CVE-2021-47339: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-3p2v-4qj8-6w5f
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CVSS 5.5
CWE-908
Published
Advisory Summary

CVE-2021-47339 is a MODERATE (CVSS 5.5) security vulnerability vulnerability (CWE-908: Use of Uninitialized Resource) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product uses or accesses a resource that has not been initialized.. Remediation is available in the latest vendor maintenance releases.

CVE-2021-47339 at a Glance

CVE Identifier CVE-2021-47339
GHSA Identifier GHSA-3p2v-4qj8-6w5f
Severity MODERATE
CVSS v3.1 Base Score 5.5
CWE Classification CWE-908: Use of Uninitialized Resource
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 5.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Local (AV:L)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2021-47339

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2021-47339, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-908: Use of Uninitialized Resource, where the product uses or accesses a resource that has not been initialized. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

In the Linux kernel, the following vulnerability has been resolved: media: v4l2-core: explicitly clear ioctl input data As seen from a recent syzbot bug report, mistakes in the compat ioctl implementation can lead to uninitialized kernel stack data getting used as input for driver ioctl handlers. The reported bug is now fixed, but it's possible that other related bugs are still present or get added in the future. As the drivers need to check user input already, the possible impact is fairly low, but it might still cause an information leak. To be on the safe side, always clear the entire ioctl buffer before calling the conversion handler functions that are meant to initialize them.

References

NVD — CVE-2021-47339 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-47339
git.kernel.org/stable/c/7b53cca764... WEB
https://git.kernel.org/stable/c/7b53cca764f9b291b7907fcd39d9e66ad728ee0b
git.kernel.org/stable/c/bfb48b54db... WEB
https://git.kernel.org/stable/c/bfb48b54db25c3b4ef4bef5e0691464ebc4aa335
git.kernel.org/stable/c/dc02c0b2bd... WEB
https://git.kernel.org/stable/c/dc02c0b2bd6096f2f3ce63e1fc317aeda05f74d8

Frequently Asked Questions

What is CVE-2021-47339?
CVE-2021-47339 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-908: Use of Uninitialized Resource.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2021-47339?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2021-47339?
CVE-2021-47339 has a CVSS v3.1 base score of 5.5 (MODERATE) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2021-47339?
CVE-2021-47339 is classified under CWE-908: Use of Uninitialized Resource (The product uses or accesses a resource that has not been initialized.).
How can I check Maven dependencies for CVE-2021-47339?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-3p2v-4qj8-6w5f",
  "modified" : "2025-03-06T15:34:35Z",
  "published" : "2024-05-21T15:31:43Z",
  "aliases" : [ "CVE-2021-47339" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: v4l2-core: explicitly clear ioctl input data\n\nAs seen from a recent syzbot bug report, mistakes in the compat ioctl\nimplementation can lead to uninitialized kernel stack data getting used\nas input for driver ioctl handlers.\n\nThe reported bug is now fixed, but it's possible that other related\nbugs are still present or get added in the future. As the drivers need\nto check user input already, the possible impact is fairly low, but it\nmight still cause an information leak.\n\nTo be on the safe side, always clear the entire ioctl buffer before\ncalling the conversion handler functions that are meant to initialize\nthem.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-47339"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/7b53cca764f9b291b7907fcd39d9e66ad728ee0b"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/bfb48b54db25c3b4ef4bef5e0691464ebc4aa335"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/dc02c0b2bd6096f2f3ce63e1fc317aeda05f74d8"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-908" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2024-05-21T15:15:20Z"
  }
}