CVE-2025-2026Network attack vector

Authenticated device reboot via null byte injection

Published Dec 31, 2025 · Updated Dec 31, 2025

Null byte injection in the web API of Moxa NPort 6100-G2/6200-G2 Series 1.0.0 allows remote authenticated users to reboot devices. The web API processes attacker-supplied null bytes without proper string termination, causing an unexpected device reboot. Web read-only privileges are sufficient, and successful exploitation interrupts service only until the appliance completes its reboot.

CVSS severity7.1
High
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Null byte injection in the web API of Moxa NPort 6100-G2/6200-G2 Series 1.0.0 allows remote authenticated users to reboot devices. The web API processes attacker-supplied null bytes without proper string termination, causing an unexpected device reboot. Web read-only privileges are sufficient, and successful exploitation interrupts service only until the appliance completes its reboot.

The record

CVE
CVE-2025-2026
Published
Dec 31, 2025
Updated
Dec 31, 2025
Vendor
Moxa
Product
NPort 6100-G2/6200-G2 Series
Classifications
CWE-170, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 31, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 31, 2025Record 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=1.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Moxa · NPort 6100-G2/6200-G2 Seriesversion=1.0.0

Published CVSS scores

7.1MoxaCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-170Improper Null Termination
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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