Vulnerability Database

328,409

Total vulnerabilities in the database

CVE-2021-34568

In WAGO I/O-Check Service in multiple products an unauthenticated remote attacker can send a specially crafted packet containing OS commands to provoke a denial of service.

  • Published: Nov 9, 2022
  • Updated: Nov 16, 2025
  • CVE: CVE-2021-34568
  • Severity: High
  • Exploit:

CVSS v3:

  • Severity: High
  • Score: 7.5
  • AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWEs:

Software From Fixed in
wago / 750-8100_firmware - 18
wago / 750-8100_firmware 18-patch_1 18-patch_1.x
wago / 750-8100_firmware 18-patch_2 18-patch_2.x
wago / 750-8100_firmware 18 18.x
wago / 750-8101_firmware - 18
wago / 750-8101_firmware 18-patch_1 18-patch_1.x
wago / 750-8101_firmware 18-patch_2 18-patch_2.x
wago / 750-8101_firmware 18 18.x
wago / 750-8101/025-000_firmware - 18
wago / 750-8101/025-000_firmware 18-patch_1 18-patch_1.x
wago / 750-8101/025-000_firmware 18-patch_2 18-patch_2.x
wago / 750-8101/025-000_firmware 18 18.x
wago / 750-8102_firmware - 18
wago / 750-8102_firmware 18-patch_1 18-patch_1.x
wago / 750-8102_firmware 18-patch_2 18-patch_2.x
wago / 750-8102_firmware 18 18.x
wago / 750-8102/025-000_firmware - 18
wago / 750-8102/025-000_firmware 18-patch_1 18-patch_1.x
wago / 750-8102/025-000_firmware 18-patch_2 18-patch_2.x
wago / 750-8102/025-000_firmware 18 18.x
wago / 750-8202_firmware - 18
wago / 750-8202_firmware 18-patch_1 18-patch_1.x
wago / 750-8202_firmware 18-patch_2 18-patch_2.x
wago / 750-8202_firmware 18 18.x
wago / 750-8202/000-011_firmware - 18
wago / 750-8202/000-011_firmware 18-patch_1 18-patch_1.x
wago / 750-8202/000-011_firmware 18-patch_2 18-patch_2.x
wago / 750-8202/000-011_firmware 18 18.x
wago / 750-8202/000-012_firmware - 18
wago / 750-8202/000-012_firmware 18-patch_1 18-patch_1.x
wago / 750-8202/000-012_firmware 18-patch_2 18-patch_2.x
wago / 750-8202/000-012_firmware 18 18.x
wago / 750-8202/000-022_firmware - 18
wago / 750-8202/000-022_firmware 18-patch_1 18-patch_1.x
wago / 750-8202/000-022_firmware 18-patch_2 18-patch_2.x
wago / 750-8202/000-022_firmware 18 18.x
wago / 750-8202/025-000_firmware - 18
wago / 750-8202/025-000_firmware 18-patch_1 18-patch_1.x
wago / 750-8202/025-000_firmware 18-patch_2 18-patch_2.x
wago / 750-8202/025-000_firmware 18 18.x
wago / 750-8202/025-001_firmware - 18
wago / 750-8202/025-001_firmware 18-patch_1 18-patch_1.x
wago / 750-8202/025-001_firmware 18-patch_2 18-patch_2.x
wago / 750-8202/025-001_firmware 18 18.x
wago / 750-8202/025-002_firmware - 18
wago / 750-8202/025-002_firmware 18-patch_1 18-patch_1.x
wago / 750-8202/025-002_firmware 18-patch_2 18-patch_2.x
wago / 750-8202/025-002_firmware 18 18.x
wago / 750-8202/040-000_firmware - 18
wago / 750-8202/040-000_firmware 18-patch_1 18-patch_1.x
wago / 750-8202/040-000_firmware 18-patch_2 18-patch_2.x
wago / 750-8202/040-000_firmware 18 18.x
wago / 750-8202/040-001_firmware - 18
wago / 750-8202/040-001_firmware 18-patch_1 18-patch_1.x
wago / 750-8202/040-001_firmware 18-patch_2 18-patch_2.x
wago / 750-8202/040-001_firmware 18 18.x
wago / 752-8303/8000-002_firmware - 18
wago / 752-8303/8000-002_firmware 18-patch_1 18-patch_1.x
wago / 752-8303/8000-002_firmware 18-patch_2 18-patch_2.x
wago / 752-8303/8000-002_firmware 18 18.x
wago / 762-4101_firmware - 18
wago / 762-4101_firmware 18-patch_1 18-patch_1.x
wago / 762-4101_firmware 18-patch_2 18-patch_2.x
wago / 762-4101_firmware 18 18.x
wago / 762-4102_firmware - 18
wago / 762-4102_firmware 18-patch_1 18-patch_1.x
wago / 762-4102_firmware 18-patch_2 18-patch_2.x
wago / 762-4102_firmware 18 18.x
wago / 762-4103_firmware - 18
wago / 762-4103_firmware 18-patch_1 18-patch_1.x
wago / 762-4103_firmware 18-patch_2 18-patch_2.x
wago / 762-4103_firmware 18 18.x
wago / 762-4104_firmware - 18
wago / 762-4104_firmware 18-patch_1 18-patch_1.x
wago / 762-4104_firmware 18-patch_2 18-patch_2.x
wago / 762-4104_firmware 18 18.x
wago / 762-4201/8000-001_firmware - 18
wago / 762-4201/8000-001_firmware 18-patch_1 18-patch_1.x
wago / 762-4201/8000-001_firmware 18-patch_2 18-patch_2.x
wago / 762-4201/8000-001_firmware 18 18.x
wago / 762-4202/8000-001_firmware - 18
wago / 762-4202/8000-001_firmware 18-patch_2 18-patch_2.x
wago / 762-4202/8000-001_firmware 18-patch_1 18-patch_1.x
wago / 762-4202/8000-001_firmware 18 18.x
wago / 762-4203/8000-001_firmware - 18
wago / 762-4203/8000-001_firmware 18-patch_2 18-patch_2.x
wago / 762-4203/8000-001_firmware 18-patch_1 18-patch_1.x
wago / 762-4203/8000-001_firmware 18 18.x
wago / 762-4204/8000-001_firmware - 18
wago / 762-4204/8000-001_firmware 18-patch_1 18-patch_1.x
wago / 762-4204/8000-001_firmware 18-patch_2 18-patch_2.x
wago / 762-4204/8000-001_firmware 18 18.x
wago / 762-4205/8000-001_firmware - 18
wago / 762-4205/8000-001_firmware 18-patch_1 18-patch_1.x
wago / 762-4205/8000-001_firmware 18-patch_2 18-patch_2.x
wago / 762-4205/8000-001_firmware 18 18.x
wago / 762-4205/8000-002_firmware - 18
wago / 762-4205/8000-002_firmware 18-patch_1 18-patch_1.x
wago / 762-4205/8000-002_firmware 18-patch_2 18-patch_2.x
wago / 762-4205/8000-002_firmware 18 18.x
wago / 762-4206/8000-001_firmware - 18
wago / 762-4206/8000-001_firmware 18-patch_1 18-patch_1.x
wago / 762-4206/8000-001_firmware 18-patch_2 18-patch_2.x
wago / 762-4206/8000-001_firmware 18 18.x
wago / 762-4206/8000-002_firmware - 18
wago / 762-4206/8000-002_firmware 18-patch_1 18-patch_1.x
wago / 762-4206/8000-002_firmware 18-patch_2 18-patch_2.x
wago / 762-4206/8000-002_firmware 18 18.x
wago / 762-4301/8000-002_firmware - 18
wago / 762-4301/8000-002_firmware 18-patch_2 18-patch_2.x
wago / 762-4301/8000-002_firmware 18-patch_1 18-patch_1.x
wago / 762-4301/8000-002_firmware 18 18.x
wago / 762-4302/8000-002_firmware - 18
wago / 762-4302/8000-002_firmware 18-patch_1 18-patch_1.x
wago / 762-4302/8000-002_firmware 18-patch_2 18-patch_2.x
wago / 762-4302/8000-002_firmware 18 18.x
wago / 762-4303/8000-002_firmware - 18
wago / 762-4303/8000-002_firmware 18-patch_1 18-patch_1.x
wago / 762-4303/8000-002_firmware 18-patch_2 18-patch_2.x
wago / 762-4303/8000-002_firmware 18 18.x
wago / 762-4304/8000-002_firmware - 18
wago / 762-4304/8000-002_firmware 18-patch_1 18-patch_1.x
wago / 762-4304/8000-002_firmware 18-patch_2 18-patch_2.x
wago / 762-4304/8000-002_firmware 18 18.x
wago / 762-4305/8000-002_firmware - 18
wago / 762-4305/8000-002_firmware 18-patch_1 18-patch_1.x
wago / 762-4305/8000-002_firmware 18-patch_2 18-patch_2.x
wago / 762-4305/8000-002_firmware 18 18.x
wago / 762-4306/8000-002_firmware - 18
wago / 762-4306/8000-002_firmware 18-patch_1 18-patch_1.x
wago / 762-4306/8000-002_firmware 18-patch_2 18-patch_2.x
wago / 762-4306/8000-002_firmware 18 18.x
wago / 762-5203/8000-001_firmware - 18
wago / 762-5203/8000-001_firmware 18-patch_1 18-patch_1.x
wago / 762-5203/8000-001_firmware 18-patch_2 18-patch_2.x
wago / 762-5203/8000-001_firmware 18 18.x
wago / 762-5204/8000-001_firmware - 18
wago / 762-5204/8000-001_firmware 18-patch_1 18-patch_1.x
wago / 762-5204/8000-001_firmware 18-patch_2 18-patch_2.x
wago / 762-5204/8000-001_firmware 18 18.x
wago / 762-5205/8000-001_firmware - 18
wago / 762-5205/8000-001_firmware 18-patch_1 18-patch_1.x
wago / 762-5205/8000-001_firmware 18-patch_2 18-patch_2.x
wago / 762-5205/8000-001_firmware 18 18.x
wago / 762-5206/8000-001_firmware - 18
wago / 762-5206/8000-001_firmware 18-patch_1 18-patch_1.x
wago / 762-5206/8000-001_firmware 18-patch_2 18-patch_2.x
wago / 762-5206/8000-001_firmware 18 18.x
wago / 762-5303/8000-002_firmware - 18
wago / 762-5303/8000-002_firmware 18-patch_1 18-patch_1.x
wago / 762-5303/8000-002_firmware 18-patch_2 18-patch_2.x
wago / 762-5303/8000-002_firmware 18 18.x
wago / 762-5304/8000-002_firmware - 18
wago / 762-5304/8000-002_firmware 18-patch_1 18-patch_1.x
wago / 762-5304/8000-002_firmware 18-patch_2 18-patch_2.x
wago / 762-5304/8000-002_firmware 18 18.x
wago / 762-5305/8000-002_firmware - 18
wago / 762-5305/8000-002_firmware 18-patch_1 18-patch_1.x
wago / 762-5305/8000-002_firmware 18-patch_2 18-patch_2.x
wago / 762-5305/8000-002_firmware 18 18.x
wago / 762-5306/8000-002_firmware - 18
wago / 762-5306/8000-002_firmware 18-patch_1 18-patch_1.x
wago / 762-5306/8000-002_firmware 18-patch_2 18-patch_2.x
wago / 762-5306/8000-002_firmware 18 18.x
wago / 762-6201/8000-001_firmware - 18
wago / 762-6201/8000-001_firmware 18-patch_1 18-patch_1.x
wago / 762-6201/8000-001_firmware 18-patch_2 18-patch_2.x
wago / 762-6201/8000-001_firmware 18 18.x
wago / 762-6202/8000-001_firmware - 18
wago / 762-6202/8000-001_firmware 18-patch_1 18-patch_1.x
wago / 762-6202/8000-001_firmware 18-patch_2 18-patch_2.x
wago / 762-6202/8000-001_firmware 18 18.x
wago / 762-6203/8000-001_firmware - 18
wago / 762-6203/8000-001_firmware 18-patch_1 18-patch_1.x
wago / 762-6203/8000-001_firmware 18-patch_2 18-patch_2.x
wago / 762-6203/8000-001_firmware 18 18.x
wago / 762-6204/8000-001_firmware - 18
wago / 762-6204/8000-001_firmware 18-patch_1 18-patch_1.x
wago / 762-6204/8000-001_firmware 18-patch_2 18-patch_2.x
wago / 762-6204/8000-001_firmware 18 18.x
wago / 762-6301/8000-002_firmware - 18
wago / 762-6301/8000-002_firmware 18-patch_1 18-patch_1.x
wago / 762-6301/8000-002_firmware 18-patch_2 18-patch_2.x
wago / 762-6301/8000-002_firmware 18 18.x
wago / 762-6302/8000-002_firmware - 18
wago / 762-6302/8000-002_firmware 18-patch_1 18-patch_1.x
wago / 762-6302/8000-002_firmware 18-patch_2 18-patch_2.x
wago / 762-6302/8000-002_firmware 18 18.x
wago / 762-6303/8000-002_firmware - 18
wago / 762-6303/8000-002_firmware 18-patch_1 18-patch_1.x
wago / 762-6303/8000-002_firmware 18-patch_2 18-patch_2.x
wago / 762-6303/8000-002_firmware 18 18.x
wago / 762-6304/8000-002_firmware - 18
wago / 762-6304/8000-002_firmware 18-patch_1 18-patch_1.x
wago / 762-6304/8000-002_firmware 18-patch_2 18-patch_2.x
wago / 762-6304/8000-002_firmware 18 18.x

Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.