CVE-2019-6829 Denial of service in Modicon M340
Attackers can cause denial of service in Schneider Modicon PLCs by writing to specific memory addresses via Modbus.
- 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-2019-6829?
CVE-2019-6829 is a high-severity denial of service vulnerability in Schneider Electric SE Modicon M340, published on 17 Sep 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A CWE-248: Uncaught Exception vulnerability exists in Modicon M580 (firmware version prior to V2.90) and Modicon M340 (firmware version prior to V3.10), which could cause a possible denial of service when writing to specific memory addresses in the controller over Modbus.
Which versions are affected by CVE-2019-6829?
It affects 2 products.
Products include Schneider-Electric Modicon M340 Firmware, Schneider-Electric Modicon M580 Firmware.
How do I fix CVE-2019-6829?
No fix has been published for CVE-2019-6829 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-2019-6829 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-6829 exists.
Other vulnerabilities in Schneider Electric SE Modicon M340
- CVE-2018-7842 Auth bypass in Modicon M580 Modicon M340 Modicon Quantum Modicon Premium
- CVE-2018-7846 Auth bypass in Modicon M580 Modicon M340 Modicon Quantum Modicon Premium
- CVE-2018-7847 Missing authorization in Modicon M580 Modicon M340 Modicon Quantum Modicon Premium
- CVE-2019-6808 Missing authorization in Modicon M580 Modicon M340 Modicon Quantum Modicon Premium
- CVE-2019-6845 Information disclosure in Modicon M580, Modicon M340, Modicon Premium , Modicon Quantum (all firmware versions)
Sources
Also known as GHSA-25r4-295r-fvqm.