Vulnerability

CVE-2026-83862

High· 8.8CVSS8.8EPSS0%

.rules3/5

Use after free in Windows Network Load Balancing allows an unauthorized attacker to execute code over an adjacent network.

Threat signal

88/100

Severe

Severity

high

CVSS

8.8

EPSS

Active

CVSS

v3.1via NVDOpen in FIRST calculator →

8.8/ 10HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack VectorAdjacentRequires same broadcast / collision domain (LAN, Bluetooth, MPLS).
Attack ComplexityLowNo special conditions — exploit works reliably.
Privileges RequiredNoneUnauthenticated — no credentials needed.
User InteractionNoneFully automated — no victim action needed.
ScopeUnchangedImpact contained to the vulnerable component.
Confidentiality ImpactHighTotal disclosure of sensitive data.
Integrity ImpactHighTotal compromise of integrity — full data modification possible.
Availability ImpactHighTotal loss of availability — full DoS possible.

EPSS

Exploit prediction · 30-day horizonFIRST.org →

0.33%

probability of exploitation in next 30 days

p24

higher than 24% of all CVEs

Low exploitation likelihood — defer if no other signals fire.

Vendor VEX

No VEX statements published for CVE-2026-83862. Vendors publish VEX (Vulnerability Exploitability eXchange) to assert per-product whether a CVE is actually exploitable in their distribution.

SSVCTrack

Total impact on non-trivial mission systems

exploitation: none
automatable: yes
impact: total
mission: support

Lifecycle

2026-10-13Published
2026-10-23Vendor advisory · microsoftCVE-2026-83862 — Windows Network Load Balancing Remote Code Execution Vulnerability
2026-10-23Last modified1 source

Entity graph

2 nodes · 1 edges · click to pivot

CVEActorVendor advisoryIOCNews

Vendor advisories

microsoftCVE-2026-83862Windows Network Load Balancing Remote Code Execution Vulnerability

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83862