CVE-2023-44021Public exploitNetwork attack vector

Unauthenticated code execution via unchecked sprintf

Published Sep 27, 2023 · Updated Sep 24, 2024

Stack overflow in Tenda AC10U 1.0 US_AC10UV1.0RTL_V15.03.06.49_multi_TDE01 allows remote attackers to crash httpd or execute code. The formSetClientState handler passes four request parameters, including limitSpeed, through sprintf into a fixed-size stack buffer without checking their lengths. No authentication or user interaction is required; a crafted POST to /goform/SetClientState can interrupt router management or run code with httpd privileges.

CVSS severity9.8
Critical
EPSS probability0.91%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack overflow in Tenda AC10U 1.0 US_AC10UV1.0RTL_V15.03.06.49_multi_TDE01 allows remote attackers to crash httpd or execute code. The formSetClientState handler passes four request parameters, including limitSpeed, through sprintf into a fixed-size stack buffer without checking their lengths. No authentication or user interaction is required; a crafted POST to /goform/SetClientState can interrupt router management or run code with httpd privileges.

The record

CVE
CVE-2023-44021
Published
Sep 27, 2023
Updated
Sep 24, 2024
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
AC10U
Classifications
CWE-119, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 27, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 2024Record 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=1.0 US_AC10UV1.0RTL_V15.03.06.49_multi_TDE01

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · AC10Uversion=1.0 US_AC10UV1.0RTL_V15.03.06.49_multi_TDE01

Published CVSS scores

9.8NVDCVSS: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
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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