diff -up openssl-1.1.0f/apps/s_client.c.disable-ssl3 openssl-1.1.0f/apps/s_client.c
--- openssl-1.1.0f/apps/s_client.c.disable-ssl3	2017-06-05 15:42:44.838853312 +0200
+++ openssl-1.1.0f/apps/s_client.c	2017-07-17 14:50:06.468821871 +0200
@@ -1486,6 +1486,9 @@ int s_client_main(int argc, char **argv)
     if (sdebug)
         ssl_ctx_security_debug(ctx, sdebug);
 
+    if (min_version == SSL3_VERSION && max_version == SSL3_VERSION)
+        SSL_CTX_clear_options(ctx, SSL_OP_NO_SSLv3);
+
     if (ssl_config) {
         if (SSL_CTX_config(ctx, ssl_config) == 0) {
             BIO_printf(bio_err, "Error using configuration \"%s\"\n",
diff -up openssl-1.1.0f/apps/s_server.c.disable-ssl3 openssl-1.1.0f/apps/s_server.c
--- openssl-1.1.0f/apps/s_server.c.disable-ssl3	2017-05-25 14:46:18.000000000 +0200
+++ openssl-1.1.0f/apps/s_server.c	2017-07-17 14:49:50.434447583 +0200
@@ -1614,6 +1614,10 @@ int s_server_main(int argc, char *argv[]
     }
     if (sdebug)
         ssl_ctx_security_debug(ctx, sdebug);
+
+    if (min_version == SSL3_VERSION && max_version == SSL3_VERSION)
+        SSL_CTX_clear_options(ctx, SSL_OP_NO_SSLv3);
+
     if (ssl_config) {
         if (SSL_CTX_config(ctx, ssl_config) == 0) {
             BIO_printf(bio_err, "Error using configuration \"%s\"\n",
diff -up openssl-1.1.0/ssl/ssl_lib.c.disable-ssl3 openssl-1.1.0/ssl/ssl_lib.c
--- openssl-1.1.0/ssl/ssl_lib.c.disable-ssl3	2016-08-25 17:29:22.000000000 +0200
+++ openssl-1.1.0/ssl/ssl_lib.c	2016-09-08 11:08:05.252082263 +0200
@@ -2470,6 +2470,13 @@ SSL_CTX *SSL_CTX_new(const SSL_METHOD *m
      * or by using the SSL_CONF library.
      */
     ret->options |= SSL_OP_NO_COMPRESSION;
+    /*
+     * Disable SSLv3 by default.  Applications can
+     * re-enable it by configuring
+     * SSL_CTX_clear_options(ctx, SSL_OP_NO_SSLv3);
+     * or by using the SSL_CONF library.
+     */
+    ret->options |= SSL_OP_NO_SSLv3;
 
     ret->tlsext_status_type = -1;
 
diff -up openssl-1.1.0/test/ssl_test.c.disable-ssl3 openssl-1.1.0/test/ssl_test.c
--- openssl-1.1.0/test/ssl_test.c.disable-ssl3	2016-09-08 11:08:05.252082263 +0200
+++ openssl-1.1.0/test/ssl_test.c	2016-09-08 11:11:44.802005886 +0200
@@ -258,6 +258,7 @@ static int execute_test(SSL_TEST_FIXTURE
             SSL_TEST_SERVERNAME_CB_NONE) {
             server2_ctx = SSL_CTX_new(TLS_server_method());
             TEST_check(server2_ctx != NULL);
+            SSL_CTX_clear_options(server2_ctx, SSL_OP_NO_SSLv3);
         }
         client_ctx = SSL_CTX_new(TLS_client_method());
 
@@ -266,11 +267,15 @@ static int execute_test(SSL_TEST_FIXTURE
             resume_client_ctx = SSL_CTX_new(TLS_client_method());
             TEST_check(resume_server_ctx != NULL);
             TEST_check(resume_client_ctx != NULL);
+            SSL_CTX_clear_options(resume_server_ctx, SSL_OP_NO_SSLv3);
+            SSL_CTX_clear_options(resume_client_ctx, SSL_OP_NO_SSLv3);
         }
     }
 
     TEST_check(server_ctx != NULL);
     TEST_check(client_ctx != NULL);
+    SSL_CTX_clear_options(server_ctx, SSL_OP_NO_SSLv3);
+    SSL_CTX_clear_options(client_ctx, SSL_OP_NO_SSLv3);
 
     TEST_check(CONF_modules_load(conf, fixture.test_app, 0) > 0);
 
diff -up openssl-1.1.0/test/ssltest_old.c.disable-ssl3 openssl-1.1.0/test/ssltest_old.c
--- openssl-1.1.0/test/ssltest_old.c.disable-ssl3	2016-08-25 17:29:23.000000000 +0200
+++ openssl-1.1.0/test/ssltest_old.c	2016-09-08 11:08:05.253082286 +0200
@@ -1456,6 +1456,11 @@ int main(int argc, char *argv[])
         ERR_print_errors(bio_err);
         goto end;
     }
+
+    SSL_CTX_clear_options(c_ctx, SSL_OP_NO_SSLv3);
+    SSL_CTX_clear_options(s_ctx, SSL_OP_NO_SSLv3);
+    SSL_CTX_clear_options(s_ctx2, SSL_OP_NO_SSLv3);
+
     /*
      * Since we will use low security ciphersuites and keys for testing set
      * security level to zero by default. Tests can override this by adding