CVE-2025-45865Public exploitNetwork attack vector

Authenticated service crash via unchecked dnsaddr copy

Published May 13, 2025 · Updated May 14, 2025

Buffer overflow in TOTOLINK A3002R firmware 4.0.0-B20230531.1404 allows remote authenticated users to crash the Boa service. In formDhcpv6s, FUN_00451dc8 passes the POST-supplied dnsaddr value to strcpy without checking its length, overwriting the destination buffer. Triggering requires a valid sessionCheck value plus wan_enable=1 and enable_dhcpv6s=1; the demonstrated consequence is termination of the Boa process.

CVSS severity9.8
Critical
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in TOTOLINK A3002R firmware 4.0.0-B20230531.1404 allows remote authenticated users to crash the Boa service. In formDhcpv6s, FUN_00451dc8 passes the POST-supplied dnsaddr value to strcpy without checking its length, overwriting the destination buffer. Triggering requires a valid sessionCheck value plus wan_enable=1 and enable_dhcpv6s=1; the demonstrated consequence is termination of the Boa process.

The record

CVE
CVE-2025-45865
Published
May 13, 2025
Updated
May 14, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 13, 2025CVE publishedPublication date reported by the CVE source.
  2. May 14, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic 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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