CVE-2020-28393 Denial of service in SCALANCE XM-400, XR-500
Unauthenticated attackers can cause permanent denial of service on Siemens SCALANCE switches via crafted OSPF packets if OSPF is enabled.
- 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-2020-28393?
CVE-2020-28393 is a high-severity denial of service vulnerability in SCALANCE XM-400, XR-500, published on 12 May 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An unauthenticated remote attacker could create a permanent denial-of-service condition by sending specially crafted OSPF packets. Successful exploitation requires OSPF to be enabled on an affected device on the SCALANCE XM-400, XR-500 (All versions prior to v6.4).
Weakness: CWE-682
Which versions are affected by CVE-2020-28393?
It affects 11 products.
Products include Siemens Scalance Xm-400 Firmware, Siemens Scalance Xm408-4c Firmware, Siemens Scalance Xm408-4c L3 Firmware, Siemens Scalance Xm408-8c Firmware, Siemens Scalance Xm408-8c L3 Firmware, Siemens Scalance Xm416-4c Firmware and 5 more.
How do I fix CVE-2020-28393?
No fix has been published for CVE-2020-28393 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-2020-28393 being exploited?
There is no known exploitation of CVE-2020-28393 in the wild and no public exploit code.
Sources
Also known as GHSA-q5c9-w6w2-m4fw.