CVE-2026-3356Network attack vector

Unauthenticated management control via absent authentication

Published Mar 31, 2026 · Updated Mar 31, 2026

Authentication bypass in all Anritsu Remote Spectrum Monitor versions allows remote attackers to control the management interface. The embedded web server exposes viewing, measurement, and configuration functions without any mechanism to enable or configure authentication. Network access alone permits reading sensitive signal data, altering operational settings, or interrupting device availability.

CVSS severity9.3
Critical
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in all Anritsu Remote Spectrum Monitor versions allows remote attackers to control the management interface. The embedded web server exposes viewing, measurement, and configuration functions without any mechanism to enable or configure authentication. Network access alone permits reading sensitive signal data, altering operational settings, or interrupting device availability.

The record

CVE
CVE-2026-3356
Published
Mar 31, 2026
Updated
Mar 31, 2026
Vendor
Anritsu
Product
Spectrum Monitor Module MS27100A
Classifications
CWE-306, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 31, 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=All versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Anritsu · Spectrum Monitor Module MS27100Aversion=All versions
Anritsu · Remote Spectrum Monitor MS27101Aversion=All versions
Anritsu · Remote Spectrum Monitor MS27103Aversion=All versions
Anritsu · Remote Spectrum Monitor MS27102Aversion=All versions

Published CVSS scores

9.3ICS-CERTCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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
T1190Exploit Public-Facing Application

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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