CVE-2021-34581 WAGO: Denial of Service vulnerability inside the OpenSSL implementation
An unauthenticated attacker can cause a denial of service on WAGO I/O controllers due to a resource management flaw in the OpenSSL implementation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-34581?
CVE-2021-34581 is a high-severity denial of service vulnerability in WAGO 750-831/xxx-xxx, 750-880/xxx-xxx, 750-881, 750-889, published on 31 Aug 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-772
Which versions are affected by CVE-2021-34581?
It affects 9 products.
Products include Wago 750-831\/000-002 Firmware, Wago 750-831 Firmware, Wago 750-880\/025-000 Firmware, Wago 750-880\/025-001 Firmware, Wago 750-880\/025-002 Firmware, Wago 750-880\/040-000 Firmware and 3 more.
How do I fix CVE-2021-34581?
No fix has been published for CVE-2021-34581 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-34581 being exploited?
There is no known exploitation of CVE-2021-34581 in the wild and no public exploit code.
Sources
Also known as GHSA-v448-m2g5-fm7c.