CVE-2026-7054Public exploitNetwork attack vector

Authenticated code execution via unchecked sprintf

Published Apr 26, 2026 · Updated Apr 26, 2026

Stack buffer overflow in Tenda F456 Firmware 1.0.0.5 allows remote authenticated users to execute code via a crafted PPTP client request. The fromPptpUserAdd handler passes the user-supplied username to sprintf without a length check when opttype is 1, overflowing stack buffer s__3. Low-privilege access to the httpd endpoint is required; exploitation can crash the service or execute code in the httpd process.

CVSS severityUnavailable
Unscored
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in Tenda F456 Firmware 1.0.0.5 allows remote authenticated users to execute code via a crafted PPTP client request. The fromPptpUserAdd handler passes the user-supplied username to sprintf without a length check when opttype is 1, overflowing stack buffer s__3. Low-privilege access to the httpd endpoint is required; exploitation can crash the service or execute code in the httpd process.

The record

CVE
CVE-2026-7054
Published
Apr 26, 2026
Updated
Apr 26, 2026
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
F456 Firmware
Classifications
CWE-119, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 26, 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=1.0.0.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · F456 Firmwareversion=1.0.0.5

Published CVSS scores

7.4INCIBE-CERTCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
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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