CVE-2026-3356 Missing Authentication for Critical Function vulnerability in Anritsu Remote Spectrum Monitor
Unauthorized users can access and manipulate the management interface of Anritsu Remote Spectrum Monitors due to a lack of authentication mechanisms.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-3356?
CVE-2026-3356 is a critical missing authorization vulnerability in Anritsu Remote Spectrum Monitor MS27100A, published on 31 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-306
Which versions are affected by CVE-2026-3356?
How do I fix CVE-2026-3356?
No fix has been published for CVE-2026-3356 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-3356 being exploited?
There is no known exploitation of CVE-2026-3356 in the wild and no public exploit code.
Sources
Also known as GHSA-9c77-73hr-45rf.