CVE-2025-27129Network attack vector

Unauthenticated code execution via empty Host header

Published Aug 20, 2025 · Updated Nov 3, 2025

Authentication bypass in Tenda AC6 V5.0 V02.03.01.110 allows remote attackers to execute arbitrary code via a crafted HTTP request. The http_auth_control_function treats an explicitly empty Host header as a null host and exits before checking the password or admin cookie. Unauthenticated network access to the TCP port 80 management portal grants full administrator control, including unsigned firmware flashing.

CVSS severity9.8
Critical
EPSS probability2.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Authentication bypass in Tenda AC6 V5.0 V02.03.01.110 allows remote attackers to execute arbitrary code via a crafted HTTP request. The http_auth_control_function treats an explicitly empty Host header as a null host and exits before checking the password or admin cookie. Unauthenticated network access to the TCP port 80 management portal grants full administrator control, including unsigned firmware flashing.

The record

CVE
CVE-2025-27129
Published
Aug 20, 2025
Updated
Nov 3, 2025
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
AC6
Classifications
CWE-288, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 20, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record 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=V02.03.01.110

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · AC6version=V02.03.01.110

Published CVSS scores

9.8Cisco TalosCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-288Authentication Bypass Using an Alternate Path or Channel
T1190Exploit Public-Facing Application

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo