{"id":"CVE-2021-4300","details":"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.","modified":"2026-04-11T18:45:41.231156Z","published":"2023-01-04T22:15:08.903Z","references":[{"type":"ADVISORY","url":"https://github.com/ghostlander/Halcyon/releases/tag/v1.1.1.0-hal"},{"type":"REPORT","url":"https://vuldb.com/?id.217417"},{"type":"REPORT","url":"https://vuldb.com/?ctiid.217417"},{"type":"FIX","url":"https://github.com/ghostlander/Halcyon/commit/0675b25ae9cc10b5fdc8ea3a32c642979762d45e"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/ghostlander/halcyon","events":[{"introduced":"0"},{"fixed":"ed39a503c84d9608d0f301f12ae128f36c4faf38"},{"fixed":"0675b25ae9cc10b5fdc8ea3a32c642979762d45e"}],"database_specific":{"versions":[{"introduced":"0"},{"fixed":"1.1.1.0"}]}}],"versions":["v1.1.0.0-hal","v1.1.0.1-hal","v1.1.0.2-hal","v1.1.0.3-hal"],"database_specific":{"vanir_signatures_modified":"2026-04-11T18:45:41Z","source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-4300.json","vanir_signatures":[{"id":"CVE-2021-4300-c1935fa3","signature_version":"v1","deprecated":false,"source":"https://github.com/ghostlander/halcyon/commit/0675b25ae9cc10b5fdc8ea3a32c642979762d45e","signature_type":"Function","digest":{"length":2940,"function_hash":"10305248216024656084912338977232963110"},"target":{"file":"src/main.cpp","function":"CBlock::CheckBlock"}},{"id":"CVE-2021-4300-c40e6802","signature_version":"v1","deprecated":false,"source":"https://github.com/ghostlander/halcyon/commit/0675b25ae9cc10b5fdc8ea3a32c642979762d45e","signature_type":"Line","digest":{"line_hashes":["105355511900724386530181311696563767876","269402346052448994325041188111138389157","309460302393590256566086224470897904031","230116994094110080314317628614218126604","276826980275533762924066868480772846694","98543386248935302488754600721159916577","287758536505900560444298499842733742026","311147851611641751698846828549482860550","284908018889021951316895529834250969422","62401294572304355820185300454867920975","122535623190981126376093543514470620962","104241435607975237020381975562207888764","174882452581893492705787870648806259108","278182712261701462478699443981443333452","74795623710365316666848520038722447926","95810954626867192821845781116982777205","184047123222678067942587501639909895204","127599239359550807544091793257356758189","78523805818798612704265286547567952399","80379672143717063287650162974945346929","93772305838583647473965125620256691828","94059201929041676340436963391723831613","282274884842151607671657621220049004194","58310343209319890363302639893853656158","320444084641697696576935459030831457211","116215755057023781153784689046981206461","137352023725335996649038982297868078275","283876739839686851178925081232490303776","227835412256598348415626178544836038418","178674064702455874137163593537777265956","294594937731353267025049352776862019873","120241644017525521818705461085648474671"],"threshold":0.9},"target":{"file":"src/main.cpp"}}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}