CVE-2025-71023Public exploitNetwork attack vector

Persistent service crash via unchecked mac2 copy

Published Jan 13, 2026 · Updated Jan 13, 2026

Stack-based buffer overflow in Tenda AX-3 firmware 16.03.12.10_CN allows remote attackers to crash the router via a crafted HTTP request. The fromAdvSetMacMtuWan handler reads mac2 with websGetVar and passes it to strcpy for a fixed-size stack buffer without length checking. No authentication or user interaction is required, and the resulting memory corruption persistently interrupts routing services.

CVSS severity7.5
High
EPSS probability0.45%
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 AX-3 firmware 16.03.12.10_CN allows remote attackers to crash the router via a crafted HTTP request. The fromAdvSetMacMtuWan handler reads mac2 with websGetVar and passes it to strcpy for a fixed-size stack buffer without length checking. No authentication or user interaction is required, and the resulting memory corruption persistently interrupts routing services.

The record

CVE
CVE-2025-71023
Published
Jan 13, 2026
Updated
Jan 13, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-121, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 13, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
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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