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. In versions 1.3.3 and prior, an unsigned integer underflow in the `Crypto_TC_ProcessSecurity` function of CryptoLib leads to a heap buffer overflow. The vulnerability is triggered when the `fl` (frame length) field in a Telecommand (TC) packet is set to 0. This underflow causes the frame length to be interpreted as 65535, resulting in out-of-bounds memory access. This critical vulnerability can be exploited to cause a denial of service (DoS) or potentially achieve remote code execution. Users of CryptoLib are advised to apply the recommended patch or avoid processing untrusted TC packets until a fix is available.

Classification

CVE ID: CVE-2025-29912

CVSS Base Severity: HIGH

CVSS Base Score: 8.9

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P

Affected Products

Vendor: nasa

Product: CryptoLib

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.2% (probability of being exploited)

EPSS Percentile: 42.85% (scored less or equal to compared to others)

EPSS Date: 2025-04-15 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-29912
https://github.com/nasa/CryptoLib/security/advisories/GHSA-3f5x-r59x-p8cf
https://github.com/nasa/CryptoLib/commit/ca39cb96f21e76102aefb956d2c8c0ba0bd143ca

Timeline