CVE-2026-19982Network attack vector

Root command execution via newline-tainted firewall fields

Published Aug 17, 2026 · Updated Aug 18, 2026

OS command injection in GL.iNet BE9300 and MT6000 firmware 4.8.x allows remote authenticated users to execute commands as root. The firewall-management RPC accepts newline characters in dest_ip and dest_port values, then concatenates them into conntrack cleanup commands. Administrative access to the router interface is required; exploitation permits root-level file access, persistent configuration changes, and network pivoting.

CVSS severity5.3
Medium
EPSS probability1.05%
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 GL.iNet BE9300 and MT6000 firmware 4.8.x allows remote authenticated users to execute commands as root. The firewall-management RPC accepts newline characters in dest_ip and dest_port values, then concatenates them into conntrack cleanup commands. Administrative access to the router interface is required; exploitation permits root-level file access, persistent configuration changes, and network pivoting.

The record

CVE
CVE-2026-19982
Published
Aug 17, 2026
Updated
Aug 18, 2026
Vendor
GL.iNet
Product
MT6000
Classifications
CWE-78, CWE-77, CAPEC-88, CAPEC-15, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 18, 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=4.8.*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GL.iNet · MT6000version=4.8.*
GL.iNet · BE9300version=4.8.*

Published CVSS scores

5.3VulDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:X
7.4NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L
6.5NVDAV:N/AC:L/Au:S/C:P/I:P/A:P

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
CAPEC-88OS Command Injection
CAPEC-15Command Delimiters
T1059.004Unix Shell

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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