address via skb_store_bits() without first making that range writable. When the ARP SHA byt…KEVEPSS 0.65%analysed8.8CVE-2026-87491Google Chrome V8 out-of-bounds write enables sandbox code executionChrome before 153.0.8010.36 contains an out-of-bounds write in the V8 JavaScript engine. A crafted HTML page can trigger the memory corruption, and b…KEVEPSS 3.1%analysed

Source: NIST National Vulnerability Database (record CVE-2021-34569), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.