CVE-2025-63457Public exploit

Service crash via unchecked wanMTU copy

Published Nov 10, 2025 · Updated Nov 18, 2025

Stack-based buffer overflow in Tenda AX-1803 1.0.0.1 allows remote attackers to crash the router via a crafted wanMTU request. The fromAdvSetMacMtuWan handler obtains wanMTU through sub_4F55C and copies it with strcpy into the fixed-size v9 stack buffer without checking its length. No authentication or user interaction is required; an oversized parameter persistently interrupts router service rather than disclosing or altering data.

CVSS severity7.5
High
EPSS probability0.37%
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-1803 1.0.0.1 allows remote attackers to crash the router via a crafted wanMTU request. The fromAdvSetMacMtuWan handler obtains wanMTU through sub_4F55C and copies it with strcpy into the fixed-size v9 stack buffer without checking its length. No authentication or user interaction is required; an oversized parameter persistently interrupts router service rather than disclosing or altering data.

The record

CVE
CVE-2025-63457
Published
Nov 10, 2025
Updated
Nov 18, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-121, CWE-787, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 10, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 18, 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 vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

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