diff --git a/tests/bash_tests/utils.py b/tests/bash_tests/utils.py
index 95df4894e4..3a3012c3b9 100644
--- a/tests/bash_tests/utils.py
+++ b/tests/bash_tests/utils.py
@@ -14,6 +14,20 @@
 from   urllib import request
 import system_tests
 
+# Run `exiv2 --verbose --version` to find out if the Exiv2 binary is 32-bit or 64-bit.
+def exiv2_is_64bit(bin_dir):
+    proc = subprocess.run(
+        [os.path.join(bin_dir, 'exiv2'), '--verbose', '--version'],
+        stdout=subprocess.PIPE,
+        stderr=subprocess.PIPE,
+        cwd=bin_dir
+    )
+    proc.check_returncode()
+    m = re.search(r'^bits=([0-9]+)\s*$', proc.stdout.decode('utf-8'), re.MULTILINE)
+    numbits = int(m[1])
+    assert numbits in {32, 64}
+    return numbits == 64
+
 
 """
 Part 1:
@@ -43,6 +57,8 @@ class Config:
     if 'VALGRIND' in os.environ:
         valgrind        = os.environ['VALGRIND']
 
+    is_64bit = exiv2_is_64bit(bin_dir)
+
     @classmethod
     def init(cls):
         """ Init test environments and variables that may be modified """
diff --git a/tests/bugfixes/github/test_CVE_2017_14859.py b/tests/bugfixes/github/test_CVE_2017_14859.py
index 01c10df175..c9b267fde2 100644
--- a/tests/bugfixes/github/test_CVE_2017_14859.py
+++ b/tests/bugfixes/github/test_CVE_2017_14859.py
@@ -2,7 +2,6 @@
 
 import system_tests
 
-
 class TestCvePoC(metaclass=system_tests.CaseMeta):
 
     url = "https://github.com/Exiv2/exiv2/issues/74"
@@ -10,9 +9,9 @@ class TestCvePoC(metaclass=system_tests.CaseMeta):
     filename = "$data_path/005-invalid-mem"
     commands = ["$exiv2 " + filename]
     stdout = [""]
-    stderr = ["""$exiv2_exception_message """ + filename + """:
-$kerFailedToReadImageData
-"""]
+    stderr = ["""$exiv2_exception_message """ + filename + ":\n" +
+              ("$kerFailedToReadImageData" if system_tests.BT.Config.is_64bit else "$kerCorruptedMetadata") +
+              "\n"]
     retval = [1]
 
     def compare_stderr(self, i, command, got_stderr, expected_stderr):
diff --git a/tests/bugfixes/github/test_CVE_2017_14862.py b/tests/bugfixes/github/test_CVE_2017_14862.py
index 7b065cde2b..b01a4d4cb3 100644
--- a/tests/bugfixes/github/test_CVE_2017_14862.py
+++ b/tests/bugfixes/github/test_CVE_2017_14862.py
@@ -10,8 +10,14 @@ class TestCvePoC(metaclass=system_tests.CaseMeta):
     filename = "$data_path/008-invalid-mem"
     commands = ["$exiv2 -q " + filename]
 
-    stderr = [""]
-    retval = [0]
+    if system_tests.BT.Config.is_64bit:
+        stderr = [""]
+        retval = [0]
+    else:
+        stderr = ["""$exiv2_exception_message """ + filename + """:
+$kerCorruptedMetadata
+"""]
+        retval = [1]
 
     compare_stdout = check_no_ASAN_UBSAN_errors
 
diff --git a/tests/bugfixes/github/test_CVE_2017_14864.py b/tests/bugfixes/github/test_CVE_2017_14864.py
index 15e88ef24a..f00d83039e 100644
--- a/tests/bugfixes/github/test_CVE_2017_14864.py
+++ b/tests/bugfixes/github/test_CVE_2017_14864.py
@@ -2,7 +2,6 @@
 
 import system_tests
 
-
 class TestCvePoC(metaclass=system_tests.CaseMeta):
 
     url = "https://github.com/Exiv2/exiv2/issues/73"
@@ -10,7 +9,7 @@ class TestCvePoC(metaclass=system_tests.CaseMeta):
     filename = "$data_path/02-Invalid-mem-def"
     commands = ["$exiv2 -q " + filename]
     stdout = [""]
-    stderr = ["""$exiv2_exception_message """ + filename + """:
-$kerFailedToReadImageData
-"""]
+    stderr = ["""$exiv2_exception_message """ + filename + ":\n" +
+              ("$kerFailedToReadImageData" if system_tests.BT.Config.is_64bit else "$kerCorruptedMetadata") +
+              "\n"]
     retval = [1]
diff --git a/tests/bugfixes/github/test_CVE_2018_12265.py b/tests/bugfixes/github/test_CVE_2018_12265.py
index 735e67ceaa..50d74b598e 100644
--- a/tests/bugfixes/github/test_CVE_2018_12265.py
+++ b/tests/bugfixes/github/test_CVE_2018_12265.py
@@ -2,7 +2,6 @@
 
 import system_tests
 
-
 class AdditionOverflowInLoaderExifJpeg(metaclass=system_tests.CaseMeta):
     """
     Regression test for bug #365:
@@ -17,6 +16,7 @@ class AdditionOverflowInLoaderExifJpeg(metaclass=system_tests.CaseMeta):
         """Error: Upper boundary of data for directory Image, entry 0x00fe is out of bounds: Offset = 0x0000002a, size = 64, exceeds buffer size by 22 Bytes; truncating the entry
 Warning: Directory Image, entry 0x0201: Strip 0 is outside of the data area; ignored.
 Warning: Directory Image, entry 0x0201: Strip 7 is outside of the data area; ignored.
-"""
+""" +
+        ("" if system_tests.BT.Config.is_64bit else "Uncaught exception: Overflow in addition\n")
     ]
-    retval = [0]
+    retval = [0 if system_tests.BT.Config.is_64bit else 1]