CVE-2026-2907Public exploitNetwork attack vector

Authenticated code execution via unbounded sprintf

Published Feb 22, 2026 · Updated Feb 22, 2026

Stack-based buffer overflow in Tenda HG9 firmware 300001138 allows remote authenticated users to execute code through GPON settings. The formgponConf function formats the fmgpon_loid and fmgpon_loid_password parameters with unbounded sprintf calls into a 128-byte stack buffer. Low-privilege web access is required; oversized values overwrite control data, crash the HTTP service, or execute code with the web server's privileges.

CVSS severity8.8
High
EPSS probability0.56%
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 HG9 firmware 300001138 allows remote authenticated users to execute code through GPON settings. The formgponConf function formats the fmgpon_loid and fmgpon_loid_password parameters with unbounded sprintf calls into a 128-byte stack buffer. Low-privilege web access is required; oversized values overwrite control data, crash the HTTP service, or execute code with the web server's privileges.

The record

CVE
CVE-2026-2907
Published
Feb 22, 2026
Updated
Feb 22, 2026
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
HG9
Classifications
CWE-121, CWE-119, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 22, 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=300001138

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · HG9version=300001138

Published CVSS scores

9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C
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
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-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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