CVE-2026-20212: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-6g5h-4mv8-prv7
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CVSS 9.8
CWE-1327
Published
Advisory Summary

CVE-2026-20212 is a CRITICAL (CVSS 9.8) security vulnerability vulnerability (CWE-1327: Binding to an Unrestricted IP Address) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product assigns the address 0.0.0.0 for a database server, a cloud service/instance, or any computing resource that communicates remotely.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-20212 at a Glance

CVE Identifier CVE-2026-20212
GHSA Identifier GHSA-6g5h-4mv8-prv7
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-1327: Binding to an Unrestricted IP Address
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 9.8

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

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

How to Fix CVE-2026-20212

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-2026-20212, 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-1327: Binding to an Unrestricted IP Address, where the product assigns the address 0.0.0.0 for a database server, a cloud service/instance, or any computing resource that communicates remotely. 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 vulnerability in the Silicon One integration for Cisco Nexus 9000 Series Switches could allow an unauthenticated, remote attacker to execute code with root privileges. This vulnerability exists because TCP ports 43210 and 43211 are accessible in the default Layer 3 (L3) virtual routing and forwarding (VRF). A successful exploit could allow the attacker to connect to an affected device and send crafted input that could be executed as code with root privileges. The exploitation of this vulnerability could also cause the S1HAL process to crash, which could cause the device to reload.

References

NVD — CVE-2026-20212 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-20212
Software Security Information SECURITY
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-n9k-s1-rce-EH8dEtr

Frequently Asked Questions

What is CVE-2026-20212?
CVE-2026-20212 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-1327: Binding to an Unrestricted IP Address.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-20212?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-20212?
CVE-2026-20212 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-20212?
CVE-2026-20212 is classified under CWE-1327: Binding to an Unrestricted IP Address (The product assigns the address 0.0.0.0 for a database server, a cloud service/instance, or any computing resource that communicates remotely.).
How can I check Maven dependencies for CVE-2026-20212?
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-6g5h-4mv8-prv7",
  "modified" : "2026-09-02T18:32:25Z",
  "published" : "2026-09-02T18:32:25Z",
  "aliases" : [ "CVE-2026-20212" ],
  "details" : "A vulnerability in the Silicon One integration for Cisco Nexus 9000 Series Switches could allow an unauthenticated, remote attacker to execute code with root privileges.\n\nThis vulnerability exists because TCP ports 43210 and 43211 are accessible in the default Layer 3 (L3) virtual routing and forwarding (VRF). A successful exploit could allow the attacker to connect to an affected device and send crafted input that could be executed as code with root privileges. The exploitation of this vulnerability could also cause the S1HAL process to crash, which could cause the device to reload.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-20212"
  }, {
    "type" : "WEB",
    "url" : "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-n9k-s1-rce-EH8dEtr"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1327" ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-02T17:17:31Z"
  }
}