The Shadowserver Foundation

Open Memcached Key-Value Store Scanning Project

If you are looking at this page, then more than likely, you noticed a scan coming from this server across your network and/or poking at the Memcached server service.

The Shadowserver Foundation is currently undertaking a project to search for publicly accessible devices that have the Memcached service running. The goal of this project is to identify openly accessible systems that have Memcached running and report them back to the network owners for remediation.

This service does not support authentication which means any entity that can access the Memcached instance can have complete control over the key-value store.

Memcached servers that we have found to be accessible have been incorporated into our reports and are being reported on a daily basis.

Methodology

We are querying all computers with routable IPv4 addresses that are not firewalled from the internet on port 11211/tcp with the command "stats" and capturing the response. We intend no harm, but if we are causing problems, please contact us at gro [tod] revfooreswodahs [ta] nacbarssnd

If you would like to test your own device to see if it has Memcached accessible, try the command: "nc [IP] 11211" and type in "stats" (without the quotes), followed by a carriage return. If Memcached is running, expect to see information about the Memcached server appear on your screen. If your system does not have the command "nc", it may also be called "netcat".

Whitelisting

To be removed from this set of scanning you will need to send an email to dnsscan [at] shadowserver [dot] org with the specific CIDR's that you would like to have removed. You will have to be the verifiable owner of these CIDR's and be able to prove that fact. Any address space that is whitelisted will be publicly available here: https://memcachedscan.shadowserver.org/exclude.html

Useful Links

Scan Status

Statistics on current run

Other Statistics

Stats from the most current scan are listed below.


All devices with Memcached Accessible

All memcached

(Click image to enlarge)

If you would like to see more regions click here

All devices with Memcached Accessible

All memcached

(Click image to enlarge)



If you would like us to not scan your network, please let us know and we will remove your networks from the scan.

Likewise, if you have anymore questions please feel free to send us an email at: gro [tod] revfooreswodahs [ta] nacbarssnd

The Shadowserver Foundation