CVE-2023-38940Public exploitNetwork attack vector

Remote code execution via unchecked SSID copy

Published Aug 7, 2023 · Updated Oct 11, 2024

A stack overflow in Tenda F1203, FH1203, and FH1205 firmware allows remote attackers to execute code via a crafted SSID request. The form_fast_setting_wifi_set handler in /bin/httpd passes the unbounded ssid value to strcpy, overflowing the acStack_d7 and acStack_97 buffers. The vulnerable HTTP endpoint requires no reported authentication, and exploitation can crash the router or execute attacker-controlled code.

CVSS severity9.8
Critical
EPSS probability0.84%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A stack overflow in Tenda F1203, FH1203, and FH1205 firmware allows remote attackers to execute code via a crafted SSID request. The form_fast_setting_wifi_set handler in /bin/httpd passes the unbounded ssid value to strcpy, overflowing the acStack_d7 and acStack_97 buffers. The vulnerable HTTP endpoint requires no reported authentication, and exploitation can crash the router or execute attacker-controlled code.

The record

CVE
CVE-2023-38940
Published
Aug 7, 2023
Updated
Oct 11, 2024
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
FH1203
Classifications
CWE-787, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 7, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 11, 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=V2.0.1.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · FH1203version=V2.0.1.6
Shenzhen Tenda Technology Co., Ltd. · F1203version=V2.0.1.6
Shenzhen Tenda Technology Co., Ltd. · FH1205version=V2.0.0.7(775)

Published CVSS scores

9.8NIST NVDCVSS: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.

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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 exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
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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