CVE-2026-76733Network attack vector

Administrative API service interruption

Published Sep 29, 2026 · Updated Sep 29, 2026

Denial of service in HPE Networking Instant On 3.4.1.0 and earlier allows remote authenticated users to interrupt its API service. HPE identifies the API endpoint as the locus but does not disclose which request or input-handling operation triggers the interruption. Administrative privileges are required, and the affected service resumes without manual intervention; data access or modification is not reported.

CVSS severity4.9
Medium
EPSS probability0.31%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Get started

Summary

What happened

Denial of service in HPE Networking Instant On 3.4.1.0 and earlier allows remote authenticated users to interrupt its API service. HPE identifies the API endpoint as the locus but does not disclose which request or input-handling operation triggers the interruption. Administrative privileges are required, and the affected service resumes without manual intervention; data access or modification is not reported.

The record

CVE
CVE-2026-76733
Published
Sep 29, 2026
Updated
Sep 29, 2026
Vendor
Hewlett Packard Enterprise (HPE)
Product
HPE Networking Instant On
Classifications
T1499.004
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Sep 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.0.0.0 <=3.4.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Hewlett Packard Enterprise (HPE) · HPE Networking Instant Onversion=0.0.0.0 <=3.4.1.0

Published CVSS scores

4.9Hewlett Packard Enterprise (HPE)CVSS:3.1/AV:N/AC:L/PR:H/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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Get started to see how Hinoki identifies affected software and validates exploitability in your environment.

Get started