--- lib/IO/Socket/SSL.pm

+++ lib/IO/Socket/SSL.pm

@@ -172,11 +172,10 @@ my %DEFAULT_SSL_ARGS = (

     SSL_npn_protocols => undef,    # meaning depends whether on server or client side

     SSL_alpn_protocols => undef,   # list of protocols we'll accept/send, for example ['http/1.1','spdy/3.1']

-    # https://wiki.mozilla.org/Security/Server_Side_TLS, 2019/03/05

-    # "Old backward compatibility" for best compatibility

-    # .. "Most ciphers that are not clearly broken and dangerous to use are supported"

-    # slightly reordered to prefer AES since it is cheaper when hardware accelerated

-    SSL_cipher_list => 'ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:ECDHE-RSA-DES-CBC3-SHA:ECDHE-ECDSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:DES-CBC3-SHA:HIGH:SEED:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!RSAPSK:!aDH:!aECDH:!EDH-DSS-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA:!SRP',

+    # Use system-wide default cipher list to support use of system-wide

+    # crypto policy (#1076390, #1127577, CPAN RT#97816)

+    # https://fedoraproject.org/wiki/Changes/CryptoPolicy

+    SSL_cipher_list => 'DEFAULT',

 );

 my %DEFAULT_SSL_CLIENT_ARGS = (

@@ -186,63 +185,6 @@ my %DEFAULT_SSL_CLIENT_ARGS = (

     SSL_ca_file => undef,

     SSL_ca_path => undef,

-    # older versions of F5 BIG-IP hang when getting SSL client hello >255 bytes

-    # http://support.f5.com/kb/en-us/solutions/public/13000/000/sol13037.html

-    # http://guest:guest@rt.openssl.org/Ticket/Display.html?id=2771

-    # Ubuntu worked around this by disabling TLSv1_2 on the client side for

-    # a while. Later a padding extension was added to OpenSSL to work around

-    # broken F5 but then IronPort croaked because it did not understand this

-    # extension so it was disabled again :(

-    # Firefox, Chrome and IE11 use TLSv1_2 but use only a few ciphers, so

-    # that packet stays small enough. We try the same here.

-

-    SSL_cipher_list => join(" ",

-

-	# SSLabs report for Chrome 48/OSX. 

-	# This also includes the fewer ciphers Firefox uses.

-	'ECDHE-ECDSA-AES128-GCM-SHA256',

-	'ECDHE-RSA-AES128-GCM-SHA256',

-	'DHE-RSA-AES128-GCM-SHA256',

-	'ECDHE-ECDSA-CHACHA20-POLY1305',

-	'ECDHE-RSA-CHACHA20-POLY1305',

-	'ECDHE-ECDSA-AES256-SHA',

-	'ECDHE-RSA-AES256-SHA',

-	'DHE-RSA-AES256-SHA',

-	'ECDHE-ECDSA-AES128-SHA',

-	'ECDHE-RSA-AES128-SHA',

-	'DHE-RSA-AES128-SHA',

-	'AES128-GCM-SHA256',

-	'AES256-SHA',

-	'AES128-SHA',

-	'DES-CBC3-SHA',

-

-	# IE11/Edge has some more ciphers, notably SHA384 and DSS

-	# we don't offer the *-AES128-SHA256 and *-AES256-SHA384 non-GCM

-	# ciphers IE/Edge offers because they look like a large mismatch

-	# between a very strong HMAC and a comparably weak (but sufficient)

-	# encryption. Similar all browsers which do SHA384 can do ECDHE

-	# so skip the DHE*SHA384 ciphers.

-	'ECDHE-RSA-AES256-GCM-SHA384',

-	'ECDHE-ECDSA-AES256-GCM-SHA384',

-	# 'ECDHE-RSA-AES256-SHA384',

-	# 'ECDHE-ECDSA-AES256-SHA384',

-	# 'ECDHE-RSA-AES128-SHA256',

-	# 'ECDHE-ECDSA-AES128-SHA256',

-	# 'DHE-RSA-AES256-GCM-SHA384',

-	# 'AES256-GCM-SHA384',

-	'AES256-SHA256',

-	# 'AES128-SHA256',

-	'DHE-DSS-AES256-SHA256',

-	# 'DHE-DSS-AES128-SHA256',

-	'DHE-DSS-AES256-SHA',

-	'DHE-DSS-AES128-SHA',

-	'EDH-DSS-DES-CBC3-SHA',

-

-	# Just to make sure, that we don't accidentally add bad ciphers above.

-	# This includes dropping RC4 which is no longer supported by modern

-	# browsers and also excluded in the SSL libraries of Python and Ruby.

-	"!EXP !MEDIUM !LOW !eNULL !aNULL !RC4 !DES !MD5 !PSK !SRP"

-    )

 );

 # set values inside _init to work with perlcc, RT#95452

--- lib/IO/Socket/SSL.pod

+++ lib/IO/Socket/SSL.pod

@@ -1054,12 +1054,8 @@ documentation (L

 for more details.

 Unless you fail to contact your peer because of no shared ciphers it is

-recommended to leave this option at the default setting. The default setting

-prefers ciphers with forward secrecy, disables anonymous authentication and

-disables known insecure ciphers like MD5, DES etc. This gives a grade A result

-at the tests of SSL Labs.

-To use the less secure OpenSSL builtin default (whatever this is) set

-SSL_cipher_list to ''.

+recommended to leave this option at the default setting, which honors the

+system-wide DEFAULT cipher list.

 In case different cipher lists are needed for different SNI hosts a hash can be

 given with the host as key and the cipher suite as value, similar to