CVE-2026-5339Public exploitNetwork attack vector

Authenticated root command execution via unsanitized GPON setting

Published Apr 2, 2026 · Updated Apr 2, 2026

Command injection in Tenda G103 1.0.0.5 allows remote authenticated users to execute arbitrary system commands through GPON settings. The action_set_net_settings function in gpon.lua concatenates the authLoid value into fw_setenv and uci shell commands without validation or escaping. A valid administrative session token and cookies reach the handler, after which shell metacharacters execute commands with root privileges and permit device takeover.

CVSS severity8.8
High
EPSS probability6.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in Tenda G103 1.0.0.5 allows remote authenticated users to execute arbitrary system commands through GPON settings. The action_set_net_settings function in gpon.lua concatenates the authLoid value into fw_setenv and uci shell commands without validation or escaping. A valid administrative session token and cookies reach the handler, after which shell metacharacters execute commands with root privileges and permit device takeover.

The record

CVE
CVE-2026-5339
Published
Apr 2, 2026
Updated
Apr 2, 2026
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
G103
Classifications
CWE-77, CWE-74, T1059.004
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 2, 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=1.0.0.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Shenzhen Tenda Technology Co., Ltd. · G103version=1.0.0.5

Published CVSS scores

5.8VulDB CNAAV:N/AC:L/Au:M/C:P/I:P/A:P
2.0VulDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.7VulDB CNACVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/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.

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
T1059.004Unix 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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