diff --git a/package/dovecot/0001-auth-Fix-handling-passdbs-with-identical-driver-args.patch b/package/dovecot/0001-auth-Fix-handling-passdbs-with-identical-driver-args.patch
new file mode 100644
index 0000000000..04b8f5392a
--- /dev/null
+++ b/package/dovecot/0001-auth-Fix-handling-passdbs-with-identical-driver-args.patch
@@ -0,0 +1,136 @@
+From 7bad6a24160e34bce8f10e73dbbf9e5fbbcd1904 Mon Sep 17 00:00:00 2001
+From: Timo Sirainen <timo.sirainen@open-xchange.com>
+Date: Mon, 9 May 2022 15:23:33 +0300
+Subject: [PATCH] auth: Fix handling passdbs with identical driver/args but
+ different mechanisms/username_filter
+
+The passdb was wrongly deduplicated in this situation, causing wrong
+mechanisms or username_filter setting to be used. This would be a rather
+unlikely configuration though.
+
+Fixed by moving mechanisms and username_filter from struct passdb_module
+to struct auth_passdb, which is where they should have been in the first
+place.
+
+Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
+---
+ src/auth/auth-request.c | 6 +++---
+ src/auth/auth.c | 18 ++++++++++++++++++
+ src/auth/auth.h | 5 +++++
+ src/auth/passdb.c | 15 ++-------------
+ src/auth/passdb.h | 4 ----
+ 5 files changed, 28 insertions(+), 20 deletions(-)
+
+diff --git a/src/auth/auth-request.c b/src/auth/auth-request.c
+index cd08b1fa02..0ca29f3674 100644
+--- a/src/auth/auth-request.c
++++ b/src/auth/auth-request.c
+@@ -534,8 +534,8 @@ auth_request_want_skip_passdb(struct auth_request *request,
+ struct auth_passdb *passdb)
+ {
+ /* if mechanism is not supported, skip */
+- const char *const *mechs = passdb->passdb->mechanisms;
+- const char *const *username_filter = passdb->passdb->username_filter;
++ const char *const *mechs = passdb->mechanisms;
++ const char *const *username_filter = passdb->username_filter;
+ const char *username;
+
+ username = request->fields.user;
+@@ -548,7 +548,7 @@ auth_request_want_skip_passdb(struct auth_request *request,
+ return TRUE;
+ }
+
+- if (passdb->passdb->username_filter != NULL &&
++ if (passdb->username_filter != NULL &&
+ !auth_request_username_accepted(username_filter, username)) {
+ auth_request_log_debug(request,
+ request->mech != NULL ? AUTH_SUBSYS_MECH
+diff --git a/src/auth/auth.c b/src/auth/auth.c
+index f2f3fda20c..9f6c4ba60c 100644
+--- a/src/auth/auth.c
++++ b/src/auth/auth.c
+@@ -99,6 +99,24 @@ auth_passdb_preinit(struct auth *auth, const struct auth_passdb_settings *set,
+ auth_passdb->override_fields_tmpl =
+ passdb_template_build(auth->pool, set->override_fields);
+
++ if (*set->mechanisms == '\0') {
++ auth_passdb->mechanisms = NULL;
++ } else if (strcasecmp(set->mechanisms, "none") == 0) {
++ auth_passdb->mechanisms = (const char *const[]){ NULL };
++ } else {
++ auth_passdb->mechanisms =
++ (const char *const *)p_strsplit_spaces(auth->pool,
++ set->mechanisms, " ,");
++ }
++
++ if (*set->username_filter == '\0') {
++ auth_passdb->username_filter = NULL;
++ } else {
++ auth_passdb->username_filter =
++ (const char *const *)p_strsplit_spaces(auth->pool,
++ set->username_filter, " ,");
++ }
++
+ /* for backwards compatibility: */
+ if (set->pass)
+ auth_passdb->result_success = AUTH_DB_RULE_CONTINUE;
+diff --git a/src/auth/auth.h b/src/auth/auth.h
+index f700e29d5c..460a179765 100644
+--- a/src/auth/auth.h
++++ b/src/auth/auth.h
+@@ -41,6 +41,11 @@ struct auth_passdb {
+ struct passdb_template *default_fields_tmpl;
+ struct passdb_template *override_fields_tmpl;
+
++ /* Supported authentication mechanisms, NULL is all, {NULL} is none */
++ const char *const *mechanisms;
++ /* Username filter, NULL is no filter */
++ const char *const *username_filter;
++
+ enum auth_passdb_skip skip;
+ enum auth_db_rule result_success;
+ enum auth_db_rule result_failure;
+diff --git a/src/auth/passdb.c b/src/auth/passdb.c
+index eb4ac8ae82..f5eed1af4f 100644
+--- a/src/auth/passdb.c
++++ b/src/auth/passdb.c
+@@ -224,19 +224,8 @@ passdb_preinit(pool_t pool, const struct auth_passdb_settings *set)
+ passdb->id = ++auth_passdb_id;
+ passdb->iface = *iface;
+ passdb->args = p_strdup(pool, set->args);
+- if (*set->mechanisms == '\0') {
+- passdb->mechanisms = NULL;
+- } else if (strcasecmp(set->mechanisms, "none") == 0) {
+- passdb->mechanisms = (const char *const[]){NULL};
+- } else {
+- passdb->mechanisms = (const char* const*)p_strsplit_spaces(pool, set->mechanisms, " ,");
+- }
+-
+- if (*set->username_filter == '\0') {
+- passdb->username_filter = NULL;
+- } else {
+- passdb->username_filter = (const char* const*)p_strsplit_spaces(pool, set->username_filter, " ,");
+- }
++ /* NOTE: if anything else than driver & args are added here,
++ passdb_find() also needs to be updated. */
+ array_push_back(&passdb_modules, &passdb);
+ return passdb;
+ }
+diff --git a/src/auth/passdb.h b/src/auth/passdb.h
+index 2e95328e5c..e466a9fdb6 100644
+--- a/src/auth/passdb.h
++++ b/src/auth/passdb.h
+@@ -63,10 +63,6 @@ struct passdb_module {
+ /* Default password scheme for this module.
+ If default_cache_key is set, must not be NULL. */
+ const char *default_pass_scheme;
+- /* Supported authentication mechanisms, NULL is all, [NULL] is none*/
+- const char *const *mechanisms;
+- /* Username filter, NULL is no filter */
+- const char *const *username_filter;
+
+ /* If blocking is set to TRUE, use child processes to access
+ this passdb. */
+--
+2.30.2
+
diff --git a/package/dovecot/dovecot.mk b/package/dovecot/dovecot.mk
index 7619250985..e28f500b7b 100644
--- a/package/dovecot/dovecot.mk
+++ b/package/dovecot/dovecot.mk
@@ -21,6 +21,9 @@ DOVECOT_DEPENDENCIES = \
# is part of the Red Hat packaging and not part of upstream dovecot
DOVECOT_IGNORE_CVES += CVE-2016-4983
+# 0001-auth-Fix-handling-passdbs-with-identical-driver-args.patch
+DOVECOT_IGNORE_CVES += CVE-2022-30550
+
DOVECOT_CONF_ENV = \
RPCGEN=__disable_RPCGEN_rquota \
i_cv_epoll_works=yes \