CVE-2025-28135Public exploitNetwork attack vector

Unauthenticated service interruption via unchecked CGI copy

Published Mar 27, 2025 · Updated Apr 15, 2025

Stack-based buffer overflow in TOTOLINK A810R 4.1.2cu.5182_B20201026 allows remote attackers to interrupt router service via an HTTP request. The downloadFile.cgi handler copies user-controlled v5 data derived through v14 into the v27 stack buffer without length validation; a final payload segment longer than 132 bytes overflows it. No authentication or user interaction is required, and the published assessment limits demonstrated impact to a remotely triggered service interruption.

CVSS severity7.5
High
EPSS probability0.53%
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 TOTOLINK A810R 4.1.2cu.5182_B20201026 allows remote attackers to interrupt router service via an HTTP request. The downloadFile.cgi handler copies user-controlled v5 data derived through v14 into the v27 stack buffer without length validation; a final payload segment longer than 132 bytes overflows it. No authentication or user interaction is required, and the published assessment limits demonstrated impact to a remotely triggered service interruption.

The record

CVE
CVE-2025-28135
Published
Mar 27, 2025
Updated
Apr 15, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-121, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 27, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 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
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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