# CVE-2025-29912

## Summary

- **CVE ID:** CVE-2025-29912
- **Severity:** HIGH
- **CVSS Score:** 8.9 (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)
- **CWE:** CWE-122, CWE-191
- **Published:** Mar 17, 2025
- **Last Modified:** Mar 13, 2026

## 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.

## Affected Products

- nasa — CryptoLib (<= 1.3.3)

## References

- [CNA](https://github.com/nasa/CryptoLib/security/advisories/GHSA-3f5x-r59x-p8cf)
- [CNA](https://github.com/nasa/CryptoLib/commit/ca39cb96f21e76102aefb956d2c8c0ba0bd143ca)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 1.10%
- **EPSS Percentile:** 63.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._