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Vulnerability record · public intelligence
CVE-2021-4300
MEDIUM

ghostlander Halcyon Block Verification main.cpp AddToBlockIndex access control

Published Jan 4, 2023 · Updated Oct 23, 2026

Severity · CVSSMEDIUM · 6.3
Known exploitationNot listed
EPSS / likelihood0.69%
QFinch risk scoreNot available

Original summary

Normalized public record · Updated Oct 23, 2026

ghostlander Halcyon Block Verification main.cpp AddToBlockIndex access control

Publisher and source text is retained separately from QFinch interpretation.

QFinch assessment

A vulnerability has been found in ghostlander Halcyon and classified as critical. Affected by this vulnerability is the function CBlock::AddToBlockIndex of the file src/main.cpp of the component Block Verification. The manipulation leads to improper access controls. The attack can be launched remotely. Upgrading to version 1.1.1.0-hal is able to address this issue. The identifier of the patch is 0675b25ae9cc10b5fdc8ea3a32c642979762d45e. It is recommended to upgrade the affected component. The identifier VDB-217417 was assigned to this vulnerability.

Evidence: public source records

Affected products

Affected scope reported by the available public evidence
Affected package, product or rangeFix status
Consult the referenced vendor advisory for affected versions.Consult source advisory

Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.

Remediation

Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.

  1. Confirm the affected product and reachable code path exist in your environment.
  2. Apply the vendor-supported patch or mitigation from the primary advisory.
  3. Rescan the exact deployed revision and retain verification evidence.
Review primary references

Evidence coverage

CVENVDEPSS
SSVC priority
LOW
Confidence
Not available
Aliases
None reported

Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.

Sources and record history

  1. vuldb.com ↗
  2. vuldb.com ↗
  3. Patch commit ↗
  4. Source repository ↗

Record history

Published Jan 4, 2023 · Last refreshed Oct 23, 2026