CVE-2021-25666 Denial of service in SCALANCE W780 and W740 (IEEE 802.11n) family
An attacker can cause a partial denial-of-service on Siemens SCALANCE wireless devices by sending specially crafted ARP packets.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-25666?
CVE-2021-25666 is a medium-severity denial of service vulnerability in Siemens SCALANCE W780 and W740 (IEEE 802.11n) family, published on 9 Feb 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability has been identified in SCALANCE W780 and W740 (IEEE 802.11n) family (All versions < V6.3). Sending specially crafted packets through the ARP protocol to an affected device could cause a partial denial-of-service, preventing the device to operate normally for a short period of time.
Weakness: CWE-770
Which versions are affected by CVE-2021-25666?
It affects 2 products.
Products include Siemens Scalance W740 Firmware, Siemens Scalance W780 Firmware.
How do I fix CVE-2021-25666?
No fix has been published for CVE-2021-25666 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-2021-25666 being exploited?
There is no known exploitation of CVE-2021-25666 in the wild and no public exploit code.
Sources
Also known as GHSA-462j-78vj-jjpr.