CVE-2025-45859Public exploit

Web process crash via unchecked sprintf

Published May 13, 2025 · Updated May 14, 2025

Buffer overflow in TOTOLINK A3002R 4.0.0-B20230531.1404 allows remote authenticated users to crash the Boa web process via bandstr. FUN_0045a1f8 passes the POST-supplied bandstr value to sprintf without a length check, overflowing its destination buffer. The demonstrated request requires a valid sessionCheck value and clientoff=no; its bounded demonstrated consequence is termination of the router web process.

CVSS severity5.4
Medium
EPSS probability5.00%
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 4.0.0-B20230531.1404 allows remote authenticated users to crash the Boa web process via bandstr. FUN_0045a1f8 passes the POST-supplied bandstr value to sprintf without a length check, overflowing its destination buffer. The demonstrated request requires a valid sessionCheck value and clientoff=no; its bounded demonstrated consequence is termination of the router web process.

The record

CVE
CVE-2025-45859
Published
May 13, 2025
Updated
May 14, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1499.004
Attack vector
adjacent
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 vectoradjacent
Required privilegesauthenticated

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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