CVE-2017-3231 in Java SE
Summary
by MITRE
Vulnerability in the Java SE, Java SE Embedded component of Oracle Java SE (subcomponent: Networking). Supported versions that are affected are Java SE: 6u131, 7u121 and 8u112; Java SE Embedded: 8u111. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Java SE, Java SE Embedded. Successful attacks require human interaction from a person other than the attacker. Successful attacks of this vulnerability can result in unauthorized read access to a subset of Java SE, Java SE Embedded accessible data. Note: This vulnerability applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. This vulnerability does not apply to Java deployments, typically in servers, that load and run only trusted code (e.g., code installed by an administrator). CVSS v3.0 Base Score 4.3 (Confidentiality impacts).
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Analysis
by VulDB Data Team • 05/15/2026
The vulnerability identified as CVE-2017-3231 represents a significant security flaw within Oracle Java SE and Java SE Embedded platforms, specifically within the networking component of these Java implementations. This weakness manifests in versions 6u131, 7u121, and 8u112 for standard Java SE, alongside 8u111 for Java SE Embedded, creating a persistent threat across multiple Java runtime environments. The vulnerability's classification as easily exploitable indicates that attackers can leverage network-based attacks without requiring authentication, making it particularly dangerous in environments where Java applications are frequently executed with internet-based code sources.
The technical nature of this vulnerability stems from insufficient validation mechanisms within Java's networking stack, allowing attackers to potentially access sensitive data through network protocols. The flaw operates under the Common Weakness Enumeration framework as a weakness related to improper input validation, specifically within network communication handling. The attack requires minimal prerequisites beyond network access and can be executed through multiple protocols, demonstrating the broad applicability of this security gap. However, the vulnerability's exploitation necessitates human interaction from users other than the attacker, suggesting that social engineering or user deception plays a role in successful compromise scenarios.
The operational impact of CVE-2017-3231 extends beyond simple data exposure, as it enables unauthorized read access to specific subsets of data within Java SE and Java SE Embedded environments. This confidentiality breach affects the core security model of Java applications, particularly those running in sandboxed environments where trust boundaries are established. The vulnerability's implications are most severe in client-side deployments where Java Web Start applications or applets execute untrusted code from internet sources, undermining the fundamental security assumptions of the Java sandbox architecture. According to ATT&CK framework categorization, this vulnerability maps to techniques involving privilege escalation and credential access through network-based exploitation methods.
Organizations utilizing affected Java versions face substantial risk in environments where users regularly interact with internet-based Java applications, particularly those running in browser applet contexts or Java Web Start scenarios. The vulnerability's applicability to sandboxed client environments means that even if administrators implement strict server-side controls, client-side deployments remain susceptible to this attack vector. Security professionals should recognize that this vulnerability does not affect server-side Java implementations that execute only trusted code, but rather specifically targets the client-side execution model where user interaction with untrusted internet code is common. The CVSS v3.0 base score of 4.3 indicates a moderate severity level that reflects the potential for unauthorized data access while acknowledging that the attack requires user interaction to complete successfully.
Mitigation strategies should focus on immediate patching of affected Java versions, implementing network segmentation to limit exposure, and establishing strict policies regarding Java execution in client environments. Organizations must also consider disabling Java applets and Web Start applications in browsers where possible, as these execution contexts are particularly vulnerable to this class of attack. The remediation process should include comprehensive vulnerability assessments of Java deployments to identify all affected systems and ensure that appropriate security controls are implemented to prevent exploitation of this networking-based vulnerability.