CVE-2025-27466: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-wx7g-7g56-c87j
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CVSS 9.8
CWE-395
Published
Advisory Summary

CVE-2025-27466 is a CRITICAL (CVSS 9.8) security vulnerability vulnerability (CWE-395: Use of NullPointerException Catch to Detect NULL Pointer Dereference) affecting Software libraries in the Maven ecosystem. The weakness occurs when catching nullpointerexception should not be used as an alternative to programmatic checks to prevent dereferencing a null pointer.. Remediation is available in the latest vendor maintenance releases.

CVE-2025-27466 at a Glance

CVE Identifier CVE-2025-27466
GHSA Identifier GHSA-wx7g-7g56-c87j
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-395: Use of NullPointerException Catch to Detect NULL Pointer Dereference
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-2025-27466

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-2025-27466, 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-395: Use of NullPointerException Catch to Detect NULL Pointer Dereference, where catching nullpointerexception should not be used as an alternative to programmatic checks to prevent dereferencing a null pointer. 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

[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] There are multiple issues related to the handling and accessing of guest memory pages in the viridian code: 1. A NULL pointer dereference in the updating of the reference TSC area. This is CVE-2025-27466. 2. A NULL pointer dereference by assuming the SIM page is mapped when a synthetic timer message has to be delivered. This is CVE-2025-58142. 3. A race in the mapping of the reference TSC page, where a guest can get Xen to free a page while still present in the guest physical to machine (p2m) page tables. This is CVE-2025-58143.

References

NVD — CVE-2025-27466 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-27466
xenbits.xenproject.org/xsa/advisory-472.ht... WEB
https://xenbits.xenproject.org/xsa/advisory-472.html
Software Security Information SECURITY
http://www.openwall.com/lists/oss-security/2025/09/09/1
xenbits.xen.org/xsa/advisory-472.ht... WEB
http://xenbits.xen.org/xsa/advisory-472.html

Frequently Asked Questions

What is CVE-2025-27466?
CVE-2025-27466 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-395: Use of NullPointerException Catch to Detect NULL Pointer Dereference.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2025-27466?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2025-27466?
CVE-2025-27466 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-2025-27466?
CVE-2025-27466 is classified under CWE-395: Use of NullPointerException Catch to Detect NULL Pointer Dereference (Catching NullPointerException should not be used as an alternative to programmatic checks to prevent dereferencing a null pointer.).
How can I check Maven dependencies for CVE-2025-27466?
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-wx7g-7g56-c87j",
  "modified" : "2025-11-05T00:31:26Z",
  "published" : "2025-09-11T15:31:17Z",
  "aliases" : [ "CVE-2025-27466" ],
  "details" : "[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\nThere are multiple issues related to the handling and accessing of guest\nmemory pages in the viridian code:\n\n 1. A NULL pointer dereference in the updating of the reference TSC area.\n    This is CVE-2025-27466.\n\n 2. A NULL pointer dereference by assuming the SIM page is mapped when\n    a synthetic timer message has to be delivered.  This is\n    CVE-2025-58142.\n\n 3. A race in the mapping of the reference TSC page, where a guest can\n    get Xen to free a page while still present in the guest physical to\n    machine (p2m) page tables.  This is CVE-2025-58143.",
  "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-2025-27466"
  }, {
    "type" : "WEB",
    "url" : "https://xenbits.xenproject.org/xsa/advisory-472.html"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2025/09/09/1"
  }, {
    "type" : "WEB",
    "url" : "http://xenbits.xen.org/xsa/advisory-472.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-395" ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2025-09-11T14:15:41Z"
  }
}