CVE-2025-63835Public exploit

Device crash via oversized guestSsid value

Published Nov 10, 2025 · Updated Nov 10, 2025

Stack-based buffer overflow in Tenda AC18 15.03.05.05_multi allows remote attackers to crash the device through a crafted guest SSID. The /goform/WifiGuestSet handler accepts an oversized guestSsid value into stack-backed storage without enforcing the destination capacity. CISA assesses adjacent, unauthenticated reachability, while NVD assesses network access with low privileges; the demonstrated consequence is a device crash.

CVSS severity8.8
High
EPSS probability0.65%
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 AC18 15.03.05.05_multi allows remote attackers to crash the device through a crafted guest SSID. The /goform/WifiGuestSet handler accepts an oversized guestSsid value into stack-backed storage without enforcing the destination capacity. CISA assesses adjacent, unauthenticated reachability, while NVD assesses network access with low privileges; the demonstrated consequence is a device crash.

The record

CVE
CVE-2025-63835
Published
Nov 10, 2025
Updated
Nov 10, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-121, CWE-787, T1499.004
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Nov 10, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 10, 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 vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5CISA-ADPCVSS:3.1/AV:A/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-787Out-of-bounds Write
T1499.004Endpoint Denial of Service: Application 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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