WAGO: OpenSSL DoS Vulnerability in PLCs
WAGO controllers have always been designed for easy connection to IT infrastructure. Even controllers from legacy product lines support encryption standards to ensure secure communication. With special crafted requests it is possible to bring the device out of operation. All listed devices are vulnerable for this denial of service attack.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2021-34581US | high7.5 | — | ||
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 a… | ||||
references
External citations — patches, advisories, analysis.
remediations (2)
- 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 configuration phase.
- Fixed
Update the device to the latest FW version.
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