The JSON encoder in Dovecot before 2.3.5.2 allows attackers to repeatedly crash the authentication service by attempting to authenticate with an invalid UTF-8 sequence as the username.
{
"unresolved_ranges": [
{
"source": "CPE_STRING",
"cpes": [
"cpe:2.3:o:opensuse:leap:15.0:*:*:*:*:*:*:*"
],
"extracted_events": [
{
"last_affected": "15.0"
}
],
"vendor_product": "opensuse:leap"
}
]
}