EUVD-2026-52510
GHSA-q2fh-273g-4qm9
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Network-reachable CFDP endpoint requires no authentication to receive PDUs; impact is availability-only with no confidentiality or integrity loss.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
3DescriptionCVE.org
An issue in the CFDP receive path of NASA cFS v7.0.1 allows attackers to cause a Denial of Service (DoS) via replaying final CFDP PDUs.
AnalysisAI
Denial of service in NASA Core Flight System (cFS) v7.0.1 results from insufficient replay protection in the CFDP (CCSDS File Delivery Protocol) receive path, enabling unauthenticated network attackers to crash or disrupt the flight software stack by sending replayed final CFDP PDUs. SSVC classifies this as automatable with a proof-of-concept available, though the EPSS score of 0.14% (4th percentile) reflects the narrow operational footprint of aerospace flight software. No CISA KEV listing confirms active exploitation at time of analysis.
Technical ContextAI
NASA Core Flight System (cFS) is an open-source reusable flight software framework developed by NASA Goddard Space Flight Center, deployed in spacecraft, satellites, and ground control systems. CFDP (CCSDS File Delivery Protocol) is a standardized space data link protocol for reliable file transfers between ground and space segments, operating over UDP or TCP. The vulnerability resides in the CFDP receive path of cFS v7.0.1, where the implementation fails to properly validate or reject replayed 'final' PDUs - specifically end-of-file or closure PDUs that mark transaction completion. CWE-400 (Uncontrolled Resource Consumption) describes the root cause: repeated processing of replayed final PDUs likely triggers redundant state machine transitions, memory allocations, or processing loops that exhaust system resources. The CPE entry (cpe:2.3:a:n/a:n/a:*:*:*:*:*:*:*:*) provided by NVD is non-descriptive; the affected product is confirmed as cFS v7.0.1 directly from the CVE description and the GitHub issue at https://github.com/nasa/cFS/issues/1075.
RemediationAI
No vendor-released patched version is identified in the available data; the GitHub issue at https://github.com/nasa/cFS/issues/1075 should be monitored for an upstream fix, commit, or tagged release. Until a patch is available, operators should restrict network access to CFDP-facing interfaces using firewall rules or network segmentation, ensuring only trusted ground stations with known IP addresses can transmit CFDP PDUs to cFS instances - this directly reduces attack surface given AV:N exploitation requires network reachability. Mission teams should additionally consider implementing PDU sequence number or transaction-ID replay validation at the application layer as a compensating control, though this requires cFS application-level modifications and testing against mission-specific configurations. Air-gapped deployments are inherently less exposed but should still apply the upstream patch once released to eliminate residual insider or insider-adjacent threat vectors.
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Same weakness CWE-400 – Uncontrolled Resource Consumption
View allSame technique Denial Of Service
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External POC / Exploit Code
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