CVE-2023-27042Public exploitNetwork attack vector

Authenticated crash via unchecked firewall input copy

Published Mar 24, 2023 · Updated Feb 20, 2025

Stack-based buffer overflow in Tenda AX3 firmware 16.03.12.11 allows remote authenticated users to crash the router via firewallEn. The /goform/SetFirewallCfg handler passes an oversized firewallEn value to strcpy for storage in firewall_buf without checking the destination size. Access to the router management interface is required; the published request crashes the router, while root-shell execution is reported but not demonstrated.

CVSS severity8.8
High
EPSS probability0.90%
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 AX3 firmware 16.03.12.11 allows remote authenticated users to crash the router via firewallEn. The /goform/SetFirewallCfg handler passes an oversized firewallEn value to strcpy for storage in firewall_buf without checking the destination size. Access to the router management interface is required; the published request crashes the router, while root-shell execution is reported but not demonstrated.

The record

CVE
CVE-2023-27042
Published
Mar 24, 2023
Updated
Feb 20, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1210
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 24, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 20, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8CISA-ADPCVSS: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.

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-787Out-of-bounds Write
T1210Exploitation of Remote Services

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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