CVE-2021-22816 Denial of service in n/a
A remote attacker can cause a Denial of Service on SCADAPack RTUs by sending a specially crafted Modbus request when the device is configured as a Modbus server.
- 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-2021-22816?
CVE-2021-22816 is a high-severity denial of service vulnerability in n/a, published on 28 Jan 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists that could cause a Denial of Service of the RTU when receiving a specially crafted request over Modbus, and the RTU is configured as a Modbus server. Affected Products: SCADAPack 312E, 313E, 314E, 330E, 333E, 334E, 337E, 350E and 357E RTUs with firmware V8.18.1 and prior
Weakness: CWE-754
Which versions are affected by CVE-2021-22816?
It affects 9 products.
Products include Schneider-Electric Scadapack 312e Firmware, Schneider-Electric Scadapack 313e Firmware, Schneider-Electric Scadapack 314e Firmware, Schneider-Electric Scadapack 330e Firmware, Schneider-Electric Scadapack 333e Firmware, Schneider-Electric Scadapack 334e Firmware and 3 more.
How do I fix CVE-2021-22816?
No fix has been published for CVE-2021-22816 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-2021-22816 being exploited?
There is no known exploitation of CVE-2021-22816 in the wild and no public exploit code.
Sources
Also known as GHSA-x4x8-fc23-7gg9.