CVE-2025-63466Public exploitNetwork attack vector

Unauthenticated router crash via oversized decoded password

Published Oct 31, 2025 · Updated Oct 31, 2025

Stack-based buffer overflow in TOTOLINK LR350 9.3.5u.6369_B20220309 allows remote attackers to crash the router via a crafted request. In sub_426EF8, urldecode writes the password byte by byte into a fixed 64-byte stack buffer without checking input length. No authentication or user interaction is required; a password longer than 63 bytes overwrites adjacent stack data and leaves routing services persistently unavailable.

CVSS severity7.5
High
EPSS probability0.39%
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 TOTOLINK LR350 9.3.5u.6369_B20220309 allows remote attackers to crash the router via a crafted request. In sub_426EF8, urldecode writes the password byte by byte into a fixed 64-byte stack buffer without checking input length. No authentication or user interaction is required; a password longer than 63 bytes overwrites adjacent stack data and leaves routing services persistently unavailable.

The record

CVE
CVE-2025-63466
Published
Oct 31, 2025
Updated
Oct 31, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-121, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 31, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 31, 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 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 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-121Stack-based Buffer Overflow
T1499Endpoint Denial of Service

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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