CVE-2026-4253Public exploitNetwork attack vector

Root command execution via unescaped policy destination

Published Mar 16, 2026 · Updated Mar 16, 2026

OS command injection in the Tenda AC8 16.03.50.11 web interface allows remote authenticated users to execute commands as root. route_set_user_policy_rule parses the wans.policy.list1 destination field and passes it unescaped through doSystemCmd to a shell-built iptables command. Administrative web access, an uploaded configuration, wans.policy.enable set to 1, and a reboot are required; the injected command then runs as root.

CVSS severity4.7
Medium
EPSS probability6.97%
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 the Tenda AC8 16.03.50.11 web interface allows remote authenticated users to execute commands as root. route_set_user_policy_rule parses the wans.policy.list1 destination field and passes it unescaped through doSystemCmd to a shell-built iptables command. Administrative web access, an uploaded configuration, wans.policy.enable set to 1, and a reboot are required; the injected command then runs as root.

The record

CVE
CVE-2026-4253
Published
Mar 16, 2026
Updated
Mar 16, 2026
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
AC8
Classifications
CWE-78, CWE-77, T1059.004
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Mar 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 16, 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=16.03.50.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Shenzhen Tenda Technology Co., Ltd. · AC8version=16.03.50.11

Published CVSS scores

2.0VulDBCVSS: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
5.8VulDBAV:N/AC:L/Au:M/C:P/I:P/A:P
7.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
4.7VulDBCVSS: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-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')
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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