CVE-2026-21897

CryptoLib provides a software-only solution using the CCSDS Space Data Link Security Protocol - Extended Procedures (SDLS-EP) to secure communications between a spacecraft running the core Flight System (cFS) and a ground station. Prior to version 1.4.3, the CryptoConfigAddGvcidManagedParameters function only checks whether gvcidcounter > GVCIDMANPARAMSIZE. As a result, it allows up to the 251st entry, which causes a write past the end of the array, overwriting gvcidcounter located immediately after gvcidmanagedparametersarray[250]. This leads to an out-of-bounds write, and the overwritten gvcidcounter may become an arbitrary value, potentially affecting the parameter lookup/registration logic that relies on it. This issue has been patched in version 1.4.3.