CVE-2026-67973Public exploitNetwork attack vector

Service interruption via replayed final CFDP PDUs

Published Aug 3, 2026 · Updated Aug 3, 2026

Resource exhaustion in the CFDP receive path of NASA cFS 7.0.1 allows remote attackers to interrupt service by replaying final PDUs. CF_CFDP_FinishTransaction leaves a completed receive transaction in HOLD and discoverable by CF_FindTransactionBySequenceNumber, while CF_CFDP_RecvHold re-arms its timer when a matching EOF or FIN PDU arrives. Exploitation requires CF to be enabled and access to its PDU ingress; repeated identifiers retain limited transaction slots and reduce channel capacity.

CVSS severity7.5
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in the CFDP receive path of NASA cFS 7.0.1 allows remote attackers to interrupt service by replaying final PDUs. CF_CFDP_FinishTransaction leaves a completed receive transaction in HOLD and discoverable by CF_FindTransactionBySequenceNumber, while CF_CFDP_RecvHold re-arms its timer when a matching EOF or FIN PDU arrives. Exploitation requires CF to be enabled and access to its PDU ingress; repeated identifiers retain limited transaction slots and reduce channel capacity.

The record

CVE
CVE-2026-67973
Published
Aug 3, 2026
Updated
Aug 3, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-400, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.003Application Exhaustion Flood

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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