diff --git a/tools/aegis4j/build.gradle b/tools/aegis4j/build.gradle
index 3d3d4ebeb2..b179618b11 100644
--- a/tools/aegis4j/build.gradle
+++ b/tools/aegis4j/build.gradle
@@ -30,7 +30,6 @@ dependencies {
     testImplementation('log4j:apache-log4j-extras:1.2.17') {
         exclude group: 'log4j', module: 'log4j'
     }
-    // testImplementation group: 'com.ea.agentloader', name: 'ea-agent-loader', version: '1.0.3'
     testImplementation "com.google.guava:guava:$guava_version"
     testImplementation "org.yaml:snakeyaml:1.33"
 }
diff --git a/tools/aegis4j/src/test/java/net/gredler/aegis4j/CVE_2020_8908.java b/tools/aegis4j/src/test/java/net/gredler/aegis4j/CVE_2020_8908.java
new file mode 100644
index 0000000000..0a526b16aa
--- /dev/null
+++ b/tools/aegis4j/src/test/java/net/gredler/aegis4j/CVE_2020_8908.java
@@ -0,0 +1,30 @@
+/* Copyright (c) 2022, Daniel Gredler. All rights reserved. */
+
+package net.gredler.aegis4j;
+
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.fail;
+
+/**
+ * Tests Guava blocking.
+ */
+public class CVE_2020_8908 {
+    @AfterAll
+    public static void uninstallAgent() throws Exception {
+        System.clearProperty("aegis4j.additional.args");
+    }
+
+    @Test
+    public void test() throws Exception {
+        TestUtils.installAgent("path=../resources/test/guava-mods.properties");
+        try {
+            com.google.common.io.Files.createTempDir();
+            fail("Exception expected");
+        } catch (RuntimeException e) {
+            assertEquals("Guava createTempDir blocked by aegis4j", e.getMessage());
+        }
+    }
+}
diff --git a/tools/aegis4j/src/test/resources/guava-mods.properties b/tools/aegis4j/src/test/resources/guava-mods.properties
new file mode 100644
index 0000000000..4646669410
--- /dev/null
+++ b/tools/aegis4j/src/test/resources/guava-mods.properties
@@ -0,0 +1,3 @@
+# format: <feature>.<class-name>.<method-name>=<replacement-code>
+# CVE-2020-8908
+GUAVA.com.google.common.io.Files.createTempDir=throw new java.lang.RuntimeException("Guava createTempDir blocked by aegis4j");
\ No newline at end of file