CVE-2026-27848Public exploitNetwork attack vector

Unauthenticated root command execution via TLS-SRP username

Published Feb 25, 2026 · Updated Feb 25, 2026

OS command injection in Linksys MR9600 1.0.4.205530 and MX4200 1.0.13.210200 allows remote attackers to execute commands as root. The sct_server service on TCP port 6060 passes the TLS-SRP username to smcdb_auth as an unneutralized command-line argument. The service listens on every interface except WAN, and no valid username or password is required, so access to a non-WAN network grants root-level command execution.

CVSS severity9.8
Critical
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in Linksys MR9600 1.0.4.205530 and MX4200 1.0.13.210200 allows remote attackers to execute commands as root. The sct_server service on TCP port 6060 passes the TLS-SRP username to smcdb_auth as an unneutralized command-line argument. The service listens on every interface except WAN, and no valid username or password is required, so access to a non-WAN network grants root-level command execution.

The record

CVE
CVE-2026-27848
Published
Feb 25, 2026
Updated
Feb 25, 2026
Vendor
Linksys
Product
MX4200
Classifications
CWE-78, CAPEC-88, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 25, 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=1.0.13.210200

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Linksys · MX4200version=1.0.13.210200
Linksys · MR9600version=1.0.4.205530

Published CVSS scores

9.8CISA-ADPCVSS: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 exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CAPEC-88OS Command Injection
T1059.004Command and Scripting Interpreter: Unix Shell

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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