CVE-2026-5683Public exploit

Unauthenticated code execution via oversized page parameter

Published Apr 6, 2026 · Updated Apr 6, 2026

Stack-based buffer overflow in Tenda CX12L 16.03.53.12 allows remote attackers to crash its web service or execute code via the page parameter. The fromP2pListFilter function passes the user-controlled value to sprintf, which writes it into a fixed 256-byte stack buffer without a length check. Exploitation requires adjacent-network access; despite CVSS assessments requiring low privileges, the public proof of concept reaches the endpoint without authentication and demonstrates the overflow trigger, not code execution.

CVSS severity8.0
High
EPSS probability0.62%
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 CX12L 16.03.53.12 allows remote attackers to crash its web service or execute code via the page parameter. The fromP2pListFilter function passes the user-controlled value to sprintf, which writes it into a fixed 256-byte stack buffer without a length check. Exploitation requires adjacent-network access; despite CVSS assessments requiring low privileges, the public proof of concept reaches the endpoint without authentication and demonstrates the overflow trigger, not code execution.

The record

CVE
CVE-2026-5683
Published
Apr 6, 2026
Updated
Apr 6, 2026
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
CX12L
Classifications
CWE-119, CWE-121, T1190
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 6, 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=16.03.53.12

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · CX12Lversion=16.03.53.12

Published CVSS scores

2.0VulDBCVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
5.2VulDBAV:A/AC:L/Au:S/C:P/I:P/A:P
8.0NVDCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5VulDBCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-121Stack-based Buffer Overflow
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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