CVE-2025-6302Public exploitNetwork attack vector

Authenticated device compromise via DHCP comment overflow

Published Jun 20, 2025 · Updated Jun 20, 2025

Stack-based buffer overflow in TOTOLINK EX1200T 4.1.2cu.5232_B20210713 allows remote authenticated users to compromise the device. The setStaticDhcpConfig function in /cgi-bin/cstecgi.cgi mishandles an oversized Comment request value and overwrites stack memory. A valid low-privilege session is required; successful exploitation affects device confidentiality, integrity, and availability.

CVSS severity8.8
High
EPSS probability0.89%
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 EX1200T 4.1.2cu.5232_B20210713 allows remote authenticated users to compromise the device. The setStaticDhcpConfig function in /cgi-bin/cstecgi.cgi mishandles an oversized Comment request value and overwrites stack memory. A valid low-privilege session is required; successful exploitation affects device confidentiality, integrity, and availability.

The record

CVE
CVE-2025-6302
Published
Jun 20, 2025
Updated
Jun 20, 2025
Vendor
TOTOLINK
Product
EX1200T
Classifications
CWE-121, CWE-119, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 20, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 20, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.1.2cu.5232_B20210713

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

TOTOLINK · EX1200Tversion=4.1.2cu.5232_B20210713

Published CVSS scores

8.7VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C
8.8VulDBCVSS:3.1/AV:N/AC:L/PR:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1190Exploit Public-Facing Application

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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