CVE-2026-9429Public exploitNetwork attack vector

Authenticated code execution via unchecked sprintf

Published May 25, 2026 · Updated May 25, 2026

Stack-based buffer overflow in Tenda F1202 1.2.0.20(408) allows remote authenticated users to execute code via a crafted HTTP request. The referenced proof of concept identifies GO, rather than the CNA's delno parameter, as the value passed through sub_39978 to sprintf without a length check. Low-privilege access to the management endpoint is sufficient, and exploitation can crash httpd or execute code with the service's privileges.

CVSS severityUnavailable
Unscored
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Stack-based buffer overflow in Tenda F1202 1.2.0.20(408) allows remote authenticated users to execute code via a crafted HTTP request. The referenced proof of concept identifies GO, rather than the CNA's delno parameter, as the value passed through sub_39978 to sprintf without a length check. Low-privilege access to the management endpoint is sufficient, and exploitation can crash httpd or execute code with the service's privileges.

The record

CVE
CVE-2026-9429
Published
May 25, 2026
Updated
May 25, 2026
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
F1202
Classifications
CWE-121, CWE-119, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 25, 2026CVE publishedPublication date reported by the CVE source.
  2. May 25, 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=1.2.0.20(408)

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · F1202version=1.2.0.20(408)

Published CVSS scores

8.8VulDB CNACVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
9.0VulDB CNAAV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR
8.7VulDB CNACVSS: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
8.8VulDB CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R

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 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-121Stack-based Buffer Overflow
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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