CVE-2025-15620Network attack vector

Unauthenticated switch reboot via crafted HTTP GET

Published Apr 2, 2026 · Updated Apr 2, 2026

Denial of service in the Belden HiOS web interface 09.1.00 through 09.4.04 and 10.0.00 through 10.3.00 allows remote attackers to reboot switches. The web interface accepts a crafted HTTP GET request to an undisclosed endpoint and invokes an uncontrolled device reboot without authentication. Network access to the management interface is sufficient; the reported consequence is a switch reboot and resulting service interruption, not data access or modification.

CVSS severity9.2
Critical
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Belden HiOS web interface 09.1.00 through 09.4.04 and 10.0.00 through 10.3.00 allows remote attackers to reboot switches. The web interface accepts a crafted HTTP GET request to an undisclosed endpoint and invokes an uncontrolled device reboot without authentication. Network access to the management interface is sufficient; the reported consequence is a switch reboot and resulting service interruption, not data access or modification.

The record

CVE
CVE-2025-15620
Published
Apr 2, 2026
Updated
Apr 2, 2026
Vendor
Belden
Product
HiOS Switch Software
Classifications
CWE-306, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 2, 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?

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

  1. Affected versionversion=09.1.00 <=09.4.05
  2. Affected versionversion=10.0.00 <=10.3.01

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Belden · HiOS Switch Softwareversion=09.1.00 <=09.4.05; version=10.0.00 <=10.3.01

Published CVSS scores

8.6NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
9.2VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
8.6VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1499.004Endpoint Denial of Service: Application 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

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Your stack

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