Vulnerability · Published Oct 30, 2025 · Assigned by GitHub_M

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

High 8.8

In plain English

A high-severity stack buffer overflow in CryptoLib from nasa. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities).

Severity (CVSS 3.0)8.8High

Exploit odds (30 days)0.5%top 55.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
nasa	CryptoLib	< 1.4.2

Weakness: CWE-121 · Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

https://github.com/nasa/CryptoLib/security/advisories/GHSA-w6c3-pxvr-6m6j x_refsource_CONFIRM