CVE-2023-39827Public exploitNetwork attack vector

Unauthenticated stack overflow via rule_info

Published Aug 14, 2023 · Updated Oct 9, 2024

Stack overflow in Tenda A18 15.13.07.09 allows remote attackers to crash the network extender via a crafted HTTP request. The formAddMacfilterRule handler passes user-controlled deviceList data to parse_macfilter_rule, which copies it with strcpy into fixed-size rule_info fields without length checks. An attacker able to reach the management endpoint can interrupt service, and the published PoC reports root-shell execution with further exploit construction.

CVSS severity7.5
High
EPSS probability0.81%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack overflow in Tenda A18 15.13.07.09 allows remote attackers to crash the network extender via a crafted HTTP request. The formAddMacfilterRule handler passes user-controlled deviceList data to parse_macfilter_rule, which copies it with strcpy into fixed-size rule_info fields without length checks. An attacker able to reach the management endpoint can interrupt service, and the published PoC reports root-shell execution with further exploit construction.

The record

CVE
CVE-2023-39827
Published
Aug 14, 2023
Updated
Oct 9, 2024
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
A18
Classifications
CWE-787, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 9, 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=V15.13.07.09

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · A18version=V15.13.07.09

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
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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