CVE-2026-5685Public exploitNetwork attack vector

Web-service crash via oversized page parameter

Published Apr 6, 2026 · Updated Apr 6, 2026

Stack-based buffer overflow in Tenda CX12L 16.03.53.12 allows attackers to crash its web service via a crafted page parameter. The fromAddressNat function passes the user-controlled page value to sprintf, which writes more than 256 bytes into a fixed-size stack buffer without a length check. The published PoC states that authentication is unnecessary, although the CNA's CVSS vectors require low privileges; the demonstrated consequence is a web-service crash.

CVSS severity8.8
High
EPSS probability0.69%
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 CX12L 16.03.53.12 allows attackers to crash its web service via a crafted page parameter. The fromAddressNat function passes the user-controlled page value to sprintf, which writes more than 256 bytes into a fixed-size stack buffer without a length check. The published PoC states that authentication is unnecessary, although the CNA's CVSS vectors require low privileges; the demonstrated consequence is a web-service crash.

The record

CVE
CVE-2026-5685
Published
Apr 6, 2026
Updated
Apr 6, 2026
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
CX12L
Classifications
CWE-121, CWE-119, T1190
Attack vector
network
Privileges
Unavailable

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 vectornetwork
Required privilegesUnavailable in this record.

What is affected?

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

Published CVSS scores

8.8VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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

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
PrivilegesUnavailable
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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