diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 9cc76709b..24169944b 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -73,6 +73,7 @@ Pierre-Luc Tessier Gagné
 Ronald Evers
 Ronny Pfannschmidt
 Selim Belhaouane
+Sorin Sbarnea
 Sridhar Ratnakumar
 Stephen Finucane
 Sviatoslav Sydorenko
diff --git a/docs/changelog/1437.bugfix.rst b/docs/changelog/1437.bugfix.rst
new file mode 100644
index 000000000..0c12646ec
--- /dev/null
+++ b/docs/changelog/1437.bugfix.rst
@@ -0,0 +1 @@
+Adds ``CURL_CA_BUNDLE``, ``REQUESTS_CA_BUNDLE``, ``SSL_CERT_FILE`` to the default passenv values. - by :user:`ssbarnea`
diff --git a/docs/config.rst b/docs/config.rst
index 5b35d50e8..8d9dbb74a 100644
--- a/docs/config.rst
+++ b/docs/config.rst
@@ -385,8 +385,10 @@ Complete list of settings that you can put into ``testenv*`` sections:
     Some variables are always passed through to ensure the basic functionality
     of standard library functions or tooling like pip:
 
-    * passed through on all platforms: ``PATH``, ``LANG``, ``LANGUAGE``,
-      ``LD_LIBRARY_PATH``, ``PIP_INDEX_URL``
+    * passed through on all platforms: ``CURL_CA_BUNDLE`, ``PATH``,
+      ``LANG``, ``LANGUAGE``,
+      ``LD_LIBRARY_PATH``, ``PIP_INDEX_URL``,
+      ``REQUESTS_CA_BUNDLE``, ``SSL_CERT_FILE``
     * Windows: ``SYSTEMDRIVE``, ``SYSTEMROOT``, ``PATHEXT``, ``TEMP``, ``TMP``
        ``NUMBER_OF_PROCESSORS``, ``USERPROFILE``, ``MSYSTEM``
     * Others (e.g. UNIX, macOS): ``TMPDIR``
diff --git a/src/tox/config/__init__.py b/src/tox/config/__init__.py
index 76df09e6d..fe93d25ce 100644
--- a/src/tox/config/__init__.py
+++ b/src/tox/config/__init__.py
@@ -664,11 +664,14 @@ def passenv(testenv_config, value):
         value = list(itertools.chain.from_iterable([x.split(" ") for x in value]))
 
         passenv = {
-            "PATH",
-            "PIP_INDEX_URL",
+            "CURL_CA_BUNDLE",
             "LANG",
             "LANGUAGE",
             "LD_LIBRARY_PATH",
+            "PATH",
+            "PIP_INDEX_URL",
+            "REQUESTS_CA_BUNDLE",
+            "SSL_CERT_FILE",
             "TOX_WORK_DIR",
             str(REPORTER_TIMESTAMP_ON_ENV),
             str(PARALLEL_ENV_VAR_KEY_PUBLIC),
diff --git a/tests/unit/config/test_config.py b/tests/unit/config/test_config.py
index 0d31974e0..7fad51aea 100644
--- a/tests/unit/config/test_config.py
+++ b/tests/unit/config/test_config.py
@@ -1069,8 +1069,11 @@ def test_passenv_as_multiline_list(self, newconfig, monkeypatch, plat):
             assert "MSYSTEM" in envconfig.passenv
         else:
             assert "TMPDIR" in envconfig.passenv
+        assert "CURL_CA_BUNDLE" in envconfig.passenv
         assert "PATH" in envconfig.passenv
         assert "PIP_INDEX_URL" in envconfig.passenv
+        assert "REQUESTS_CA_BUNDLE" in envconfig.passenv
+        assert "SSL_CERT_FILE" in envconfig.passenv
         assert "LANG" in envconfig.passenv
         assert "LANGUAGE" in envconfig.passenv
         assert "LD_LIBRARY_PATH" in envconfig.passenv
diff --git a/tox.ini b/tox.ini
index fcb1418cf..af9a4ca5d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -19,7 +19,14 @@ description = run the tests with pytest under {basepython}
 setenv = PIP_DISABLE_VERSION_CHECK = 1
          COVERAGE_FILE = {env:COVERAGE_FILE:{toxworkdir}/.coverage.{envname}}
          VIRTUALENV_NO_DOWNLOAD = 1
-passenv = http_proxy https_proxy no_proxy SSL_CERT_FILE PYTEST_*
+passenv =
+    CURL_CA_BUNDLE
+    http_proxy
+    https_proxy
+    no_proxy
+    REQUESTS_CA_BUNDLE
+    SSL_CERT_FILE
+    PYTEST_*
 deps = pip == 19.1.1
 extras = testing
 commands = pytest \