CVE-2025-30356

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.

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CVSS v3.1 Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-191 CWE-191

CWE-787 Out-of-bounds Write

Affected Products

Vendor	Product	Versions
nasa	cryptolib	< 1.4.0

References

Advisories & Patches

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

Exploits

https://github.com/nasa/CryptoLib/security/advisories/GHSA-6w2x-w7w3-85w2 https://github.com/nasa/CryptoLib/security/advisories/GHSA-6w2x-w7w3-85w2

Frequently Asked Questions

What is CVE-2025-30356? +

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. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2025-30356? +

CVE-2025-30356 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2025-30356? +

CVE-2025-30356 affects products from nasa, specifically: cryptolib. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-30356? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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