How severe is CVE-2023-21835?

CVE-2023-21835 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2023-21835 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-21835?

CVE-2023-21835 primarily affects Oracle Graalvm. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-21835?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2023-21835 published?

CVE-2023-21835 was published on 2023-01-18 and last updated on 2026-06-17.

CVE-2023-21835

CVE-2023-21835 is a medium-severity vulnerability in Oracle Graalvm with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Oracle Graalvm
Published: 2023-01-18
Last modified: 2026-06-17

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).

Frequently asked questions

What is CVE-2023-21835?: 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).
How severe is CVE-2023-21835?: CVE-2023-21835 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2023-21835 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-21835?: CVE-2023-21835 primarily affects Oracle Graalvm. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-21835?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-21835 published?: CVE-2023-21835 was published on 2023-01-18 and last updated on 2026-06-17.

References

Affected products (14)

cpe:2.3:a:oracle:graalvm:20.3.8:*:*:*:enterprise:*:*:*
cpe:2.3:a:oracle:graalvm:21.3.4:*:*:*:enterprise:*:*:*
cpe:2.3:a:oracle:graalvm:22.3.0:*:*:*:enterprise:*:*:*
cpe:2.3:a:oracle:jdk:11.0.17:*:*:*:*:*:*:*
cpe:2.3:a:oracle:jdk:17.0.5:*:*:*:*:*:*:*
cpe:2.3:a:oracle:jdk:19.0.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:jre:11.0.17:*:*:*:*:*:*:*
cpe:2.3:a:oracle:jre:17.0.5:*:*:*:*:*:*:*
cpe:2.3:a:oracle:jre:19.0.1:*:*:*:*:*:*:*
cpe:2.3:a:azul:zulu:11.60:*:*:*:*:*:*:*
cpe:2.3:a:azul:zulu:13.52:*:*:*:*:*:*:*
cpe:2.3:a:azul:zulu:15.44:*:*:*:*:*:*:*
cpe:2.3:a:azul:zulu:17.38:*:*:*:*:*:*:*
cpe:2.3:a:azul:zulu:19.30:*:*:*:*:*:*:*

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