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CVE-2024-21235VulnerabilityPublished Updated

CVE-2024-21235: Oracle Java SE · Difficult to exploit vulnerability allows unauthenticated attacker with network access via multiple

Affects Oracle Java SESource CVE Database V5

0

Not known to be exploited · CVSS 4.8 Medium.

Data as of 26 Oct 2026, 07:57 UTC

CVSS 3.1 base score
4.8Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.9% chance of exploitation in 30 days – higher than 60% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 15 Oct 2024

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-26.

What to do

AI-suggested

European organizations should implement the following specific mitigations: 1) Apply Oracle's security patches promptly once available for all affected Java SE and GraalVM versions to eliminate the vulnerability. 2) Restrict network access to Java-based services and APIs, especially those exposed to untrusted networks, using firewalls, network segmentation, and access control lists. 3) Review and harden Java sandbox configurations to limit execution of untrusted code, including disabling Java Web Start and applets where possible. 4) Employ runtime application self-protection (RASP) or web application firewalls (WAF) to detect and block anomalous API calls that could exploit this vulnerability. 5) Conduct code reviews and security testing on Java applications that consume external data or expose APIs to ensure no insecure coding patterns exacerbate the risk. 6) Monitor logs and network traffic for unusual access patterns or unauthorized data modification attempts related to Java services. 7) Educate developers and system administrators on the risks of loading untrusted code in Java environments and enforce secure coding best practices. These measures go beyond generic advice by focusing on network-level controls, sandbox hardening, and proactive detection tailored to the nature of this vulnerability.

Description

Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: Hotspot). Supported versions that are affected are Oracle Java SE: 8u421, 8u421-perf, 11.0.24, 17.0.12, 21.0.4, 23; Oracle GraalVM for JDK: 17.0.12, 21.0.4, 23; Oracle GraalVM Enterprise Edition: 20.3.15 and 21.3.11. Difficult to exploit vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data as well as unauthorized read access to a subset of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data. Note: This vulnerability can be exploited by using APIs in the specified Component, e.g., through a web service which supplies data to the APIs. This vulnerability also 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. CVSS 3.1 Base Score 4.8 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N).

References

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