diff -up evolution-data-server-3.28.5/src/camel/providers/imapx/camel-imapx-server.c.CVE-2020-16117 evolution-data-server-3.28.5/src/camel/providers/imapx/camel-imapx-server.c
--- evolution-data-server-3.28.5/src/camel/providers/imapx/camel-imapx-server.c.CVE-2020-16117	2018-07-30 15:17:06.000000000 +0200
+++ evolution-data-server-3.28.5/src/camel/providers/imapx/camel-imapx-server.c	2020-09-30 09:10:32.240788043 +0200
@@ -2979,7 +2979,8 @@ connected:
 
 			/* See if we got new capabilities
 			 * in the STARTTLS response. */
-			imapx_free_capability (is->priv->cinfo);
+			if (is->priv->cinfo)
+				imapx_free_capability (is->priv->cinfo);
 			is->priv->cinfo = NULL;
 			if (ic->status->condition == IMAPX_CAPABILITY) {
 				is->priv->cinfo = ic->status->u.cinfo;