The Sieve engine in Dovecot before 2.3.15 allows Uncontrolled Resource Consumption, as demonstrated by a situation with a complex regular expression for the regex extension.
{
"unresolved_ranges": [
{
"source": "CPE_FIELD",
"cpe": "cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*",
"extracted_events": [
{
"last_affected": "33"
}
]
},
{
"source": "CPE_FIELD",
"cpe": "cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*",
"extracted_events": [
{
"last_affected": "34"
}
]
}
]
}