CVE-2025-27019Network attack vector

Unauthenticated system access via passwordless RSH accounts

Published Dec 8, 2025 · Updated Dec 8, 2025

Missing authentication in Infinera MTC-9 R22.1.1.0275 allows remote attackers to gain system access through the RSH service. The RSH service accepts passwordless user accounts and permits activation of a reverse shell instead of requiring identity verification. Network reachability to RSH is sufficient; successful exploitation provides command-capable access to the appliance.

CVSS severity9.8
Critical
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in Infinera MTC-9 R22.1.1.0275 allows remote attackers to gain system access through the RSH service. The RSH service accepts passwordless user accounts and permits activation of a reverse shell instead of requiring identity verification. Network reachability to RSH is sufficient; successful exploitation provides command-capable access to the appliance.

The record

CVE
CVE-2025-27019
Published
Dec 8, 2025
Updated
Dec 8, 2025
Vendor
Infinera
Product
MTC-9
Classifications
CWE-306, T1078
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 8, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 8, 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=R22.1.1.0275 <R23.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Infinera · MTC-9version=R22.1.1.0275 <R23.0

Published CVSS scores

9.8ENISACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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