Vulnerability

CVE-2026-42915

Medium· 5.7CVSS5.7EPSS0%

.rules3/5

Incorrect calculation of buffer size in Windows TCP/IP allows an authorized attacker to deny service over an adjacent network.

Threat signal

57/100

Elevated

Severity

medium

CVSS

5.7

EPSS

Active

CVSS

v3.1via NVDOpen in FIRST calculator →

5.7/ 10MEDIUMCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack VectorAdjacentRequires same broadcast / collision domain (LAN, Bluetooth, MPLS).
Attack ComplexityLowNo special conditions — exploit works reliably.
Privileges RequiredLowStandard user privileges sufficient.
User InteractionNoneFully automated — no victim action needed.
ScopeUnchangedImpact contained to the vulnerable component.
Confidentiality ImpactNoneNo confidentiality impact.
Integrity ImpactNoneNo integrity impact.
Availability ImpactHighTotal loss of availability — full DoS possible.

EPSS

Exploit prediction · 30-day horizonFIRST.org →

0.21%

probability of exploitation in next 30 days

p43

higher than 43% of all CVEs

3-day trend↑ 0pp

Low exploitation likelihood — defer if no other signals fire.

Vendor VEX

No VEX statements published for CVE-2026-42915. Vendors publish VEX (Vulnerability Exploitability eXchange) to assert per-product whether a CVE is actually exploitable in their distribution.

SSVCDefer

No exploitation, limited impact or prevalence

exploitation: none
automatable: no
impact: partial
mission: support

Lifecycle

2026-06-09Vendor advisory · microsoftCVE-2026-42915 — Windows TCP/IP Denial of Service Vulnerability
2026-06-09Published
2026-06-11Last modified1 source

Entity graph

2 nodes · 1 edges · click to pivot

CVEActorVendor advisoryIOCNews

Vendor advisories

microsoftCVE-2026-42915Windows TCP/IP Denial of Service Vulnerability

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42915

No source-event history recorded yet. New revisions will appear here as ingestors re-fetch this CVE.