CVE-2026-4490Public exploitNetwork attack vector

Authenticated service crash via unbounded schedule copies

Published Mar 20, 2026 · Updated Mar 20, 2026

Heap buffer overflow in Tenda A18 Pro 02.03.02.28 allows remote authenticated users to crash its web management interface. The setSchedWifi function copies schedStartTime and schedEndTime into offsets within a 25-byte heap allocation using strcpy without length checks. An authenticated management session is required; an oversized schedule value corrupts heap memory and can stop the device's HTTP service.

CVSS severity8.8
High
EPSS probability0.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in Tenda A18 Pro 02.03.02.28 allows remote authenticated users to crash its web management interface. The setSchedWifi function copies schedStartTime and schedEndTime into offsets within a 25-byte heap allocation using strcpy without length checks. An authenticated management session is required; an oversized schedule value corrupts heap memory and can stop the device's HTTP service.

The record

CVE
CVE-2026-4490
Published
Mar 20, 2026
Updated
Mar 20, 2026
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
A18 Pro
Classifications
CWE-121, CWE-119, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 20, 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=02.03.02.28

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · A18 Proversion=02.03.02.28

Published CVSS scores

9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C
8.8VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 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
T1499.004Application or System Exploitation

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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