diff --git a/include/haproxy/server-t.h b/include/haproxy/server-t.h
index 32697a9..f404d30 100644
--- a/include/haproxy/server-t.h
+++ b/include/haproxy/server-t.h
@@ -311,6 +311,7 @@
 		} * reused_sess;
 
 		struct ckch_inst *inst; /* Instance of the ckch_store in which the certificate was loaded (might be null if server has no certificate) */
+		__decl_thread(HA_RWLOCK_T lock); /* lock the cache and SSL_CTX during commit operations */
 
 		char *ciphers;			/* cipher suite to use if non-null */
 #ifdef HAVE_SSL_CTX_SET_CIPHERSUITES
diff --git a/include/haproxy/thread.h b/include/haproxy/thread.h
index e4d630d..9982a76 100644
--- a/include/haproxy/thread.h
+++ b/include/haproxy/thread.h
@@ -398,6 +398,7 @@
 	PROTO_LOCK,
 	CKCH_LOCK,
 	SNI_LOCK,
+	SSL_SERVER_LOCK,
 	SFT_LOCK, /* sink forward target */
 	OTHER_LOCK,
 	LOCK_LABELS
diff --git a/src/server.c b/src/server.c
index da2325e..453c598 100644
--- a/src/server.c
+++ b/src/server.c
@@ -1775,6 +1775,9 @@
 #endif
 
 	srv->extra_counters = NULL;
+#ifdef USE_OPENSSL
+	HA_RWLOCK_INIT(&srv->ssl_ctx.lock);
+#endif
 
 	/* please don't put default server settings here, they are set in
 	 * init_default_instance().
diff --git a/src/ssl_ckch.c b/src/ssl_ckch.c
index f9b8f18..f654b4b 100644
--- a/src/ssl_ckch.c
+++ b/src/ssl_ckch.c
@@ -1400,14 +1400,11 @@
 					/* The bind_conf will be null on server ckch_instances. */
 					if (ckchi->is_server_instance) {
 						int i;
-
-						/* The certificate update on the server side (backend)
-						 * can be done by rewriting a single pointer so no
-						 * locks are needed here. */
+						/* a lock is needed here since we have to free the SSL cache */
+						HA_RWLOCK_WRLOCK(SSL_SERVER_LOCK, &ckchi->server->ssl_ctx.lock);
 						/* free the server current SSL_CTX */
 						SSL_CTX_free(ckchi->server->ssl_ctx.ctx);
 						/* Actual ssl context update */
-						thread_isolate();
 						SSL_CTX_up_ref(ckchi->ctx);
 						ckchi->server->ssl_ctx.ctx = ckchi->ctx;
 						ckchi->server->ssl_ctx.inst = ckchi;
@@ -1417,7 +1414,7 @@
 							free(ckchi->server->ssl_ctx.reused_sess[i].ptr);
 							ckchi->server->ssl_ctx.reused_sess[i].ptr = NULL;
 						}
-						thread_release();
+						HA_RWLOCK_WRUNLOCK(SSL_SERVER_LOCK, &ckchi->server->ssl_ctx.lock);
 
 					} else {
 						HA_RWLOCK_WRLOCK(SNI_LOCK, &ckchi->bind_conf->sni_lock);
diff --git a/src/ssl_sock.c b/src/ssl_sock.c
index 099e7f9..db5b019 100644
--- a/src/ssl_sock.c
+++ b/src/ssl_sock.c
@@ -3984,11 +3984,16 @@
 
 	s = __objt_server(conn->target);
 
+	/* RWLOCK: only read lock the SSL cache even when writing in it because there is
+	 * one cache per thread, it only prevents to flush it from the CLI in
+	 * another thread */
+
 	if (!(s->ssl_ctx.options & SRV_SSL_O_NO_REUSE)) {
 		int len;
 		unsigned char *ptr;
 
 		len = i2d_SSL_SESSION(sess, NULL);
+		HA_RWLOCK_RDLOCK(SSL_SERVER_LOCK, &s->ssl_ctx.lock);
 		if (s->ssl_ctx.reused_sess[tid].ptr && s->ssl_ctx.reused_sess[tid].allocated_size >= len) {
 			ptr = s->ssl_ctx.reused_sess[tid].ptr;
 		} else {
@@ -4000,9 +4005,12 @@
 			s->ssl_ctx.reused_sess[tid].size = i2d_SSL_SESSION(sess,
 			    &ptr);
 		}
+		HA_RWLOCK_RDUNLOCK(SSL_SERVER_LOCK, &s->ssl_ctx.lock);
 	} else {
+		HA_RWLOCK_RDLOCK(SSL_SERVER_LOCK, &s->ssl_ctx.lock);
 		free(s->ssl_ctx.reused_sess[tid].ptr);
 		s->ssl_ctx.reused_sess[tid].ptr = NULL;
+		HA_RWLOCK_RDUNLOCK(SSL_SERVER_LOCK, &s->ssl_ctx.lock);
 	}
 
 	return 0;
@@ -5265,6 +5273,7 @@
 			goto err;
 
 		SSL_set_connect_state(ctx->ssl);
+		HA_RWLOCK_RDLOCK(SSL_SERVER_LOCK, &(__objt_server(conn->target)->ssl_ctx.lock));
 		if (__objt_server(conn->target)->ssl_ctx.reused_sess[tid].ptr) {
 			const unsigned char *ptr = __objt_server(conn->target)->ssl_ctx.reused_sess[tid].ptr;
 			SSL_SESSION *sess = d2i_SSL_SESSION(NULL, &ptr, __objt_server(conn->target)->ssl_ctx.reused_sess[tid].size);
@@ -5276,6 +5285,7 @@
 				SSL_SESSION_free(sess);
 			}
 		}
+		HA_RWLOCK_RDUNLOCK(SSL_SERVER_LOCK, &(__objt_server(conn->target)->ssl_ctx.lock));
 
 		/* leave init state and start handshake */
 		conn->flags |= CO_FL_SSL_WAIT_HS | CO_FL_WAIT_L6_CONN;
@@ -5658,9 +5668,18 @@
 	ERR_clear_error();
 
 	/* free resumed session if exists */
-	if (objt_server(conn->target) && __objt_server(conn->target)->ssl_ctx.reused_sess[tid].ptr) {
-		free(__objt_server(conn->target)->ssl_ctx.reused_sess[tid].ptr);
-		__objt_server(conn->target)->ssl_ctx.reused_sess[tid].ptr = NULL;
+	if (objt_server(conn->target)) {
+		struct server *s = __objt_server(conn->target);
+		/* RWLOCK: only rdlock the SSL cache even when writing in it because there is
+		 * one cache per thread, it only prevents to flush it from the CLI in
+		 * another thread */
+
+		HA_RWLOCK_RDLOCK(SSL_SERVER_LOCK, &s->ssl_ctx.lock);
+		if (s->ssl_ctx.reused_sess[tid].ptr) {
+			free(s->ssl_ctx.reused_sess[tid].ptr);
+			s->ssl_ctx.reused_sess[tid].ptr = NULL;
+		}
+		HA_RWLOCK_RDUNLOCK(SSL_SERVER_LOCK, &s->ssl_ctx.lock);
 	}
 
 	if (counters) {