CVE-2023-21830 Deserialization in Java SE JDK and JRE

What is CVE-2023-21830?

CVE-2023-21830 is a medium-severity unsafe deserialization vulnerability in Oracle Graalvm, published on 17 Jan 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Vulnerability in the Oracle Java SE, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: Serialization). Supported versions that are affected are Oracle Java SE: 8u351, 8u351-perf; Oracle GraalVM Enterprise Edition: 20.3.8 and 21.3.4. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, 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 Enterprise Edition 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 3.1 Base Score 5.3 (Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N).

Which versions are affected by CVE-2023-21830?

3 open source packages ship an affected version, including java, java-min and jre. It affects 5 products.

Products include Azul Zulu, Oracle Communications Unified Assurance, Oracle Graalvm, Oracle Jdk, Oracle Jre.

How do I fix CVE-2023-21830?

Upgrade java to a fixed version for your release line: 1.8.0 or 8.0.361.

Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.

Is CVE-2023-21830 being exploited?

There is no known exploitation of CVE-2023-21830 in the wild and no public exploit code.

Other vulnerabilities in Oracle Graalvm

• CVE-2022-21449 Other in Java SE JDK and JRE High 7.5
• CVE-2022-21476 Information disclosure in Java SE JDK and JRE High 7.5
• CVE-2022-21541 Other in Java SE JDK and JRE Medium 5.9
• CVE-2023-21835 Denial of service in Java SE JDK and JRE Medium 5.3
• CVE-2022-21618 Auth bypass in Java SE JDK and JRE Medium 5.3

All Oracle Graalvm vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-java-2023-21830, BIT-java-min-2023-21830, BIT-jre-2023-21830, CLEANSTART-2026-LG84885, DEBIAN-CVE-2023-21830, GHSA-xw85-qpwr-ch8h and 6 more.