title: WAGO: Denial of Service vulnerability inside the OpenSSL implementation
description: Missing Release of Resource after Effective Lifetime vulnerability in OpenSSL implementation of WAGO 750-831/xxx-xxx, 750-880/xxx-xxx, 750-881, 750-889 in versions FW4 up to FW15 allows an unauthenticated attacker to cause DoS on the device.
problem types: CWE-772 Missing Release of Resource after Effective Lifetime
affected:
{
product: 750-831/xxx-xxx, 750-880/xxx-xxx, 750-881, 750-889
vendor: WAGO
versions:
lessThan: All*, status: affected, version: FW4, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 7.5
baseSeverity: HIGH
confidentialityImpact: NONE
integrityImpact: NONE
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
version: 3.1
]
solutions: Update the device to the latest FW version ( >FW15 ).
workarounds: 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 configuration phase.