CVE-2020-2604 in Commerce Guided Search
Summary
by MITRE
Vulnerability in the Java SE, Java SE Embedded product of Oracle Java SE (component: Serialization). Supported versions that are affected are Java SE: 7u241, 8u231, 11.0.5 and 13.0.1; Java SE Embedded: 8u231. Difficult to exploit vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Java SE, Java SE Embedded. Successful attacks of this vulnerability can result in takeover of Java SE, Java SE Embedded. Note: This vulnerability applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets (in Java SE 8), that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. This vulnerability can also be exploited by using APIs in the specified Component, e.g., through a web service which supplies data to the APIs. CVSS v3.0 Base Score 8.1 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H).
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Analysis
by VulDB Data Team • 01/21/2026
The vulnerability identified as CVE-2020-2604 represents a critical serialization flaw within Oracle Java SE and Java SE Embedded platforms, specifically targeting the serialization component of the Java runtime environment. This vulnerability manifests in multiple supported versions including Java SE 7u241, 8u231, 11.0.5, and 13.0.1, alongside Java SE Embedded 8u231, creating a widespread impact across various Java deployment scenarios. The vulnerability's classification as difficult to exploit yet highly dangerous stems from its ability to be leveraged by unauthenticated attackers who gain network access through multiple protocols, making it particularly concerning for environments where Java applications are exposed to external networks. The CVSS v3.0 score of 8.1 reflects the severe impact across confidentiality, integrity, and availability domains, indicating that successful exploitation could result in complete system compromise of Java SE and Java SE Embedded environments.
The technical nature of this vulnerability lies within the Java serialization mechanism, which is a fundamental component responsible for converting Java objects into a byte stream for transmission or storage and subsequently reconstructing them. When an attacker can manipulate serialized data, they can potentially execute arbitrary code within the Java runtime environment, bypassing the security boundaries that typically protect applications from malicious inputs. This particular flaw enables attackers to exploit the serialization process through various attack vectors including web services and sandboxed applications, making it particularly dangerous for environments where untrusted code execution is permitted. The vulnerability's exploitation requires minimal privileges and can be executed without user interaction, as indicated by the CVSS vector showing no requirement for user interaction or privilege escalation. The attack surface expands significantly when considering that Java Web Start applications and Java applets in sandboxed environments often rely on the serialization component for data exchange, creating multiple potential entry points for exploitation.
The operational impact of CVE-2020-2604 extends far beyond simple data corruption or system instability, as successful exploitation can result in complete takeover of affected Java SE and Java SE Embedded systems. This level of compromise allows attackers to execute arbitrary code with the privileges of the Java runtime process, potentially leading to full system compromise, data exfiltration, and persistence mechanisms. Organizations running Java applications that process untrusted data through serialization APIs face significant risk, particularly those with web services that accept serialized input from external sources. The vulnerability particularly affects environments where Java applets or Web Start applications are deployed in sandboxed environments, as these applications often handle untrusted data while relying on serialization for communication. The widespread nature of this vulnerability means that organizations across various industries, from financial services to healthcare and government sectors, may be exposed to significant security risks if their systems are running affected Java versions.
Mitigation strategies for CVE-2020-2604 must address both immediate remediation and long-term architectural security improvements. Organizations should prioritize applying the official Oracle patches and updates released for the affected Java versions, as these patches specifically address the serialization flaw in the Java runtime. Additionally, implementing network segmentation and access controls can help limit the attack surface by restricting network access to Java applications and services. The principle of least privilege should be enforced by ensuring that Java applications run with minimal necessary permissions and that serialization APIs are properly validated and sanitized before processing untrusted input. Organizations should also consider implementing application firewalls or intrusion detection systems to monitor for suspicious serialization activity and potential exploitation attempts. From a defensive perspective, the vulnerability aligns with ATT&CK techniques related to code injection and privilege escalation, specifically targeting the T1059.007 (Command and Scripting Interpreter: PowerShell) and T1068 (Exploitation for Privilege Escalation) techniques. The vulnerability also relates to CWE-502 which describes deserialization of untrusted data, making it a prime example of how insecure deserialization can lead to complete system compromise. Regular security assessments and penetration testing should be conducted to identify and remediate similar vulnerabilities in custom Java applications that utilize serialization mechanisms.