CVE-2025-64096: CryptoLib vulnerable to Stack Buffer Overflow in Crypto_Key_Update due to missing TLV length check

Severity: high (CVSS 8.8 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2025-10-30 · updated 2026-06-17
Weakness: CWE-121

Description

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 1.4.2, there is a missing bounds check in Crypto_Key_update() (crypto_key_mgmt.c) which allows a remote attacker to trigger a stack-based buffer overflow by supplying a TLV packet with a spoofed length field. The function calculates the number of keys from an attacker-controlled field (pdu_len), which may exceed the static array size (kblk[98]), leading to an out-of-bounds write and potential memory corruption. This vulnerability is fixed in 1.4.2.

Affected products

nasa CryptoLib: before 1.4.2 — fixed in 1.4.2

How to fix

Upgrade to a fixed version: nasa CryptoLib 1.4.2. Check the vendor advisory for mitigations.

References

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