NASA CryptoLib up to 1.4.1 CCSDS Space Data Link Security Protocol crypto_key_mgmt.c Crypto_Key_update length stack-based overflow

Summaryinfo

A vulnerability, which was classified as critical, was found in NASA CryptoLib up to 1.4.1. The impacted element is the function Crypto_Key_update of the file crypto_key_mgmt.c of the component CCSDS Space Data Link Security Protocol Handler. The manipulation of the argument length results in stack-based overflow. This vulnerability is reported as CVE-2025-64096. The attack can be launched remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in NASA CryptoLib up to 1.4.1. It has been classified as critical. Affected is the function Crypto_Key_update of the file crypto_key_mgmt.c of the component CCSDS Space Data Link Security Protocol Handler. The manipulation of the argument length with an unknown input leads to a stack-based overflow vulnerability. CWE is classifying the issue as CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2025-64096 since 10/27/2025. The exploitability is told to be easy. It is possible to launch the attack remotely. There are known technical details, but no exploit is available.

Upgrading to version 1.4.2 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• NASA

Name

• CryptoLib

Version

• 1.4.0
• 1.4.1

Website

• Product: https://github.com/nasa/CryptoLib/

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