CVE-2025-63459Public exploitNetwork attack vector

Service crash via unbounded ssid5g URL decoding

Published Oct 31, 2025 · Updated Oct 31, 2025

Stack overflow in TOTOLINK A7000R firmware 9.1.0u.6115_B20201022 allows remote attackers to crash the router via a crafted request. The linked analysis identifies sub_422C30, where urldecode writes an unbounded decoded ssid5g value into a 128-byte stack buffer, while the CVE record names sub_421CF0. No authentication or user interaction is required; oversized input overwrites adjacent stack data or the return address 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 overflow in TOTOLINK A7000R firmware 9.1.0u.6115_B20201022 allows remote attackers to crash the router via a crafted request. The linked analysis identifies sub_422C30, where urldecode writes an unbounded decoded ssid5g value into a 128-byte stack buffer, while the CVE record names sub_421CF0. No authentication or user interaction is required; oversized input overwrites adjacent stack data or the return address and leaves routing services persistently unavailable.

The record

CVE
CVE-2025-63459
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 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
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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