CVE-2018-7851 Denial of service in Modicon M580 with firmware prior to V2.50 Modicon M340 with firmware prior to V3.01 BMxCRA312xx with firmware prior to V2.40 All firmware versions of Modicon Premium and 140CRA312xxx
A buffer error in Modicon PLC firmware allows remote attackers to cause a denial of service via crafted Modbus packets, requiring a device restart.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2018-7851?
CVE-2018-7851 is a medium-severity denial of service vulnerability in Modicon M580 with firmware prior to V2.50 Modicon M340 with firmware prior to V3.01 BMxCRA312xx with firmware prior to V2.40 All firmware versions of Modicon Premium and 140CRA312xxx, published on 22 May 2019. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
CWE-119: Buffer errors vulnerability exists in Modicon M580 with firmware prior to V2.50, Modicon M340 with firmware prior to V3.01, BMxCRA312xx with firmware prior to V2.40, All firmware versions of Modicon Premium and 140CRA312xxx when sending a specially crafted Modbus packet, which could cause a denial of service to the device that would force a restart to restore availability.
Weakness: CWE-119
Which versions are affected by CVE-2018-7851?
It affects 5 products.
Products include Schneider-Electric 140cra312xxx Firmware, Schneider-Electric Bmx\/E Cra Firmware, Schneider-Electric M340 Firmware, Schneider-Electric M580 Firmware, Schneider-Electric Modicon Premium Firmware.
How do I fix CVE-2018-7851?
No fix has been published for CVE-2018-7851 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-2018-7851 being exploited?
There is no known exploitation of CVE-2018-7851 in the wild and no public exploit code.
Sources
Also known as GHSA-prwp-rh6x-cr5m.