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Debian LinuxOperating system · Debian

CVE-2023-21967

MEDIUM · 5.9 CVSS v3.1 Published 2023-04-18
Fix available
A fix is available. Upgrade to 8 or later.
See remediation →
68/100
Remediation priority · Elevated
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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: 8u361, 8u361-perf, 11.0.18, 17.0.6, 20; Oracle GraalVM Enterprise Edition: 20.3.9, 21.3.5 and 22.3.1. Difficult to exploit vulnerability allows unauthenticated attacker with network access via HTTPS to compromise Oracle Java SE, Oracle GraalVM Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete 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 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 5.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H).

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

A denial-of-service vulnerability in Java's JSSE (Java Secure Socket Extension) component allows unauthenticated remote attackers to cause Java applications to hang or crash via specially crafted HTTPS requests. The vulnerability affects Oracle Java SE and GraalVM Enterprise Edition versions and is particularly relevant for deployments running sandboxed Java Web Start applications or applets that load untrusted code from the internet.

MitigationApply the relevant Oracle Critical Patch Update for the affected Java versions (8u361+, 11.0.18+, 17.0.6+, 20+, GraalVM 20.3.9+, 21.3.5+, 22.3.1+) to address this vulnerability.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Debian LinuxOperating system
Affected:= 10.0= 11.0= 12.0
OpenjdkApplication
Affected:< 8>= 11, <= 11.0.18>= 17, <= 17.0.6= 8= 20
GraalvmApplication
Affected:= 20.3.9= 21.3.5= 22.3.1
JdkApplication
Affected:= 1.8.0= 11.0.18= 17.0.6= 20
JreApplication
Affected:= 1.8.0= 11.0.18= 17.0.6= 20
7 Mode Transition ToolApplication
Affected:all versions
Brocade San NavigatorApplication
Affected:all versions
Cloud Insights Acquisition UnitApplication
Affected:all versions

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify installed Java version
    Run 'java -version' or 'java -fullversion' from command line to get the exact Java version string
    Affected if Version matches Debian 10.0, 11.0, or 12.0; Oracle OpenJDK/JDK/JRE 8, 11.0.18 or earlier, 17.0.6 or earlier, 20; or GraalVM 20.3.9, 21.3.5, 22.3.1
  2. Confirm JSSE is in use
    Verify Java applications use HTTPS connections (JSSE is the default TLS/SSL provider for Java; check application configs for javax.net.ssl properties or SSLContext usage)
    Affected if Java applications make outbound or accept inbound HTTPS connections using the default JSSE provider
  3. Check for Java Web Start or applet usage
    Inspect system for Java Web Start (javaws) or applet configurations; look for .jnlp files or browser plugin configurations
    Affected if Java Web Start applications or browser applets that load untrusted code from the network are enabled or in use
  4. Identify NetApp product installations
    For NetApp products, check installed version using product-specific commands or look for 7 Mode Transition Tool, Brocade San Navigator, or Cloud Insights Acquisition Unit in installed software
    Affected if Any version of the listed NetApp products is installed (all versions are affected)
  5. Verify patch level against fixed versions
    Compare installed Java build against known fixed versions: 8u361+, 11.0.18+, 17.0.6+, 20+, or GraalVM 20.3.9+, 21.3.5+, 22.3.1+
    Affected if Installed version is lower than the fixed versions listed

Your environment is affected if you run any of the listed Java versions and use JSSE for HTTPS connections, especially if Java Web Start or applets loading untrusted code are enabled, or if you have any version of the affected NetApp products installed.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 8 or later
Fixed in 8
Interim mitigation

Apply the relevant Oracle Critical Patch Update for the affected Java versions (8u361+, 11.0.18+, 17.0.6+, 20+, GraalVM 20.3.9+, 21.3.5+, 22.3.1+) to address this vulnerability.

Recommended fix High confidence

Oracle Java SE 8u371+/11.0.19+/17.0.7+/20.0.1+ or Oracle GraalVM Enterprise Edition 20.3.10/21.3.6/22.3.2; Debian OpenJDK packages from Debian security repositories

  1. 1. Identify the exact Java/JDK version currently installed by running 'java -version' or checking the package manager
  2. 2. For Oracle Java SE: upgrade to Oracle Java SE 8u371 or later, 11.0.19 or later, 17.0.7 or later, or 20.0.1 or later
  3. 3. For Oracle GraalVM Enterprise Edition: upgrade to 20.3.10, 21.3.6, or 22.3.2 respectively
  4. 4. For Debian systems using OpenJDK: update the package repository and upgrade the OpenJDK package to the latest available version in Debian security updates (11.0.19+, 17.0.7+)
  5. 5. Verify the fix by running 'java -version' to confirm the patched version is installed
  6. 6. Restart any running Java applications or services to ensure they use the updated Java runtime
Caveat Upgrading Java versions may cause compatibility issues with applications depending on specific Java version behaviors; test thoroughly before production deployment

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Debian Linux Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
18.0 hours of engineering $3,200
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2023-21967 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data