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9.8

Ghostlander Halcyon Critical Data Access Risk

CVE-2021-4300 · published 3 years ago
Summary

A critical vulnerability in Ghostlander Halcyon's Block Verification component allows attackers to access data remotely. This could lead to unauthorized access to sensitive information. To fix this, upgrade to version 1.1.1.0-hal.

What to do
  • Update halcyon_project halcyon to version 1.1.1.0 or later.
Affected software
VendorProductAffected versions
halcyon_project halcyon < 1.1.1.0
cpe:2.3:a:halcyon_project:halcyon:*:*:*:*:*:*:*:*
Original advisory text
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 Bl...
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.
References
Fix within
Internet-facing 3 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically (estimated)
  • Gives an attacker full control (estimated)
Severity
9.8 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-284Improper Access Control
Timeline
Published4 Jan 2023
Updated4 Nov 2026
First seen11 Apr 2026
Sources
CVE-2021-4300 · OSV
CVE-2021-4300 · NVD
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