CVE-2026-4492Public exploitNetwork attack vector

Code execution via unchecked QoS parameter copy

Published Mar 20, 2026 · Updated Mar 20, 2026

Stack-based buffer overflow in Tenda A18 Pro 02.03.02.28 allows remote authenticated users to execute code via a crafted QoS request. The set_qosMib_list function copies the user-controlled list parameter with strcpy into a 256-byte qos_str stack buffer without checking its length. Low-privileged management access is required; exploitation can crash the httpd service or overwrite its return address for code execution.

CVSS severity8.8
High
EPSS probability0.64%
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 A18 Pro 02.03.02.28 allows remote authenticated users to execute code via a crafted QoS request. The set_qosMib_list function copies the user-controlled list parameter with strcpy into a 256-byte qos_str stack buffer without checking its length. Low-privileged management access is required; exploitation can crash the httpd service or overwrite its return address for code execution.

The record

CVE
CVE-2026-4492
Published
Mar 20, 2026
Updated
Mar 20, 2026
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
A18 Pro
Classifications
CWE-119, CWE-121, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 20, 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=02.03.02.28

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · A18 Proversion=02.03.02.28

Published CVSS scores

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
7.4NVDCVSS: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

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-119Memory Corruption
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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