# CVE-2025-30356

## Summary

- **CVE ID:** CVE-2025-30356
- **Severity:** CRITICAL
- **CVSS Score:** 9.3 (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)
- **CWE:** CWE-191, CWE-787
- **Published:** Apr 1, 2025
- **Last Modified:** Mar 12, 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 1.3.3 and earlier, a heap buffer overflow vulnerability persists in the Crypto_TC_ApplySecurity function due to an incomplete validation check on the fl (frame length) field. Although CVE-2025-29912 addressed an underflow issue involving fl, the patch fails to fully prevent unsafe calculations. As a result, an attacker can still craft malicious frames that cause a negative tf_payload_len, which is then interpreted as a large unsigned value, leading to a heap buffer overflow in a memcpy call.

## Affected Products

- nasa — CryptoLib (<= 1.3.3)

## References

- [CNA](https://github.com/nasa/CryptoLib/security/advisories/GHSA-6w2x-w7w3-85w2)
- [CNA](https://github.com/nasa/CryptoLib/commit/59d1bce7608c94c6131ef4877535075b0649799c)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.65%
- **EPSS Percentile:** 48.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._