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01 Record

CVE-2026-54777

CoreWCF NetNamedPipe transport accepts attach to a pre-existing named pipe instance

MediumPUBLISHEDCNA: GitHub_M
CNA base score6.5 CVSS v3.xCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L
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02 Description

CoreWCF NetNamedPipe transport accepts attach to a pre-existing named pipe instance

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.11% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 1.8% of scored records. A rank, not a probability.
NVD base score
6.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L
NVD analysis status
Deferred. NVD last modified this record on 2026-07-10.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-07-08 22:01Z3 MO AGO
Last updated
2026-07-10 03:55Z3 MO AGO
Reserved
2026-06-15
Assigning CNA
GitHub_M
Record state
PUBLISHED
Severity
Medium (CVSS 6.5)
CNA CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L
Weaknesses
  • CWE-367Time-of-check Time-of-use (TOCTOU) Race ConditionBase
  • CWE-665Improper InitializationClass
Data version
5.2
Document digest
361b6691b695beddf69b1b1f22c35b077e419061b069fb53898486afcaee7545

05 Affected products

VendorProductVersionsPlatforms
CoreWCFCoreWCF>= 1.9.0, < 1.9.1, < 1.8.1—

06 References