CVE-2021-22727: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-cv48-2frc-94w5
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CWE-331
Published
Advisory Summary

CVE-2021-22727 is a CRITICAL security vulnerability vulnerability (CWE-331: Insufficient Entropy) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product uses an algorithm or scheme that produces insufficient entropy, leaving patterns or clusters of values that are more likely to occur than others.. Remediation is available in the latest vendor maintenance releases.

CVE-2021-22727 at a Glance

CVE Identifier CVE-2021-22727
GHSA Identifier GHSA-cv48-2frc-94w5
Severity CRITICAL
CVSS v3.1 Base Score N/A
CWE Classification CWE-331: Insufficient Entropy
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2021-22727

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-2021-22727, 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-331: Insufficient Entropy, where the product uses an algorithm or scheme that produces insufficient entropy, leaving patterns or clusters of values that are more likely to occur than others. 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

A CWE-331: Insufficient Entropy vulnerability exists in EVlink City (EVC1S22P4 / EVC1S7P4 all versions prior to R8 V3.4.0.1), EVlink Parking (EVW2 / EVF2 / EV.2 all versions prior to R8 V3.4.0.1), and EVlink Smart Wallbox (EVB1A all versions prior to R8 V3.4.0.1 ) that could allow an attacker to gain unauthorized access to the charging station web server

References

NVD — CVE-2021-22727 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-22727
download.schneider-electric.com/files WEB
http://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-194-06

Frequently Asked Questions

What is CVE-2021-22727?
CVE-2021-22727 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-331: Insufficient Entropy.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2021-22727?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2021-22727?
CVE-2021-22727 is classified under CWE-331: Insufficient Entropy (The product uses an algorithm or scheme that produces insufficient entropy, leaving patterns or clusters of values that are more likely to occur than others.).
How can I check Maven dependencies for CVE-2021-22727?
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-cv48-2frc-94w5",
  "modified" : "2022-05-24T19:08:48Z",
  "published" : "2022-05-24T19:08:48Z",
  "aliases" : [ "CVE-2021-22727" ],
  "details" : "A CWE-331: Insufficient Entropy vulnerability exists in EVlink City (EVC1S22P4 / EVC1S7P4 all versions prior to R8 V3.4.0.1), EVlink Parking (EVW2 / EVF2 / EV.2 all versions prior to R8 V3.4.0.1), and EVlink Smart Wallbox (EVB1A all versions prior to R8 V3.4.0.1 ) that could allow an attacker to gain unauthorized access to the charging station web server",
  "severity" : [ ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-22727"
  }, {
    "type" : "WEB",
    "url" : "http://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-194-06"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-331" ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2021-07-21T15:15:00Z"
  }
}