CVE-2021-22699 Denial of service in Modicon M241/M251 logic controllers firmware prior to V5.1.9.1
Attackers can cause denial of service on Modicon M241/M251 logic controllers by sending crafted HTTP requests, impacting industrial control operations.
- 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-2021-22699?
CVE-2021-22699 is a high-severity denial of service vulnerability in Modicon M241/M251 logic controllers firmware prior to V5.1.9.1, published on 26 May 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Improper Input Validation vulnerability exists in Modicon M241/M251 logic controllers firmware prior to V5.1.9.1 that could cause denial of service when specific crafted requests are sent to the controller over HTTP.
Weakness: CWE-20
Which versions are affected by CVE-2021-22699?
It affects 2 products.
Products include Schneider-Electric Modicon M241 Firmware, Schneider-Electric Modicon M251 Firmware.
How do I fix CVE-2021-22699?
No fix has been published for CVE-2021-22699 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-2021-22699 being exploited?
There is no known exploitation of CVE-2021-22699 in the wild and no public exploit code.
Other vulnerabilities in Modicon M241/M251 logic controllers firmware prior to V5.1.9.1
Sources
Also known as GHSA-6vx6-7ghj-3776.