A cross-site request forgery flaw was found in etcd 3.3.1 and earlier. An attacker can set up a website that tries to send a POST request to the etcd server and modify a key. Adding a key is done with PUT so it is theoretically safe (can't PUT from an HTML form or such) but POST allows creating in-order keys that an attacker can send.
{
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*"
],
"extracted_events": [
{
"last_affected": "30"
}
],
"source": "CPE_FIELD",
"vendor_product": "fedoraproject:fedora"
}
]
}{
"extracted_events": [
{
"introduced": "0"
},
{
"last_affected": "3.3.1"
}
],
"source": "CPE_FIELD",
"cpe": "cpe:2.3:a:redhat:etcd:*:*:*:*:*:*:*:*"
}