CVE-2025-9046Public exploitNetwork attack vector

Authenticated code execution via unbounded deviceList copies

Published Aug 15, 2025 · Updated Aug 15, 2025

Stack-based buffer overflow in Tenda AC20 16.03.08.12 allows remote authenticated users to execute code through a crafted deviceList. The /goform/setMacFilterCfg handler passes newline-delimited deviceList entries through sub_46A2AC to sub_46BC10, where two strcpy calls copy attacker-controlled name and MAC fields into a fixed-size stack buffer without length checks. Access to the web-management endpoint requires an authenticated session, and successful exploitation can corrupt control data, execute code, or crash the router.

CVSS severity8.8
High
EPSS probability0.82%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Tenda AC20 16.03.08.12 allows remote authenticated users to execute code through a crafted deviceList. The /goform/setMacFilterCfg handler passes newline-delimited deviceList entries through sub_46A2AC to sub_46BC10, where two strcpy calls copy attacker-controlled name and MAC fields into a fixed-size stack buffer without length checks. Access to the web-management endpoint requires an authenticated session, and successful exploitation can corrupt control data, execute code, or crash the router.

The record

CVE
CVE-2025-9046
Published
Aug 15, 2025
Updated
Aug 15, 2025
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
AC20
Classifications
CWE-119, CWE-121, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2025Record 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=16.03.08.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · AC20version=16.03.08.12

Published CVSS scores

7.4VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
8.8VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C

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 exploitPublished

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-121Stack-based Buffer Overflow
T1190Exploit Public-Facing Application

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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