CVE-2025-5600Public exploitNetwork attack vector

Unauthenticated memory corruption via LangType stack overflow

Published Jun 4, 2025 · Updated Jun 4, 2025

Stack-based buffer overflow in TOTOLINK EX1200T 4.1.2cu.5232_B20210713 allows remote attackers to corrupt memory via LangType. The setLanguageCfg function in /cgi-bin/cstecgi.cgi fails to bound LangType before the value overwrites its destination stack buffer. No authentication or user interaction is required; exploitation can crash the CGI process or redirect execution with the process's privileges.

CVSS severity9.3
Critical
EPSS probability1.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Stack-based buffer overflow in TOTOLINK EX1200T 4.1.2cu.5232_B20210713 allows remote attackers to corrupt memory via LangType. The setLanguageCfg function in /cgi-bin/cstecgi.cgi fails to bound LangType before the value overwrites its destination stack buffer. No authentication or user interaction is required; exploitation can crash the CGI process or redirect execution with the process's privileges.

The record

CVE
CVE-2025-5600
Published
Jun 4, 2025
Updated
Jun 4, 2025
Vendor
TOTOLINK
Product
EX1200T
Classifications
CWE-119, CWE-121, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 4, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

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 privilegesunauthenticated

What is affected?

TOTOLINK · EX1200Tversion=4.1.2cu.5232_B20210713

Published CVSS scores

10.0VulDBAV:N/AC:L/Au:N/C:C/I:C/A:C
9.8VulDBCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8VulDBCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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