CVE-2024-4248Network attack vector

Memory corruption via unchecked ssidIndex stack write

Published Apr 27, 2024 · Updated Aug 1, 2024

Stack-based buffer overflow in Tenda i21 1.0.0.14(4656) allows remote authenticated users to corrupt memory through ssidIndex. The formQosManage_user handler processes an oversized ssidIndex value without enforcing the destination stack buffer's bounds. Low-privileged management access is required; successful exploitation can crash the service or alter its execution.

CVSS severity8.8
High
EPSS probability1.35%
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 i21 1.0.0.14(4656) allows remote authenticated users to corrupt memory through ssidIndex. The formQosManage_user handler processes an oversized ssidIndex value without enforcing the destination stack buffer's bounds. Low-privileged management access is required; successful exploitation can crash the service or alter its execution.

The record

CVE
CVE-2024-4248
Published
Apr 27, 2024
Updated
Aug 1, 2024
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
Tenda i21 Firmware
Classifications
CWE-787, CWE-121
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 27, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 2024Record 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=1.0.0.14\(4656\)

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · Tenda i21 Firmwareversion=1.0.0.14\(4656\)
Shenzhen Tenda Technology Co., Ltd. · i21version=1.0.0.14(4656)

Published CVSS scores

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

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-121Stack-based Buffer Overflow

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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