CVE-2025-63462Public exploitNetwork attack vector

Router crash via unbounded SSID decoding

Published Oct 31, 2025 · Updated Oct 31, 2025

Stack-based buffer overflow in TOTOLINK A7000R firmware 9.1.0u.6115_B20201022 allows remote attackers to crash the router. In sub_421A04, wifiOff set to 0 sends an overlong ssid value to urldecode, which writes decoded bytes into a fixed 128-byte stack buffer without a length bound. A crafted network request requires no authentication and leaves the router persistently unable to provide services.

CVSS severity7.5
High
EPSS probability0.39%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in TOTOLINK A7000R firmware 9.1.0u.6115_B20201022 allows remote attackers to crash the router. In sub_421A04, wifiOff set to 0 sends an overlong ssid value to urldecode, which writes decoded bytes into a fixed 128-byte stack buffer without a length bound. A crafted network request requires no authentication and leaves the router persistently unable to provide services.

The record

CVE
CVE-2025-63462
Published
Oct 31, 2025
Updated
Oct 31, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-121, T1499.004
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 11, 2026Sep 17, 2026
Latest reporting daySep 17, 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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