CVE-2025-45866Public exploit

Boa process crash via unchecked addrPoolEnd copy

Published May 13, 2025 · Updated May 14, 2025

A buffer overflow in TOTOLINK A3002R 4.0.0-B20230531.1404 allows adjacent-network attackers to crash Boa via a crafted DHCPv6 request. The formDhcpv6s handler passes the attacker-controlled addrPoolEnd POST value to strcpy without checking its length against the destination buffer. The demonstrated request sets wan_enable and enable_dhcpv6s to 1 and carries a sessionCheck value; only a Boa process crash is established.

CVSS severity5.4
Medium
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A buffer overflow in TOTOLINK A3002R 4.0.0-B20230531.1404 allows adjacent-network attackers to crash Boa via a crafted DHCPv6 request. The formDhcpv6s handler passes the attacker-controlled addrPoolEnd POST value to strcpy without checking its length against the destination buffer. The demonstrated request sets wan_enable and enable_dhcpv6s to 1 and carries a sessionCheck value; only a Boa process crash is established.

The record

CVE
CVE-2025-45866
Published
May 13, 2025
Updated
May 14, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1499
Attack vector
adjacent
Privileges
unauthenticated

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 vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.4CISA-ADPCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

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)
Vectoradjacent
Privilegesunauthenticated
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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