CVE-2023-21835 Denial of service in Java SE JDK and JRE
An unauthenticated attacker can cause a partial denial of service in Oracle Java SE and GraalVM via DTLS, affecting client-side Java deployments.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-21835?
CVE-2023-21835 is a medium-severity denial of service 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: JSSE). Supported versions that are affected are Oracle Java SE: 11.0.17, 17.0.5, 19.0.1; Oracle GraalVM Enterprise Edition: 20.3.8, 21.3.4 and 22.3.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via DTLS to compromise Oracle Java SE, Oracle GraalVM Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized ability to cause a partial denial of service (partial DOS) of Oracle Java SE, Oracle GraalVM Enterprise Edition. 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 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).
Which versions are affected by CVE-2023-21835?
3 open source packages ship an affected version, including java, java-min and jre. It affects 4 products.
| Package | Affected | Fixed in |
|---|---|---|
java Bitnami | From 9.0.0 | 11.0.18, 17.0.5, 19.0.2 |
java-min Bitnami | From 9.0.0 | 11.0.18, 17.0.5, 19.0.2 |
jre Bitnami | From 9.0.0 | 11.0.18, 17.0.5, 19.0.2 |
Products include Azul Zulu, Oracle Graalvm, Oracle Jdk, Oracle Jre.
How do I fix CVE-2023-21835?
Upgrade java to a fixed version for your release line: 11.0.18, 17.0.5 or 19.0.2.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2023-21835 being exploited?
There is no known exploitation of CVE-2023-21835 in the wild and no public exploit code.
Other vulnerabilities in Oracle Graalvm
Sources
Also known as BIT-java-2023-21835, BIT-java-min-2023-21835, BIT-jre-2023-21835, CLEANSTART-2026-RL66109, DEBIAN-CVE-2023-21835, GHSA-wqgc-h828-9g98 and 8 more.