CVE-2026-4567Public exploitNetwork attack vector

Unauthenticated code execution via UploadCfg overflow

Published Mar 23, 2026 · Updated Mar 23, 2026

Stack-based buffer overflow in Tenda A15 15.13.07.13 allows remote attackers to execute arbitrary code through a crafted File upload. The UploadCfg handler at /cgi-bin/UploadCfg processes the File argument without enforcing the destination stack buffer's bounds, overwriting adjacent stack memory. No authentication or user interaction is required, and successful exploitation can take control of the repeater.

CVSS severity9.8
Critical
EPSS probability3.69%
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 A15 15.13.07.13 allows remote attackers to execute arbitrary code through a crafted File upload. The UploadCfg handler at /cgi-bin/UploadCfg processes the File argument without enforcing the destination stack buffer's bounds, overwriting adjacent stack memory. No authentication or user interaction is required, and successful exploitation can take control of the repeater.

The record

CVE
CVE-2026-4567
Published
Mar 23, 2026
Updated
Mar 23, 2026
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
A15
Classifications
CWE-121, CWE-119, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 23, 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=15.13.07.13

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · A15version=15.13.07.13

Published CVSS scores

9.8VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.9VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/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.

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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
Privilegesunauthenticated
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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