CVE-2026-31985Network attack vector

Upstream impersonation via disabled TLS verification

Published Jul 9, 2026 · Updated Jul 9, 2026

Improper TLS certificate validation in Nozomi Networks Remote Collector before 26.2.0 allows man-in-the-middle attackers to intercept sync traffic. The n2os-tui workflow writes the upstream Guardian or CMC endpoint into n2os.conf.user with an exclamation-point prefix that disables certificate verification and exposes no setting to enable it. Exploitation requires a network position between the collector and its upstream system and enables sync-token theft, server impersonation, spoofed-data injection, or data-flow interruption.

CVSS severity8.3
High
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper TLS certificate validation in Nozomi Networks Remote Collector before 26.2.0 allows man-in-the-middle attackers to intercept sync traffic. The n2os-tui workflow writes the upstream Guardian or CMC endpoint into n2os.conf.user with an exclamation-point prefix that disables certificate verification and exposes no setting to enable it. Exploitation requires a network position between the collector and its upstream system and enables sync-token theft, server impersonation, spoofed-data injection, or data-flow interruption.

The record

CVE
CVE-2026-31985
Published
Jul 9, 2026
Updated
Jul 9, 2026
Vendor
Nozomi Networks
Product
Remote Collector
Classifications
CWE-671, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 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=0 <26.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Nozomi Networks · Remote Collectorversion=0 <26.2.0

Published CVSS scores

8.3Nozomi Networks Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:L/SC:L/SI:L/SA:N
8.1Nozomi Networks Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/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-671Lack of Administrator Control over Security
T1557Adversary-in-the-Middle

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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