CVE-2026-16876Network attack vector

Unauthenticated CLI command execution via WebGUI message tampering

Published Sep 7, 2026 · Updated Sep 8, 2026

Authentication bypass in NEC UNIVERGE IX-R/IX-V 1.1 through 1.3, 1.4.21 through 1.4.28, and 1.5.23 allows remote attackers to run CLI commands. The WebGUI processes attacker-tampered messages without enforcing authentication, exposing its CLI execution function. The HTTP(S) server must be enabled and network-reachable; no credentials or user interaction are required, and successful exploitation grants device command execution.

CVSS severity9.3
Critical
EPSS probability0.33%
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 NEC UNIVERGE IX-R/IX-V 1.1 through 1.3, 1.4.21 through 1.4.28, and 1.5.23 allows remote attackers to run CLI commands. The WebGUI processes attacker-tampered messages without enforcing authentication, exposing its CLI execution function. The HTTP(S) server must be enabled and network-reachable; no credentials or user interaction are required, and successful exploitation grants device command execution.

The record

CVE
CVE-2026-16876
Published
Sep 7, 2026
Updated
Sep 8, 2026
Vendor
NEC Corporation
Product
UNIVERGE IX-R/IX-V
Classifications
CWE-306, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 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 from Ver1.1 through Ver1.3, All versions from Ver1.4.21 through Ver1.4.28 and Ver1.5.23

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

NEC Corporation · UNIVERGE IX-R/IX-Vversion=All versions from Ver1.1 through Ver1.3, All versions from Ver1.4.21 through Ver1.4.28 and Ver1.5.23

Published CVSS scores

9.3NEC CorporationCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
9.4JVNCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

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
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.

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Technologies

Your stack

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Your stack

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