CVE-2002-2281 in Java! JIT Compiler
Summary
by MITRE
Symantec Java! JIT (Just-In-Time) Compiler for Netscape Communicator 4.0 through 4.8 allows remote attackers to execute arbitrary Java commands via an applet that uses a jump call, which is not correctly compiled by the JIT compiler.
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Analysis
by VulDB Data Team • 07/12/2025
The vulnerability identified as CVE-2002-2281 represents a critical security flaw in the Symantec Java Just-In-Time compiler implementation within Netscape Communicator versions 4.0 through 4.8. This issue stems from improper handling of jump calls during the JIT compilation process, creating a significant vector for remote code execution attacks. The vulnerability specifically affects the Java applet execution environment where the JIT compiler fails to properly validate or process certain jump instructions, allowing malicious code to bypass normal security restrictions.
The technical flaw manifests when a malicious Java applet containing a specially crafted jump call is executed within the vulnerable browser environment. The Symantec JIT compiler incorrectly processes these jump instructions, leading to unpredictable execution behavior that can be exploited by attackers. This miscompilation allows arbitrary Java commands to be executed with the privileges of the user running the browser, effectively breaking the security boundaries that normally isolate applet execution from the underlying system. The vulnerability is classified under CWE-119 as a weakness involving memory access violations and improper input validation, specifically targeting the Java bytecode compilation phase.
The operational impact of this vulnerability is severe as it enables remote attackers to execute arbitrary code on vulnerable systems without requiring any local privileges or user interaction beyond visiting a malicious website. Attackers can craft malicious applets that exploit the JIT compiler flaw to perform actions such as reading system files, executing system commands, or establishing backdoor connections. The vulnerability affects a wide range of users since Netscape Communicator 4.0 through 4.8 was widely deployed in enterprise and consumer environments during the early 2000s. This attack vector aligns with ATT&CK technique T1059.007 for application execution and T1203 for exploitation for privilege escalation, as the flaw allows for code execution that can be leveraged to gain elevated system privileges.
Mitigation strategies for this vulnerability include immediate patching of the Symantec JIT compiler component or upgrading to newer versions of Netscape Communicator that contain fixed compiler implementations. Organizations should also implement network-level restrictions to block access to potentially malicious applet content and disable Java applet execution entirely when not required for business operations. Browser security settings should be configured to restrict applet execution to trusted sites only, and regular security audits should verify that no vulnerable versions remain in the network infrastructure. The vulnerability demonstrates the critical importance of proper bytecode validation and compilation in sandboxed environments, as flaws in JIT compilers can fundamentally compromise the security model of entire application platforms.