CVE-2025-30356

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.6%, top 54% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS
46.0%
KEV
Not listed

Published

April 1, 2025

Last Modified

April 29, 2025

Advisory Details (2)

Auto-updated Jun 25, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit.
github Patch Available🟡 PoC Available

Heap Buffer Overflow via Incomplete Length Check in `Crypto_TC_ApplySecurity` · Advisory · nasa/CryptoLib · GitHub

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

commit 59d1bce7608c (nasa/CryptoLib)

Patch available: nasa/CryptoLib v1.4.0 (contains commit 59d1bce7608c)

https://github.com/nasa/CryptoLib/commit/59d1bce7608c94c6131ef4877535075b0649799c

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 49× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-23 02:53 UTCEG score recompute
  2. 2026-07-22 14:07 UTCEPSS rescore
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  1. 2026-07-08 15:14 UTCEPSS rescore
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  3. 2026-07-07 05:51 UTCOSV refresh
  4. 2026-07-06 16:27 UTCEPSS rescore
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  35. 2026-06-18 17:05 UTCOSV refresh
  36. 2026-06-17 17:52 UTCEPSS rescore
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  44. 2026-06-11 13:59 UTCEPSS rescore
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  66. 2026-05-30 08:21 UTCEG score recompute
  67. 2026-05-29 13:44 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2025-30356?
CVE-2025-30356 is a critical vulnerability published on April 1, 2025. 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…
When was CVE-2025-30356 disclosed?
CVE-2025-30356 was first published in the National Vulnerability Database on April 1, 2025, with the most recent update on April 29, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-30356 actively exploited?
CVE-2025-30356 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 46.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-30356?
CVE-2025-30356 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2025-30356?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-30356, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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