CVE-2025-71021Public exploitNetwork attack vector

Unauthenticated service crash via unchecked serverName copy

Published Jan 14, 2026 · Updated Jan 14, 2026

Stack-based buffer overflow in Tenda AX-1806 1.0.0.1 allows remote attackers to crash the router web service via a crafted HTTP request. The sub_65A28 function copies the user-controlled serverName value into a 128-byte stack buffer with strcpy and no length check. No authentication or user interaction is required; an oversized POST to /goform/AdvSetMacMtuWan corrupts stack memory and interrupts router service.

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-1806 1.0.0.1 allows remote attackers to crash the router web service via a crafted HTTP request. The sub_65A28 function copies the user-controlled serverName value into a 128-byte stack buffer with strcpy and no length check. No authentication or user interaction is required; an oversized POST to /goform/AdvSetMacMtuWan corrupts stack memory and interrupts router service.

The record

CVE
CVE-2025-71021
Published
Jan 14, 2026
Updated
Jan 14, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-121, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 14, 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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