CVE-2021-4300 json
ghostlander Halcyon Block Verification main.cpp AddToBlockIndex access control
published 2023-01-04 3 y ago modified 2026-06-17 4 mo ago also EUVD-2021-34135
- cvss
- 6.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 53%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- halcyon_project halcyon 1.1.1.0
Exploit prediction
0.71% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L |
| CNA | 3.0 | 6.3 | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L |
| CNA | 2.0 | 6.5 | AV:N/AC:L/Au:S/C:P/I:P/A:P |
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
- ghostlander Halcyon
Classification
- Weakness
-
- CWE-284 Improper Access Control
References
-
github.com
/ghostlander/Halcyon/commit/0675b25ae9cc10b5fdc8ea3a32c642979762d45e
patch
-
github.com
/ghostlander/Halcyon/releases/tag/v1.1.1.0-hal
patch, release-notes
-
vuldb.com
/?id.217417
vdb-entry, technical-description, permissions-required, third-party-advisory
-
vuldb.com
/?ctiid.217417
signature, permissions-required, third-party-advisory
Sources
- CVE List CVE-2021-4300
- NVD CVE-2021-4300
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