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CVE Vulnerability Database
Vulnerability Database/CVE-2026-21645

CVE-2026-21645: Rejected CVE Entry Information

CVE-2026-21645 is a rejected CVE identifier that was reserved but never used for an actual vulnerability. This article explains what rejected CVE entries mean, why CVE identifiers get withdrawn, and their significance.

Updated: January 22, 2026

CVE-2026-21645 Overview

CVE-2026-21645 is a CVE entry that has been rejected by the CVE Numbering Authority (CNA). The rejection reason provided is "Not used," indicating that this CVE identifier was reserved but ultimately not assigned to any vulnerability.

Critical Impact

This CVE has been rejected and does not represent an active security vulnerability. No action is required.

Affected Products

  • No affected products - CVE rejected

Discovery Timeline

  • 2026-01-03 - CVE-2026-21645 published to NVD (as rejected)
  • 2026-01-03 - Last updated in NVD database

Technical Details for CVE-2026-21645

Vulnerability Analysis

This CVE entry has been formally rejected by the issuing CVE Numbering Authority. Rejected CVEs typically occur when a CVE ID is reserved for a potential vulnerability that is later determined to be invalid, a duplicate of an existing CVE, or when the reserved ID is simply not used before expiration.

The rejection status means there is no underlying vulnerability associated with this identifier. Organizations should not take any remediation actions based on this CVE entry.

Root Cause

Not applicable - this CVE has been rejected and does not describe an actual vulnerability.

Attack Vector

Not applicable - no vulnerability exists under this CVE identifier.

Detection Methods for CVE-2026-21645

Indicators of Compromise

  • No IOCs exist for this rejected CVE entry
  • Any alerts referencing this CVE should be considered false positives

Detection Strategies

  • Update vulnerability scanning tools to recognize this CVE as rejected
  • Exclude CVE-2026-21645 from active vulnerability tracking dashboards
  • Verify that security tools properly handle rejected CVE status

Monitoring Recommendations

  • No active monitoring is required for this rejected CVE
  • Review vulnerability management processes to ensure rejected CVEs are properly filtered

How to Mitigate CVE-2026-21645

Immediate Actions Required

  • No immediate action is required as this CVE has been rejected
  • Remove any alerts or tickets associated with this CVE from remediation queues
  • Update vulnerability databases to reflect the rejected status

Patch Information

No patches are required or available as this CVE does not represent an actual security vulnerability. The CVE was rejected with the reason "Not used."

Workarounds

  • No workarounds are necessary for rejected CVE entries
  • Organizations can safely ignore this CVE in their vulnerability management programs
  • Consider reviewing CVE feeds to ensure rejected entries are properly filtered from reports

Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.

  • Vulnerability Details
  • TypeOther
  • Vendor/TechN/A
  • SeverityNONE
  • CVSS ScoreN/A
  • Known ExploitedNo
  • Impact Assessment
  • ConfidentialityNone
  • IntegrityNone
  • AvailabilityNone
  • Latest CVEs
  • CVE-2025-9185: Mozilla Firefox RCE Vulnerability
  • CVE-2025-9184: Mozilla Firefox RCE Vulnerability
  • CVE-2025-9180: Mozilla Firefox Auth Bypass Vulnerability
  • CVE-2025-8030: Mozilla Firefox RCE Vulnerability
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