EUVD-2026-52511
GHSA-xmm3-v54h-w2cc
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Network-reachable unauthenticated command handler; I:H for subscription table manipulation; A:L added because removing subscriptions can disrupt telemetry data delivery.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
Incorrect access control in NASA cFS v7.0.1 allows attackers to arbitrarily remove low-index subscriptions and add new streams via sending TO_LAB add/remove subscription commands.
AnalysisAI
Incorrect access control in NASA Core Flight System (cFS) v7.0.1 permits unauthenticated remote attackers to manipulate the telemetry subscription table by sending arbitrary TO_LAB (Telemetry Output Lab) add and remove subscription commands. Low-index subscriptions can be silently removed and new data streams injected, threatening the integrity of telemetry routing on ground-connected flight software deployments. No public exploit has been identified at time of analysis, and the EPSS score of 0.14% (4th percentile) indicates very low observed exploitation activity, though the complete absence of authentication on a command interface is a structurally severe design flaw.
Technical ContextAI
NASA's Core Flight System (cFS) is an open-source, reusable spacecraft flight software framework built around the Core Flight Executive (cFE) message bus. The TO_LAB application is the Telemetry Output Lab component, designed primarily for ground testing rather than production flight use; it subscribes to software-bus message IDs and forwards telemetry packets over UDP to ground stations. The vulnerability (CWE-284, Improper Access Control) exists because TO_LAB exposes add-subscription and remove-subscription command handlers over the network without enforcing any authentication or authorization checks. Any network-reachable host can therefore send valid TO_LAB command packets to arbitrarily add or remove message-ID subscriptions, directly manipulating which telemetry streams are active. CPE data in NVD is recorded as 'n/a', making automated asset matching unreliable; affected version is confirmed by description as v7.0.1.
RemediationAI
No vendor-released patch with an exact fix version has been identified from available data at time of analysis. The GitHub issue https://github.com/nasa/cFS/issues/1076 should be monitored for upstream fix commits or tagged releases. Until a patch is released, the primary compensating control is network isolation: restrict access to the TO_LAB command port (typically UDP) to trusted ground station hosts using host-based or network firewall rules, which limits exploitation to those already on the trusted segment. Operators should also disable or remove the TO_LAB application entirely from any deployment that does not require live telemetry output in a lab environment, as the component is not required for flight builds. If TO_LAB must remain enabled, configure the cFE software bus to require command authentication where the platform supports it. Each control carries a trade-off: firewall rules depend on accurate network topology documentation, and disabling TO_LAB removes telemetry visibility for integration testing workflows. The NVD advisory is at https://nvd.nist.gov/vuln/detail/CVE-2026-67975.
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Same weakness CWE-284 – Improper Access Control
View allSame technique Authentication Bypass
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External POC / Exploit Code
Leaving vuln.today