CVE-2025-11120Public exploitNetwork attack vectorHinoki check available

Authenticated device freeze via oversized POST parameter

Published Sep 28, 2025 · Updated Sep 28, 2025

Buffer overflow in Tenda AC8 16.03.34.06 allows remote authenticated users to freeze the router through a crafted POST request. The formSetServerConfig handler accepts an oversized HTTP/1.0 200 OK form value without a length check, and websDone overflows the stack while processing it. Low-privileged management access is sufficient; successful triggering drives CPU use to 100%, interrupts network service, and requires a physical restart.

CVSS severity8.8
High
EPSS probability3.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Buffer overflow in Tenda AC8 16.03.34.06 allows remote authenticated users to freeze the router through a crafted POST request. The formSetServerConfig handler accepts an oversized HTTP/1.0 200 OK form value without a length check, and websDone overflows the stack while processing it. Low-privileged management access is sufficient; successful triggering drives CPU use to 100%, interrupts network service, and requires a physical restart.

The record

CVE
CVE-2025-11120
Published
Sep 28, 2025
Updated
Sep 28, 2025
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
AC8
Classifications
CWE-120, CWE-119, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 28, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 28, 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=16.03.34.06

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · AC8version=16.03.34.06

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
9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C
8.8VulDBCVSS:3.1/AV:N/AC:L/PR:L/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 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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1499.004Application or System Exploitation

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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