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CVE-2023-21939 Oracle Java SE

Affected softwareOracle Java SE
Affected versionsOracle Java SE: 8u361, 8u361-perf, 11.0.18, 17.0.6, 20; Oracle GraalVM Enterprise Edition: 20.3.9, 21.3.5, 22.3.1
Severity5.3 Medium CVSS 3.1
Fixed inOracle Critical Patch Update April 2023
Published18 Apr 2023
Updated17 Jun 2026

Description

Vulnerability in the Oracle Java SE, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: Swing). Supported versions that are affected are Oracle Java SE: 8u361, 8u361-perf, 11.0.18, 17.0.6, 20; Oracle GraalVM Enterprise Edition: 20.3.9, 21.3.5 and 22.3.1. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP 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 can also be exploited by using APIs in the specified Component, e.g., through a web service which supplies data to the APIs. 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).

Exploitation status

Proof of concept only

A proof of concept exists, but no reviewed exploit catalogue lists this CVE.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC 1 indexed Published artifacts you can open, in GitHub PoC; first seen 2023-08-26.
  • EPSS 2.5% chance in 30 days
IndexArtifactStarsFirst seen
GitHub PoC JDK CVE-2023-21939 92 2023-08-26

Waratek protection

Protected by Waratek

Waratek has a rule that blocks attacks on this vulnerability.

  • Protection full
  • Action available patch rule
  • Review human ARMR file
  • Record active
Decided by An ARMR patch file on disk for this CVE
Finding CVE has an ARMR patch rule that provides mitigation

ARMR rule files

1 file

The rule files Waratek ships for this CVE. Some CVEs need more than one, for example one per affected library or one per ARMR version.

CVE-2023-21939.armr patch rule, ARMR 2.6 added 2023-05-09 updated 2026-03-04

How to mitigate CVE-2023-21939

Apply the fix in Oracle Critical Patch Update April 2023. Until you can, Waratek RASP blocks exploitation with a rule written for this CVE. It runs inside the Java application, with no code changes.

Waratek RASP Runtime protection for Java applications

Affected software and releases

Oracle advisories

AdvisoryTypeQuarterProducts Oracle names in its risk matrix
Oracle Critical Patch Update April 2023 ↗ CPU 2023-Q2 Oracle Java SE / Swing (Oracle Java SE: 8u361, 8u361-perf, 11.0.18, 17.0.6, 20; Oracle GraalVM Enterprise Edition: 20.3.9, 21.3.5, 22.3.1)
Oracle's 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 can also be exploited by using APIs in the specified Component, e.g., through a web service which supplies data to the APIs.

Oracle components and versions

FamilyComponentVersions, as Oracle lists themRead as
Oracle Java SE Swing Oracle Java SE: 8u361, 8u361-perf, 11.0.18, 17.0.6, 20; Oracle GraalVM Enterprise Edition: 20.3.9, 21.3.5, 22.3.1 8.0.361.0 · 11.0.18.0 · 17.0.6.0 · 20.0.0.0 · 20.3.9.0 · 21.3.5.0 · 22.3.1.0

Products and versions

10 products, 91 version entries
SourceVendorProductSchemeAffected versions
nvd debian debian linux generic 10.0 · 11.0 · 12.0
nvd netapp 7-mode transition tool generic any version
nvd netapp brocade san navigator generic any version
nvd netapp cloud insights acquisition unit generic any version
nvd netapp cloud insights storage workload security agent generic any version
nvd netapp oncommand insight generic any version
nvd oracle graalvm javase 20.3.9 · 21.3.5 · 22.3.1
nvd oracle jdk javase 1.8.0:update361 · 11.0.18 · 17.0.6 · 20
nvd oracle jre javase 1.8.0:update361 · 11.0.18 · 17.0.6 · 20
nvd oracle openjdk javase 8 · < 8.0.0.0 · 8:milestone1 · 8:milestone2 · 8:milestone3 · 8:milestone4 · 8:milestone5 · 8:update5 · 8:milestone6 · 8:milestone7 · 8:milestone8 · 8:milestone9 · 8:update11 · 8:update20 · 8:update25 · 8:update31 · 8:update40 · 8:update45 · 8:update51 · 8:update60 · 8:update65 · 8:update66 · 8:update71 · 8:update72 · 8:update73 · 8:update74 · 8:update77 · 8:update91 · 8:update92 · 8:update101 · 8:update102 · 8:update111 · 8:update112 · 8:update121 · 8:update131 · 8:update141 · 8:update151 · 8:update152 · 8:update161 · 8:update162 · 8:update171 · 8:update172 · 8:update181 · 8:update191 · 8:update192 · 8:update201 · 8:update202 · 8:update211 · 8:update212 · 8:update221 · 8:update222 · 8:update231 · 8:update232 · 8:update241 · 8:update242 · 8:update252 · 8:update262 · 8:update271 · 8:update281 · 8:update282 · 8:update291 · 8:update301 · 8:update302 · 8:update312 · 8:update322 · 8:update332 · 8:update342 · 8:update352 · 8:update362 · ≥ 11.0.0.0 and ≤ 11.0.18.0 · ≥ 17.0.0.0 and ≤ 17.0.6.0 · 20

References

URLTags
https://access.redhat.com/errata/RHSA-2023:1875 ADVISORY, RHSA-2023:1875
https://access.redhat.com/security/cve/CVE-2023-21939 REPORT, RHSA-2023:1875
https://access.redhat.com/errata/RHSA-2023:1877 ADVISORY, RHSA-2023:1877
https://access.redhat.com/errata/RHSA-2023:1878 ADVISORY, RHSA-2023:1878
https://access.redhat.com/errata/RHSA-2023:1879 ADVISORY, RHSA-2023:1879
https://access.redhat.com/errata/RHSA-2023:1880 ADVISORY, RHSA-2023:1880
https://access.redhat.com/errata/RHSA-2023:1889 ADVISORY, RHSA-2023:1889
https://access.redhat.com/errata/RHSA-2023:1890 ADVISORY, RHSA-2023:1890
https://access.redhat.com/errata/RHSA-2023:1891 ADVISORY, RHSA-2023:1891
https://access.redhat.com/errata/RHSA-2023:1892 ADVISORY, RHSA-2023:1892

Timeline

Published2023-04-18By the CVE Program.
ARMR remediation created2023-05-09Earliest commit adding this CVE's ARMR patch or security rule.
ARMR remediation last updated2026-03-04Most recent commit touching this CVE's ARMR patch or security rule.
Last VRT activity2026-03-04Most recent commit touching this CVE's classification, patch or rule file.
NVD record modified2026-06-17NVD's own last-modified date for this record.