CVE-2026-7413Public exploitNetwork attack vector

Root shell access via persistent FRP tunnel

Published May 7, 2026 · Updated May 7, 2026

Undocumented remote access in Yarbo Core Firmware 2.3.9 and earlier allows remote authenticated users to obtain a root shell. The com.yarbo.frpc Greengrass component maintains an outbound FRP tunnel that accepts unauthenticated serial-number routing to port 22, where sshd permits root login. A valid SSH username and password are required for this CVE alone; successful access permits arbitrary commands, telemetry access, and persistent control as root.

CVSS severity7.2
High
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Undocumented remote access in Yarbo Core Firmware 2.3.9 and earlier allows remote authenticated users to obtain a root shell. The com.yarbo.frpc Greengrass component maintains an outbound FRP tunnel that accepts unauthenticated serial-number routing to port 22, where sshd permits root login. A valid SSH username and password are required for this CVE alone; successful access permits arbitrary commands, telemetry access, and persistent control as root.

The record

CVE
CVE-2026-7413
Published
May 7, 2026
Updated
May 7, 2026
Vendor
Yarbo
Product
Yarbo Core Firmware
Classifications
CWE-912, CAPEC-133, CAPEC-190, T1021.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 7, 2026CVE publishedPublication date reported by the CVE source.
  2. May 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=2.3.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Yarbo · Yarbo Core Firmwareversion=0 <=2.3.9

Published CVSS scores

7.2Austin Hackers AnonymousCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
9.8NIST NVDCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitPublished

Weakness, pattern, technique

CWE-912Hidden Functionality
CAPEC-133Try All Common Switches
CAPEC-190Reverse Engineer an Executable to Expose Assumed Hidden Functionality
T1021.004Remote Services SSH

Public exploit references

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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