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CVE-2026-21897

Estado: AnalizadaAlta (7.3)—

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 Crypto_Config_Add_Gvcid_Managed_Parameters function only checks whether gvcid_counter > GVCID_MAN_PARAM_SIZE. As a result, it allows up to the 251st entry, which causes a write past the end of the array, overwriting gvcid_counter located immediately after gvcid_managed_parameters_array[250].

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This leads to an out-of-bounds write, and the overwritten gvcid_counter 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.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Buffer overflow remoto (CWE-787, AV:N/AC:L/PR:N) en servidor cFS expuesto. Sobrescritura de memoria corrompe lógica de parámetros, habilitando ejecución de código o manipulación de datos del protocolo SDLS-EP.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Privileged Account ManagementNetwork SegmentationVulnerability ScanningRestrict Web-Based ContentRestrict File and Directory PermissionsRemote Data Storage

Tecnologías afectadas (1)

Nasa — Cryptolib

CWE

Referencias

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  "id": "CVE-2026-21897",
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          "options": [
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          "version": "2.0.3",
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
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      "value": "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 Crypto_Config_Add_Gvcid_Managed_Parameters function only checks whether gvcid_counter > GVCID_MAN_PARAM_SIZE. As a result, it allows up to the 251st entry, which causes a write past the end of the array, overwriting gvcid_counter located immediately after gvcid_managed_parameters_array[250]. This leads to an out-of-bounds write, and the overwritten gvcid_counter 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."
    },
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      "value": "CryptoLib proporciona una solución únicamente de software utilizando el Protocolo de Seguridad de Enlace de Datos Espaciales CCSDS - Procedimientos Extendidos (SDLS-EP) para asegurar las comunicaciones entre una nave espacial ejecutando el Sistema de Vuelo central (cFS) y una estación terrestre. Antes de la versión 1.4.3, la función Crypto_Config_Add_Gvcid_Managed_Parameters solo verifica si gvcid_counter &gt; GVCID_MAN_PARAM_SIZE. Como resultado, permite hasta la entrada 251, lo que provoca una escritura más allá del final del array, sobrescribiendo gvcid_counter ubicado inmediatamente después de gvcid_managed_parameters_array[250]. Esto conduce a una escritura fuera de límites, y el gvcid_counter sobrescrito puede convertirse en un valor arbitrario, afectando potencialmente la lógica de búsqueda/registro de parámetros que depende de él. Este problema ha sido parcheado en la versión 1.4.3."
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  "lastModified": "2026-06-17T10:19:06.680",
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