CVE-2026-10831 Improper Authorization of Break Signal Commands in Devices
Remote attackers can disrupt serial communication by sending unauthorized break signal commands due to missing session validation in Moxa NPort devices.
- 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-2026-10831?
CVE-2026-10831 is a medium-severity missing authorization vulnerability in Moxa CN2600 Series, published on 16 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A denial-of-service vulnerability exists in NPort devices because of improper access control on the command port. The command interface does not properly validate whether a sender is associated with a valid data port session before accepting break signal commands. A remote attacker with network access can send crafted requests to disrupt serial communication for an active user session.
Weakness: CWE-862
Which versions are affected by CVE-2026-10831?
How do I fix CVE-2026-10831?
No fix has been published for CVE-2026-10831 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-2026-10831 being exploited?
There is no known exploitation of CVE-2026-10831 in the wild and no public exploit code.
Sources
Also known as GHSA-fxj4-v3m4-37hj.